Month: November 2021

An article Syntheses and pH-responsive emissions of pyrid-2-yl-appended para-phenylene oligomers WOS:000590766600010 published article about AGGREGATION-INDUCED EMISSION; H BOND ACTIVATION; DIRECT ARYLATION; CONJUGATED POLYMERS; LUMINESCENCE; DERIVATIVES; MOLECULES; EFFICIENT; AIEGENS; META in [He, Yan-Qin; Tang, Jian-Hong; Li, Zhong-Qiu; Zhong, Yu-Wu] Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, Beijing Natl Lab Mol Sci,CAS Key Lab Photochem, Beijing 100190, Peoples R China; [He, Yan-Qin] Liaocheng Univ, Inst BioPharmaceut Res, 1 Hunan Rd, Liaocheng 252000, Shandong, Peoples R China; [Li, Zhong-Qiu; Zhong, Yu-Wu] Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China in 2020, Cited 62. The Name is 4,4′-Dibromobiphenyl. Through research, I have a further understanding and discovery of 92-86-4. Recommanded Product: 4,4′-Dibromobiphenyl

The synthesis of 7-conjugated organic materials through C-H activation and functionalization has recently received increasing attention. In this work, four pyrid-2-yl-appended para-phenylene oligomers (1-4) with two to five phenyl repeating units were synthesized via the Ru-catalyzed C-H activation of 2-phenylpyridine, followed by oxidative homocoupling or the arylation with a para-phenylene dibromide substrate. The single-crystal X-ray data and crystal packing of 1 and 3 are presented. In response to acid stimuli, the blue emissions of 1-3 are replaced by red-shifted cyan emissions, which are associated with the charge transfer transition from the phenylene backbone to the protonated pyridinium units. However, the emission of the longest congener 4 is largely quenched upon protonation. This lengthdependent emission property is rationalized by DFT and TDDFT calculations. (C) 2020 Elsevier Ltd. All rights reserved.

About 4,4′-Dibromobiphenyl, If you have any questions, you can contact He, YQ; Tang, JH; Li, ZQ; Zhong, YW or concate me.. Recommanded Product: 4,4′-Dibromobiphenyl

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

An article Effect of Purification Solvent on Polymer Impurities and Device Performance WOS:000480672700021 published article about MICROWAVE-ASSISTED POLYCONDENSATION; LIGHT-EMITTING-DIODES; ELECTROLUMINESCENCE; OXIDATION; PURE in [Kodama, Shunsuke] Hitachi Chem Co Ltd, Adv Technol Res & Dev Ctr Shimodate, 1919 Morisoejima, Chikusei City, Ibaraki 3080861, Japan; [Kuwabara, Junpei; Jiang, Xin; Kanbara, Takaki] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba Res Ctr Energy Mat Sci TREMS, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058573, Japan; [Fukushima, Iori] Hitachi Chem Co Ltd, Adv Technol Res & Dev Ctr, 48 Wadai, Tsukuba, Ibaraki 3004247, Japan in 2019, Cited 31. The Name is 4,4′-Dibromobiphenyl. Through research, I have a further understanding and discovery of 92-86-4. Product Details of 92-86-4

Poly(arylamine)s were synthesized by poly-condensation of 4-n-octylaniline with 4,4′-dibromobiphenyl using the Buchwald-Hartwig aryl amination. Both the NH and the Br end groups were properly modified upon addition of an end-capping reagent in an appropriate ratio. The synthesized polymers contained many impurities, such as Pd, Br, and Cl, which decrease organic light-emitting diode performance. An investigation to reduce the impurities in the polymer showed that the purification solvent plays the key role in reducing the concentration of impurities in the polymer; purification with a nonchlorinated solvent, anisole, provided a highly pure poly(arylamine) even with a simple purification procedure. Moreover, the highly purified polymer material improved carrier mobility in hole-only devices.

Product Details of 92-86-4. About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Kodama, S; Kuwabara, J; Jiang, X; Fukushima, I; Kanbara, T or concate me.

