Relationship between the Molecular Structure of Cyanine Dyes and the Vibrational Fine Structure of their Electronic Absorption Spectra期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Relationship between the Molecular Structure of Cyanine Dyes and the Vibrational Fine Structure of their Electronic Absorption Spectra

Authors:	Heinz Mustroph Dr. Knut Reiner Dr. Jürgen Mistol Dr. Steffen Ernst Dr. Dietmar Keil Lothar Hennig Dr.

Affiliation:	1. FEW Chemicals GmbH, Technikumstra?e 1, 06756 Bitterfeld‐Wolfen (Germany), Fax: (+49)?3494‐638099;2. University of Leipzig, Department of Organic Chemistry, Johannisallee 29, 04103 Leipzig (Germany)

Abstract:	Vibronic sub‐bands in the electronic absorption spectra of symmetrical cyanine dyes (see picture) are attributed to the symmetric C? C valence vibration of the polymethine chain in the excited state. The ³J(H,H) coupling constants in the polymethine chain can be used to characterize the bond localization within the chain in the ground state and thus to explain the intensity distribution of the sub‐bands.

Keywords:	absorption chromophores cyanine limit dyes/pigments vibronic transitions