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Research on electron donor‐acceptor (EDA) association reaction of PVKs characterized by special tacticity with polynitrofluorenone
Author(s) -
HuanSheng Bao,
ChangYan Liu,
RiHeng Hu JihHeng Hu
Publication year - 1989
Publication title -
acta chimica sinica english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 0256-7660
DOI - 10.1002/cjoc.19890070102
Subject(s) - tacticity , chemistry , acceptor , electron donor , electron acceptor , absorption (acoustics) , crystallography , molar ratio , sequence (biology) , absorption spectroscopy , reaction rate constant , polymer , polymer chemistry , photochemistry , organic chemistry , kinetics , catalysis , materials science , polymerization , biochemistry , physics , composite material , quantum mechanics , condensed matter physics
The electron donor‐acceptor (EDA) association constants for the reaction of poly ( N ‐vinylcarbazole) (PVK) samples, prepared under three conditions respectively, or their model compound, N ‐ethenylcarbazole (NECA), as a donor, and polynitrofluorenone as an acceptor and the molar absorption coefficients of their products have been determined. By analysis of 1 H NMR of PVK quantitatively, the isotactic sequence's percentage X 1 is estimated. The association constants K may be given by K = K 1 X 1 + K 2 X 2 , where the subscripts 1 and 2 denote the isotactic and syndiotactic sequence of the polymer respectively. From the principle of spectral analyses has been deduced the following relationship: K ε = K 1 X 1 ε 1 + K 2 X , ε 2 , and estimated the values for K 1 , K 2 , ε 1 and ε 2 where ε is the molar absorption coefficient.