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

Safety of 4,4′-Dibromobiphenyl. I found the field of Environmental Sciences & Ecology very interesting. Saw the article Previously identified and unidentified polybrominated biphenyl congeners in serum from people living in an electronic waste dismantling area in China published in 2021, Reprint Addresses Jin, J (corresponding author), Minzu Univ China, Coll Life & Environm Sci, Beijing 100081, Peoples R China.; Wei, YJ (corresponding author), Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China.. The CAS is 92-86-4. Through research, I have a further understanding and discovery of 4,4′-Dibromobiphenyl.

The effects of polybrominated biphenyls (PBBs) on human health have previously attracted much attention, but recent studies of PBBs have been focused on BB-153 and a few other congeners. PBB concentrations in serum samples from residents of an area containing an electronic waste dismantling site were determined in this study. The total PBB concentrations (i.e., the sums of the concentrations of the 35 PBB congeners) were 229-1360 ng/g lipid. The BB-153 concentrations were markedly higher in the samples from people living in the electronic waste dismantling area than in samples from people living in a nearby control area. BB-153 was found in all of the samples from the study exposure area but the concentrations were relatively low (0.07-4.70 ng/g lipid). High BB-1 concentrations were found for the first time in serum from people living in both the electronic waste dismantling and control areas. The BB-1 concentrations were 211-1280 ng/g lipid. The retention times of the 35 PBB standards and PCBs (polychlorinated biphenyls) with similar structures were used to predict the retention times of unidentified PBB congeners to allow the PBB distributions in the serum samples to be identified. A total of 26 previously unidentified PBB congeners were identified in the human serum samples. BB-5, BB-35, BB-79, and BB-109 were found in >50% of the samples. The PBB patterns in the serum samples were different from the patterns previously found in serum after a PBB contamination incident in 1973, so the health risks currently posed by PBBs are worth studying. (C) 2021 Published by Elsevier Ltd.

Safety of 4,4′-Dibromobiphenyl. About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Wang, SJ; Jin, JX; Guo, C; Li, ZG; Wang, Y; Wei, YJ; Jin, J or concate me.

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

An article Rigid Multidimensional Alkoxyamines: A Versatile Building Block Library WOS:000599066100001 published article about COVALENT POLYMER NETWORKS; FREE-RADICAL POLYMERIZATIONS; EFFICIENT SYNTHESIS; EXCHANGE-REACTION; N-ALKOXYAMINES; INITIATORS; STAR; CHEMISTRY; CHAINS in [Matt, Yannick; Wessely, Isabelle; Gramespacher, Lisa; Braese, Stefan] Karlsruhe Inst Technol KIT, Inst Organ Chem IOC, Fritz Haber Weg 6, D-76131 Karlsruhe, Germany; [Matt, Yannick; Braese, Stefan] Karlsruhe Inst Technol KIT, 3DMM2O Cluster Excellence EXC2082 1390761711, Kaiserstr 12, D-76131 Karlsruhe, Germany; [Tsotsalas, Manuel] Karlsruhe Inst Technol KIT, Inst Funct Interfaces IFG, Hermann Von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany; [Braese, Stefan] Karlsruhe Inst Technol KIT, Inst Biol & Chem Syst IBCS FMS, Hermann Von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany in 2021, Cited 46. Recommanded Product: 92-86-4. The Name is 4,4′-Dibromobiphenyl. Through research, I have a further understanding and discovery of 92-86-4

Since the discovery of the living free-radical polymerization, alkoxyamines were widely used in nitroxide-mediated polymerization (NMP). Most of the known alkoxyamines bear just one functionality with only a few exceptions bearing two or more alkoxyamine units. Herein, we present a library of novel multidimensional alkoxyamines based on commercially available, rigid, aromatic core structures. A versatile approach allows the introduction of different sidechains which have an impact on the steric hindrance and dissociation behavior of the alkoxyamines. The reaction to the alkoxyamines was optimized by implementing a mild and reliable procedure to give all target compounds in high yields. Utilization of biphenyl, p-terphenyl, 1,3,5-triphenylbenzene, tetraphenylethylene, and tetraphenyl-methane results in linear, trigonal, square planar, and tetrahedral shaped alkoxyamines. These building blocks are useful initiators for multifold NMP leading to star-shaped polymers or as a linker for the nitroxide exchange reaction (NER), to obtain dynamic frameworks with a tunable crosslinking degree and self-healing abilities.

