Formation and Characterization of Aggregates of Merocyanine Dyes in Vacuum-Deposited Thin Film
Formation and Characterization of Aggregates of Merocyanine Dyes in Vacuum-Deposited Thin Film
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真空沉积薄膜中部花青染料聚集体的形成和表征
DOI：
10.1143/jjap.40.6951
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发表时间：
2001
影响因子：
1.5
通讯作者：
K. Nitta
中科院分区：
文献类型：
--
作者：
Y. Ueda;K. Nitta
采用真空蒸发法制备了苯并噻唑环上不同长度烷基取代的花菁(MD)染料薄膜。根据罗丹宁环上取代基的种类、结晶度和烷基链长，讨论了二甲胺蒸汽处理后的结构和聚集体的形成。研究发现，在罗丹宁环上引入羧甲基和制备无定形薄膜对聚集体的形成非常重要。MD-2、-5和-6膜形成H-聚集体，MD-10和无定形MD-18形成J-聚集体。根据位于苯并噻唑环的烷基链长的不同，聚集体结构的差异取决于烷基链之间的空间位阻程度。H-和J-聚集体形成的活化能分别为4.46kJ·mol-1和11.07kJ·mol-1。
Thin films of merocyanine (MD) dyes substituted with alkyl chains of various lengths at the benzothiazol ring are prepared by vacuum evaporation. The structure and aggregate formation upon dimethylamine vapor treatment are discussed based on the kind of substituent at the rhodanine ring, crystallinity and alkyl chain length. It is found that the introduction of a carboxymethyl group at the rhodanine ring and the fabrication of amorphous films are very important in aggregate formation. MD-2, -5 and -6 films, which the numbers indicate the number of carbon atoms in the alkyl chain, form H-aggregates, and MD-10 and amorphous MD-18 form J-aggregates. The difference in aggregate structure according to the alkyl chain length positioned at the benzothiazol ring depends on the degree of steric hindrance between alkyl chains. The activation energies of H- and J-aggregate formation are estimated to be 4.46 kJ mol-1 and 11.07 kJ mol-1, respectively.