Complete Assignment of 1H and 13C NMR Spectra of Poly(N-vinylcarbazole)

Karali, Aglaia; Froudakis, George E.; Dais, Photis; Heatley, Frank

doi:10.1021/ma9918912

Cited by 38 publications

(43 citation statements)

References 11 publications

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“…The side chain -OCH 2 and -NCH 2 methylene carbons of C unit along with -OCH 3 carbon of the M unit appear as singlet around 62.07, 42.05 and 51.75 ppm, respectively, reflecting their insensitivity to compositional and configurational sequences. The aromatic carbons of the side-chain carbazole moiety appear as singlet in the region 108.62-140.23 ppm as reported by Dias et al [47,48].…”

Section: C{ 1 H} Nmr Studiessupporting

confidence: 68%

Comprehensive analysis of stereoregularity and sequence distribution in 2-N-carbazolylethyl acrylate and methyl methacrylate copolymers by 2D NMR spectroscopy and their thermal studies

Brar¹,

Markanday²

2005

Polymer

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Section: C{ 1 H} Nmr Studiessupporting

confidence: 68%

Comprehensive analysis of stereoregularity and sequence distribution in 2-N-carbazolylethyl acrylate and methyl methacrylate copolymers by 2D NMR spectroscopy and their thermal studies

Brar¹,

Markanday²

2005

Polymer

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“…11 Correct assignments of the carbazole ring in poly(N-vinylcarbazole) are reported by Dias et al 12 The methine carbon resonances of both V and M units of the copolymer are sensitive to compositional sequences. The expanded region of methine carbon of the V unit in the DEPT-90 spectra of V/M copolymers with different mole fractions of V and the corresponding homopolymer is shown in Figure 3 MMV, and VMV triads respectively.…”

Section: C{ 1 H} Nmr Studiesmentioning

confidence: 73%

“…Dais et al 12 have reported the complete assignments of 1 H and 13 C spectra of PVK with the help of two-dimensional NMR techniques. In our earlier publication, 13 we reported the microstructure of Nvinylcarbazole/vinyl acetate copolymers using one and two-dimensional NMR spectroscopy.…”

Section: Spectramentioning

confidence: 99%

Complete Spectral Assignment of Poly(N-Vinylcarbazole-co-Methyl Acrylate)s by NMR Spectroscopy

Brar

Kaur

2002

Polym J

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ABSTRACT:The copolymers of N-vinylcarbazole/methyl acrylate (V/M) of different compositions were prepared by solution polymerisation using 2,2'-Azobisisobutyronitrile (AIBN) as an initiator and their composition was determined from quantitative 13 C{ 1 H} NMR spectroscopy. Reactivity ratios for the comonomers were calculated using the Kelen-Tudos (KT) and non-linear error in variable methods (EVM). The complete spectral assignment of the overlapping 1 H and 13 C{ 1 H} spectra of the copolymers were done with the help of Distortionless Enhancement by Polarization Transfer (DEPT), two dimensional heteronuclear single quantum correlation (HSQC) and total correlated spectroscopy (TOCSY). The assignments of various compositional sequences were done in the carbon resonance signals of the methoxy region of M unit, the methine region of both V and M units and the methylene region of both V and M units.KEY WORDS Poly(N-vinylcarbazole-co-methyl acrylate)s / Two Dimensional Nuclear Magnetic Resonance (2D NMR) Spectroscopy / Microstructure / Poly(N-vinylcarbazole) (PVK) has been the subject of intensive investigation because it is one of the most sensitive photoconductive organic polymers. 1, 2 It has important applications in electrophotography, microlithography, electrochromic display devices, photoelectric devices, electroluminescent displays, and photothermoplastic imaging. 3 PVK is a stiff, brittle substance with poor mechanical and processing characteristics. Copolymerization with suitable monomers could soften the resulting product leading to better film properties and improve its mechanical properties. The copolymerization of N-vinylcarbazole with monomers like alkyl acrylates and alkyl methacrylates has been studied by several investigators. [4][5][6] The determination of microstructure in copolymers is of value in establishing structure-property relationship. 7 It is well known that NMR spectroscopy is probably the most effective method for characterizing the microstructure of polymers. [8][9][10] Crone and Natansohn 11 have reported the NMR analysis of microstructure of poly(methyl acrylate-co-N-vinylcarbazole). They have assigned the aliphatic and aromatic region in the proton spectra and aromatic region in the carbon spectra of the copolymers. However, some of the carbon and proton signals of the carbazole ring are erroneously assigned by them. They have reported the sequence distribution in the copolymers using C-1, 8a and H-1 resonance signals of the carbazole ring and the carbonyl carbon resonance signal of the M unit in the copolymer. However, they have not described the sequence distribution using the aliphatic region of the copolymer † To whom all correspondence should be addressed. spectra.Dais et al. 12 have reported the complete assignments of 1 H and 13 C spectra of PVK with the help of two-dimensional NMR techniques. In our earlier publication, 13 we reported the microstructure of Nvinylcarbazole/vinyl acetate copolymers using one and two-dimensional NMR spectroscopy. In continuation of our earlier w...

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“…The 1 H-NMR spectrum of poly(NVC) obtained with Li-(S)-2-FIDH initiator (Table 1, [16] . However, whether the polymer was end capped with initiator moiety or not could not be sure from the 1 H-NMR spectrum.…”

Section: Structures Of the Polymersmentioning

confidence: 99%

Asymmetric polymerization of N-vinylcarbazole with optically active anionic initiators

Cao

Huang

et al. 2015

Chin J Polym Sci

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The anionic polymerization of N-vinylcarbazole (NVC) by using optically active anionic initiators such as the lithium salts of (S)-1-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole ((S)-1-FIDH) and (S)-2-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole ((S)-2-FIDH) and complexes of (-)-Sparteine with n-butylithium (n-BuLi-(-)-Sp) or fluorenyl lithium (FILi-(-)-Sp) was achieved. The yield and specific rotation of poly(N-vinylcarbazole)s (poly(NVC)s) were considerably affected by the molar ratio of (S)-FIDH to NVC. The highest yield and specific rotation were obtained with Li-(S)-1-FIDH as an initiator, with a molar ratio of monomer and initiator [M]/[I] = 10/1. The effects of the chiral initiators, type of solvent and the polymerization temperature were investigated. The obtained optical activity of polymers was attributed to asymmetric induction of the chiral initiators.

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Complete Assignment of ¹H and ¹³C NMR Spectra of Poly(N-vinylcarbazole)

Cited by 38 publications

References 11 publications

Comprehensive analysis of stereoregularity and sequence distribution in 2-N-carbazolylethyl acrylate and methyl methacrylate copolymers by 2D NMR spectroscopy and their thermal studies

Comprehensive analysis of stereoregularity and sequence distribution in 2-N-carbazolylethyl acrylate and methyl methacrylate copolymers by 2D NMR spectroscopy and their thermal studies

Complete Spectral Assignment of Poly(N-Vinylcarbazole-co-Methyl Acrylate)s by NMR Spectroscopy

Asymmetric polymerization of N-vinylcarbazole with optically active anionic initiators

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