About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Matt, Y; Wessely, I; Gramespacher, L; Tsotsalas, M; Brase, S or concate me.. Recommanded Product: 92-86-4

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

Safety of 4,4′-Dibromobiphenyl. Recently I am researching about SMALL MOLECULES; BUILDING-BLOCKS; BENZOTHIADIAZOLE; OLIGOMERS; DERIVATIVES; FLUORESCENT; EMISSION; POLYMERS; BLEND; UNITS, Saw an article supported by the Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [18-29-17073]; RFBRRussian Foundation for Basic Research (RFBR) [18-33-20224]; Ministry of Science and Higher Education of the Russian Federation. Published in ELSEVIER SCI LTD in OXFORD ,Authors: Luponosov, YN; Solodukhin, AN; Balakirev, DO; Surin, NM; Svidchenko, EA; Pisarev, SA; Fedorov, YV; Ponomarenko, SA. The CAS is 92-86-4. Through research, I have a further understanding and discovery of 4,4′-Dibromobiphenyl

In this work, a series of novel luminescent molecules of butterfly-like architecture based on TPA fragments with different central and side aromatic blocks were designed and synthesized. Various properties of the molecules were studied by differential scanning calorimetry, thermogravimetric analysis, UV-Vis optical spectroscopy and compared within this series as well as to their analogs having terminal trimethylsilyl moieties instead of diphenylamine ones. The molecules reported are promising luminescent materials, which combine high thermal stability, good solubility and large molar extinction coefficients with high photoluminescence quantum yields for emission in the green and red spectral regions. The experimental and theoretical investigations reported give more insight to the structure – property correlations for the TPA-based luminophores, as well as to their photostability and peculiarities of the conjugation through triphenylamine units between the central and the side fragments.

Safety of 4,4′-Dibromobiphenyl. About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Luponosov, YN; Solodukhin, AN; Balakirev, DO; Surin, NM; Svidchenko, EA; Pisarev, SA; Fedorov, YV; Ponomarenko, SA or concate me.

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

Recently I am researching about ACTIVATED DELAYED FLUORESCENCE; LIGHT-EMITTING-DIODES; MOLECULAR-ORBITAL METHODS; BIPOLAR HOST MATERIALS; HIGH-EFFICIENCY; BLUE ELECTROPHOSPHORESCENCE; INTERMOLECULAR INTERACTIONS; DEGRADATION MECHANISMS; ELECTRONIC-STRUCTURE; THEORETICAL INSIGHT, Saw an article supported by the National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21403037]; National Research Foundation of Korea (NRF) – Ministry of Education, Science, and TechnologyMinistry of Education, Science and Technology, Republic of KoreaNational Research Foundation of Korea [2015R1D1A1A01061487]. Published in AMER CHEMICAL SOC in WASHINGTON ,Authors: Li, HF; Hong, MK; Scarpaci, A; He, XY; Risko, C; Sears, JS; Barlow, S; Winget, P; Marder, SR; Kim, D; Bredas, JL. The CAS is 92-86-4. Through research, I have a further understanding and discovery of 4,4′-Dibromobiphenyl. Computed Properties of C12H8Br2

Aryl sulfones and phosphine oxides are widely used as molecular building blocks for host materials in the emissive layers of organic light-emitting diodes. In this context, the chemical stability of such molecules in the triplet state is of paramount concern to long-term device performance. Here, we explore the triplet excited-state (T-1) chemical stabilities of aryl sulfonyl and aryl phosphoryl molecules by means of UV absorption spectroscopy and density functional theory calculations. Both the sulfur-carbon bonds of the aryl sulfonyl molecules and the phosphorus-carbon bonds of aryl phosphoryl derivatives are significantly more vulnerable to dissociation in the T-1 state when compared to the ground (S-0) state. Although the vertical S-0 -> T-1 transitions correspond to nonbonding -> pi-orbital transitions, geometry relaxations in the T-1 state lead to sigma-sigma* character over the respective sulfur-carbon or phosphorus carbon bond, a result of significant electronic state mixing, which facilitates bond dissociation. Both the activation energy for bond dissociation and the bond dissociation energy in the T-1 state are found to vary linearly with the adiabatic T-1-state energy. Specifically, as T-1 becomes more energetically stable, the activation energy becomes larger, and dissociation becomes less likely, that is, more endothermic or less exothermic. While substitutions of electron-donating or -accepting units onto the aryl sulfones and aryl phosphine oxides have only marginal influence on the dissociation reactions, extension of the pi-conjugation of the aryl groups leads to a significant reduction in the triplet energy and a considerable enhancement in the Ty-state chemical stabilities.

