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Halochromism of N ‐phenoxide betaine dye in salt‐containing poly(ethylene oxide) oligomers
Author(s) -
Ohno Hiroyuki,
Kawanabe Hisashi
Publication year - 1996
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199609)7:9<754::aid-pat553>3.0.co;2-5
Subject(s) - betaine , ethylene oxide , solvatochromism , salt (chemistry) , materials science , polarity (international relations) , absorption (acoustics) , oxide , polymer chemistry , photochemistry , copolymer , organic chemistry , molecule , chemistry , polymer , metallurgy , composite material , biochemistry , cell
The polarity of poly(ethylene oxide) (PEO) oligomers and PEO/salt mixed system was analyzed as the negative solvatochromism and halochromism of betaine dye, 2,6‐diphenyl‐4‐(2,4,6‐triphenylpyridinio) phenolate ( 1 ). The polarity of PEO oligomers, detected as the shift of the absorption maximum of the dye ( 1 ), decreased with increasing PEO chain length, reflecting the terminal hydroxyl group fraction. The polarity of the PEO matrix was the function of both lattice energy and cation radius of the added salt under the same salt concentration. There is a clear relation between the absorption maximum and the lattice energy of a series of salts having the same cation. The lattice energy of most salts was suggested to be estimated empirically by this relation.