First example of polystyrene end-functionalized with excited state intramolecular proton transfer (ESIPT) fluorophore by ATRP method

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Jianmei Lu ◽  
Liang Zhang ◽  
Qingfeng Xu ◽  
Najun Li ◽  
Feng Yan ◽  
...  
Keyword(s):  
Excited State ◽  
Optical Property ◽  
Proton Transfer ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Reaction Temperature ◽  
Intramolecular Proton Transfer ◽  
Chain Extension ◽  
Molar Ratio ◽  
H Nmr

AbstractA novel initiator, 2-benzothiazol-2-yl-5-bromomethyl-phenol (BYBP) containing excited state intramolecular proton transfer (ESIPT) fluorophore was synthesized. Atom transfer radical polymerization (ATRP) of styrene was conducted successfully using BYBP as initiator, cuprous bromide (CuBr)/N,N,N’,N”,N’-pentamethyldiethylenetriamine (PMDETA) as catalyst, and cyclohexanone/DMF (mcyclohexanone: mDMF = 1: 1) as solvent. Factors such as the reaction temperature and molar ratio of catalyst to initiator, which could affect the ATRP system, were discussed in the paper. Chain extension was conducted using polymer as the macro-initiator which was characterized via 1H NMR. The optical property of initiator was well preserved in the obtained polystyrene, and the endfunctionalized polystyrene exhibited obvious fluorescent emission at about 530 nm.

Atom transfer radical polymerization of styrene initiated by the novel initiator N-bromosuccinimide

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Wei Zhang ◽  
Xiulin Zhu ◽  
Jian Zhu
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Monomer Conversion ◽  
Chain Extension ◽  
Atom Transfer ◽  
The Novel ◽  
Molecular Weights ◽  
H Nmr ◽  
Initiation System ◽  
Low Efficiency

Abstract Heterogeneous atom transfer radical polymerization of styrene initiated by N-bromosuccinimide in bulk was successfully carried out with CuBr/2,2’-bipyridine as the catalyst. The kinetics follow first order in monomer and molecular weights (polydispersities Mw/Mn = 1.23 - 1.66) increase linearly with monomer conversion, indicating the ‘living’/controlled nature of the polymerization. However, the number-average molecular weights were usually higher than the theoretical ones. That demonstrates the relatively low efficiency of the initiator, the causes of which are discussed. The obtained polystyrenes functionalized with α-α-pyrrolidine- 2,5-dionyl and ω-Br as the end groups were characterized by 1H NMR spectroscopy. They can be used as macroinitiators for chain extension reaction. A polymerization mechanism for this novel initiation system is proposed.

Atom transfer radical polymerization of styrene initiated by the novel initiator 2-bromo-2-nitropropane

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Gang Wang ◽  
Xiulin Zhu ◽  
Cheng Zhengping ◽  
Jian Zhu
Keyword(s):  
Molecular Weight ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Average Molecular Weight ◽  
Monomer Conversion ◽  
Catalyst System ◽  
Chain Extension ◽  
Atom Transfer ◽  
The Novel ◽  
H Nmr

AbstractHeterogeneous atom transfer radical polymerization (ATRP) of styrene initiated by 2-bromo-2-nitropropane in bulk was carried out with CuCl/2,2′-bipyridine as the catalyst. The kinetics was first order in monomer and the numberaverage molecular weight of the polymer increased linearly with monomer conversion, indicating the ‘living’/controlled nature of the polymerization. However, the number-average molecular weight was usually higher than the theoretical one. The nitro group might react with the Cu complex, resulting in insufficient initiation. The amount of catalyst has no effect on the controllability of this catalyst system for the ATRP of styrene. The presence of a halide end group in the obtained polymer was confirmed by both 1H NMR and chain-extension reaction.

scholarly journals An enhanced sampling QM/AMOEBA approach: The case of the excited state intramolecular proton transfer in solvated 3-hydroxyflavone

2021 ◽  
Vol 154 (18) ◽  
pp. 184107
Author(s):  
Michele Nottoli ◽  
Mattia Bondanza ◽  
Filippo Lipparini ◽  
Benedetta Mennucci
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Enhanced Sampling

scholarly journals The development of aryl-substituted 2-phenylimidazo[1,2-a]pyridines (PIP) with various colors of excited-state intramolecular proton transfer (ESIPT) luminescence in the solid state

2016 ◽  
Vol 4 (16) ◽  
pp. 3599-3606 ◽  
Author(s):  
Toshiki Mutai ◽  
Tatsuya Ohkawa ◽  
Hideaki Shono ◽  
Koji Araki
Keyword(s):  
Excited State ◽  
Solid State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Aryl Group ◽  
Red Emission ◽  
Wide Range

The color of ESIPT luminescence of HPIP is tuned in a wide range by the introduction of aryl group(s), and thus a series of PIPs showing blue to red emission is realized.

ChemInform Abstract: EXCITED-STATE INTRAMOLECULAR PROTON TRANSFER AND VIBRATIONAL RELAXATION IN 2-(2-HYDROXYPHENYL)BENZOTHIAZOLE

1983 ◽  
Vol 14 (28) ◽  
Author(s):  
K. DING ◽  
S. J. COURTNEY ◽  
A. J. G. STRANDJORD ◽  
S. FLOM ◽  
D. M. FRIEDRICH ◽  
...  
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Vibrational Relaxation ◽  
Intramolecular Proton Transfer
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