Computed Properties of C12H8Br2. About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Li, HF; Hong, MK; Scarpaci, A; He, XY; Risko, C; Sears, JS; Barlow, S; Winget, P; Marder, SR; Kim, D; Bredas, JL or concate me.

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

Recently I am researching about CONJUGATED POLYELECTROLYTES; SYNTHETIC POLYELECTROLYTES; METATHESIS; ANNULATION; ACID; EFFICIENCY; POLYMERS; CATIONS, Saw an article supported by the National Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21788102, 21674040]; Research Grants Council of Hong KongHong Kong Research Grants Council [16308116, C6009 -17G, A-HKUST605/16]; Innovation and Technology Commission [ITC-CNERC14SCO1, ITS/254/17]; National Key Research and Development program of China [2018YFE0190200]; Science and Technology Plan of Shen-zhen [JCYJ20170818113530705, JCYJ20180306180231853]; Natural Science Foundation for Distinguished Young Scholars of Guangdong Province [2016A030306013]; Pearl River Young Talents Program of Science and Technology in Guangzhou [201906010047]. Application In Synthesis of 4,4′-Dibromobiphenyl. Published in AMER CHEMICAL SOC in WASHINGTON ,Authors: Liu, XL; Li, MG; Han, T; Cao, B; Qiu, ZJ; Li, YY; Li, QY; Hu, YB; Liu, ZY; Lam, JWY; Hu, XL; Tang, BZ. The CAS is 92-86-4. Through research, I have a further understanding and discovery of 4,4′-Dibromobiphenyl

Polyelectrolytes play an important role in both natural biological systems and human society, and their synthesis, functional exploration, and profound application are thus essential for biomimicry and creating new materials. In this study, we developed an efficient synthetic methodology for in situ generation of azonia-containing polyelectrolytes in a one-pot manner by using readily accessible nonionic reactant in the presence of commercially available cheap ionic species. The resulting polyelectrolytes are emissive in the solid state and can readily form luminescent photopatterns with different colors. The azonia-containing polyelectrolytes possess extraordinary potency of reactive oxygen species (ROS) generation, enabling them to impressively kill methicillin-resistant Staphylococcus aureus (MRSA), a drug resistant superbug, both in vitro and in vivo.

Application In Synthesis of 4,4′-Dibromobiphenyl. About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Liu, XL; Li, MG; Han, T; Cao, B; Qiu, ZJ; Li, YY; Li, QY; Hu, YB; Liu, ZY; Lam, JWY; Hu, XL; Tang, BZ or concate me.

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

Shieh, MH; Liu, YH; Wang, CC; Jian, H; Lin, CN; Chen, YM; Huang, CY in [Shieh, Minghuey; Liu, Yu-Hsin; Wang, Chih-Chin; Jian, Huan; Lin, Chien-Nan; Chen, Yen-Ming; Huang, Chung-Yi] Natl Taiwan Normal Univ, Dept Chem, Taipei 11677, Taiwan published A comparative study on NHC-functionalized ternary Se/Te-Fe-Cu compounds: synthesis, catalysis, and the effect of chalcogens in 2019, Cited 80. Quality Control of 4,4′-Dibromobiphenyl. The Name is 4,4′-Dibromobiphenyl. Through research, I have a further understanding and discovery of 92-86-4.

