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Aggregation and photofading behaviour of unsymmetrical squarylium dyes containing a quinolylidene moiety
Author(s) -
Kim SungHoon,
Hwang SeokHwan,
Kim NokKyung,
Kim JaeWoo,
Yoon CheolMin,
Keum SamRok
Publication year - 2000
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2000.tb00031.x
Subject(s) - moiety , chemistry , chloroform , photochemistry , absorption (acoustics) , organic chemistry , materials science , composite material
Representatives of a new class of unsymmetrical squarylium dyes containing a quinolylidene moiety have been synthesised and characterised. These dyes absorbed at a longer wavelength (11–50 nm) than the corresponding symmetrical squarylium dyes. The influence of the quinolylidene moiety on the absorption of these dyes was studied and compared with that calculated by the PPP‐MO method. The photostability properties of the dyes were investigated in chloroform with a high‐pressure mercury lamp. The aggregation of the unsymmetrical squarylium dyes were also studied in different DMSO/water solutions, including solutions with γ‐cyclodextrin.