Synthesis and Fluorescence of Pyridine-<i>N</i>-alkyl carbazole Copolymer Prepared by Oxidative-coupling Reaction

Zheng, Jinyun; Zhan, Caimao; Qin, Jingui; Zhan, Rui

doi:10.1246/cl.2002.1222

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…The main peaks on the spectra are attributed to a π→π* transition, and the shoulders correspond to n→π* transitions in the respective materials. A comparison of the photophysical properties of the synthesized polymers may be made with structurally related polymers previously synthesized by Zheng et al [21,28] . The observed differences in the absorption spectra of both polymer series arise due to the difference in alkyl chain lengths.…”

Section: Resultsmentioning

confidence: 99%

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Novel carbazole–pyridine copolymers by an economical method: synthesis, spectroscopic and thermochemical studies

Saeed¹,

Irfan²,

Samra³

2011

Beilstein J. Org. Chem.

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SummaryThe synthesis, as well as spectroscopic and thermochemical studies of a novel class of carbazole-4-phenylpyridine co-polymers are described. The synthesis was carried out by a simple and cheaper method compared to the lengthy methods usually adopted for the preparation of carbazole–pyridine copolymers which involve costly catalysts. Thus, two series of polymers were synthesized by a modified Chichibabin reaction, i.e., by the condensation of diacetylated N-alkylcarbazoles with 3-substituted benzaldehydes in the presence of ammonium acetate in refluxing acetic acid. All the polymers were characterized by FTIR, 1H NMR, 13C NMR, UV–vis spectroscopy, fluorimetry, TGA and DSC. The weight average molecular masses (M w) of the polymers were estimated by the laser light scattering (LLS) technique.

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Section: Resultsmentioning

confidence: 99%

“…Zheng et al have prepared a new class of copolymers that incorporate pyridine and N -alkyl carbazole alternatively into the main chain by oxidative-coupling copolymerization. These polymers are thermostable, highly soluble, and processable, and the fluorescence spectra of the polymers display blue light emitting properties [21]. …”

Section: Introductionmentioning

confidence: 99%

Novel carbazole–pyridine copolymers by an economical method: synthesis, spectroscopic and thermochemical studies

Saeed¹,

Irfan²,

Samra³

2011

Beilstein J. Org. Chem.

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“…The investigation of the elongation at break revealed that the polymers PUU 2 , PUU 3 and PUU 4 presented comparable values, the highest value of elongation at break was associated with PUU 3 , which contained a molar ratio DAPy/DBDI of 2/3.15 (table 4, figure 1). In the case of PUU 1 that contained PTMG, DAPy and MDI at a molar ratio of 1/1/2, the weakest mechanical property values were observed.…”

Section: Mechanical Behaviormentioning

confidence: 98%

“…Mechanical tests including the stress-strain data and the load-unload cycles at constant rate of extension, with measurement of hysteresis and strain recovery were performed for this series of polyurethane-ureas containing pyridine rings. The results of the stress-strain measurements are given in table 4.…”

Section: Mechanical Behaviormentioning

confidence: 99%

“…Conjugated polymers having electroconductive and photoconductive properties such as poly(2,6-or 2,5-) pyridine were synthesized [3]. As shown earlier, new alternating copolymers like poly-pyridine-N-alkyl carbazole [4] and poly-thienyl-pyridine [5] with photoconductive properties were synthesized. Conjugated semiconductor polyazomethine containing pyridine units [6] were obtained.…”

Section: Introductionmentioning

confidence: 98%

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New Heterocyclic Polyurethane-ureas Based on 4,4'-dibenzyl diisocyanate. 2. Influence of Pyridine Units on the Mechanical Properties

Scortanu¹,

Prisăcariu²,

Hitruc³

et al. 2006

High Performance Polymers

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Heterocyclic polyurethane-ureas containing pyridine units on the main chain have been prepared by a two-step polyadition reaction. First, an urethane prepolymer was prepared in bulk starting from a macrodiol, which was a polyester-diol such as poly(ethylene adipate) (PEA) or a polyether-diol such as poly(tetramethylene glycol) (PTMG), and a diisocyanate such as 4,4 1 -dibenzyl diisocyanate (DBDI) or 4,4 1 -methylene-bis(phenyl-isocyanate) (MDI). The resulting urethane prepolymer containing NCO end groups was polymerized afterwards in DMF solution by using 2,6-diamino pyridine (DAPy) as chain extender, leading to polyurethane-ureas containing pyridine units The hard segments contents varied between 1.458-1.967 mol NHCOO/1000 g polymer. The resulting polymers were characterized by IR spectra, elemental and thermogravimetric analyses, differential scanning calorimetry, gel permeation chromatography, inherent viscosity, water retention measurements and mechanical properties. The study of the relationship between structure and properties reveals the influence of the nature of starting materials, macrodiols, the heterocyclic diamine and diisocyanates on the mechanical properties of the polymers. The large number of hydrogen bondings that formed between urea and urethane groups and the presence of pyridine rings in the polymer chain induced an improved thermal stability and good mechanical properties. The influence of the hard segment length was also studied. A greater length of the hard segments led to higher values of some mechanical tests such as: 100 and 300% moduli, strength stress and elongation at break. The mechanical behavior of these polymers is discussed and compared with that of earlier reported linear polyurethane-ureas based on MDI or with that of related polyurethanes chain-extended with diols.

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Synthesis of biaryls and polyaryls by oxidative couplings of arenes

Cepanec¹

2004

Synthesis of Biaryls

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Synthesis and Fluorescence of Pyridine-N-alkyl carbazole Copolymer Prepared by Oxidative-coupling Reaction

Cited by 8 publications

References 8 publications

Novel carbazole–pyridine copolymers by an economical method: synthesis, spectroscopic and thermochemical studies

Novel carbazole–pyridine copolymers by an economical method: synthesis, spectroscopic and thermochemical studies

New Heterocyclic Polyurethane-ureas Based on 4,4'-dibenzyl diisocyanate. 2. Influence of Pyridine Units on the Mechanical Properties

Synthesis of biaryls and polyaryls by oxidative couplings of arenes

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