A novel family of N-heterocyclic carbene (NHC)-incorporated Se-Fe-Cu compounds, bis-1,3-dimethylimidazol-2-ylidene (bis-Me-2-imy)-containing compound [(mu(4)-Se)Fe-3(CO)(9){Cu(Me-2-imy)}(2)] (2), bis-N-methyl- or bis-N-isopropyl-substituted benzimidazol-2-ylidene (bis-Me-2-bimy or bis-Pr-i(2)-bimy)-incorporated compounds [(mu(4)-Se)Fe-3(CO)(9){Cu(Me-2-bimy)}(2)] (3) or [(mu(4)-Se)Fe-3(CO)(9){Cu(Pr-i(2)-bimy)}(2)] (4), and a bis-1,3-dimethyl-4,5-dichloroimidazol-2-ylidene (bis-Me-2-Cl-2-imy)-containing compound [(mu(3)-Se)Fe-3(CO)(9){Cu(Me-2-Cl-2-imy)}(2)] (5), were synthesized in moderate yields in facile one-pot reactions of the ternary pre-designed compound [(mu(3)-Se)Fe-3(CO)(9){Cu(MeCN)}(2)] (1) with the corresponding imidazolium salts and (KOBu)-Bu-t in THF in an ice-water bath. Single-crystal X-ray analyses revealed that the Me-2-imy compound 2 or the Me-2-bimy compound 3 each exhibited a trigonal bipyramidal SeFe3(CO)(9)Cu geometry with an Fe2Cu plane further capped by a Cu(Me-2-imy) or Cu(Me-2-bimy) fragment, respectively, with one long Cu-Cu covalent bond. In addition, compound 4 also comprised a trigonal bipyramidal SeFe3(CO)(9)Cu core structure, but the second Cu(Pr-i(2)-bimy) group bridged the equatorial Fe-Fe edge with two unbonded Cu atoms, due to the presence of a sterically bulky Pr-i(2)-bimy fragment. On the other hand, the strong electron-withdrawing chloro-containing NHC compound 5 showed a comparatively open tetrahedral SeFe3(CO)(9) metal core, where two Fe-Fe edges each were further bridged by a Cu(Me-2-Cl-2-imy) fragment. Due to the nonclassical C-H center dot center dot center dot O(carbonyl) hydrogen bonds between the CO groups of the SeFe3(CO)(9)Cu-2 core and CH moieties of the neighboring NHC ligands, both compounds 2 and 3 comprised a one-dimensional network, while compounds 4 and 5 each were made up of a two-dimensional framework in the solid state, which efficiently enhanced the stability of these Se-Fe-Cu NHC compounds. Importantly, all of these synthesized Se-Fe-Cu NHC compounds 2-5 had pronounced catalytic activities for the homocoupling of arylboronic acids with high catalytic yields. Finally, these Se-containing Fe-Cu NHC compounds further represented excellent models for studying chalcogen effects in comparison to their Te analogs, as demonstrated by their catalytic performances and electrochemical behaviors, and by DFT calculations.

About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Shieh, MH; Liu, YH; Wang, CC; Jian, H; Lin, CN; Chen, YM; Huang, CY or concate me.. Quality Control of 4,4′-Dibromobiphenyl

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

An article Synthesis of novel magnetic CoFe2O4-embedded MIL-101 with tetramethylammonium hydroxide for extraction of toxic flame retardants in environmental water samples WOS:000484764800001 published article about SOLID-PHASE EXTRACTION; METAL-ORGANIC FRAMEWORKS; COFE2O4 NANOPARTICLES; PHOSPHATE; MICROEXTRACTION; EXPOSURE; TETRABROMOBISPHENOL; METABOLITES; DUST; MOFS in [Yang, Jiahui; Ma, Kaixuan; Li, Nan; Gu, Xinyue; Miao, Shengchao; Zhang, Meixing; Yang, Jing; Cui, Shihai] Nanjing Normal Univ, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab Biomed Mat,Sch Chem & Mat Sci, Nanjing, Jiangsu, Peoples R China; [Cui, Shihai] Nanjing Lvshiyuan Environm Protect Technol Co LTD, Nanjing, Jiangsu, Peoples R China in 2020, Cited 47. The Name is 4,4′-Dibromobiphenyl. Through research, I have a further understanding and discovery of 92-86-4. HPLC of Formula: C12H8Br2

Novel magnetic CoFe2O4-embedded MIL-101(Cr) with tetramethylammonium hydroxide (CoFe2O4/MIL-101T) was prepared through the facile hydrothermal method. Tetramethylammonium hydroxide acts as a template molecule and avoids the recrystallisation of terephthalic acid. The material was applied as the adsorbent in the magnetic solid-phase extraction (MSPE) process coupled with high-performance liquid chromatography to detect the five flame retardants in environmental water samples. Several parameters affecting MSPE efficiency were systematically investigated, such as MIL-101T content, material amount, desorption solvents, adsorption time, solution pH, theoretical maximum enrichment factor (EFmax) and the reusability. Under optimised conditions, good linearities were achieved for five flame retardants with correlation coefficients R-2 > 0.9961. The limits of detections for analytes at the signal-to-noise ratio of three were 0.013-0.071 mu g center dot L-1. This method was applied to the analysis of tap, pond, lake and river waters. The recoveries were in the range of 81.5 +/- 3.2-107.0 +/- 2.3% with the relative standard deviations ranging from 0.11% to 8.66% in four real water samples. The adsorption mechanism was the hydrophobic interaction between the material and the analytes besides pore adsorption action of the material.

About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Yang, JH; Ma, KX; Li, N; Gu, XY; Miao, SC; Zhang, MX; Yang, J; Cui, SH or concate me.. HPLC of Formula: C12H8Br2

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem

Recently I am researching about EXCITED-STATE ABSORPTION; OPTICAL-PROPERTIES; SPECTRA; LUMINESCENCE; FLUORESCENCE; POLYPHENYLS; DYNAMICS; SYSTEMS, Saw an article supported by the Russian Ministry of Science and Higher Education; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-29-17006]; Ministry of Science and Higher Education of the Russian Federation; State of Bavaria within the Solar Technologies Go Hybrid (SolTech)” research program; [NSh-5698.2018.3]. Published in ROYAL SOC CHEMISTRY in CAMBRIDGE ,Authors: Ponomarenko, SA; Surin, NM; Skorotetcky, MS; Borshchev, OV; Pisarev, SA; Svidchenko, EA; Fedorov, YV; Molins, F; Brixner, T. The CAS is 92-86-4. Through research, I have a further understanding and discovery of 4,4′-Dibromobiphenyl. Application In Synthesis of 4,4′-Dibromobiphenyl

We report on the first experimental and theoretical investigations of ultrafast intramolecular energy transfer for a novel class of highly luminescent materials – nanostructured organosilicon luminophores (NOLs). For this purpose we designed, synthesized and investigated a NOL, (POPOP)Si-2(3Ph-EH)(6), consisting of six p-terphenyl (3Ph) donor and 1,4-bis(5-phenyloxazol-2-yl)benzene (POPOP) acceptor luminophores – well-known laser dyes widely used in plastic scintillators as an activator and a spectral shifter, respectively. The NOL shows excellent optical properties – molar absorption coefficient up to 2.6 x 10(5) L mol(-1) cm(-1), photoluminescence quantum yield up to 96% and pseudo Stokes shift of 100 nm. Its intramolecular energy transfer efficiency determined from steady-state optical measurements was found to be 93%, while the excitation lifetime was less than 1 ns. For deeper understanding of the processes of intramolecular energy transfer within NOLs, ultrafast spectroscopy investigations of the NOL, model donor and acceptor luminophores were performed for the first time for this class of compounds. It was found that the time constant of the energy transfer from donor to acceptor luminophores within the NOL is tau(1) = 105 fs, which is significantly faster than the vibrational relaxation within the donor (ca. 400 fs). Based on these findings, a kinetic scheme of the electronic excitation energy deactivation processes in the NOL was developed. The results obtained not only directly prove that the mechanism of energy transfer within the NOLs is based on Forster resonance energy transfer of the excitation energy from donor to acceptor luminophores, but also highlight the advantages of NOLs and NOL-based materials for future photonics applications – fast and efficient plastic scintillators, scintillating fibers and other spectral shifting optical materials.

About 4,4′-Dibromobiphenyl, If you have any questions, you can contact Ponomarenko, SA; Surin, NM; Skorotetcky, MS; Borshchev, OV; Pisarev, SA; Svidchenko, EA; Fedorov, YV; Molins, F; Brixner, T or concate me.. Application In Synthesis of 4,4′-Dibromobiphenyl

Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem