The triplet state of 1,1′-diethyl-2,2′-cyanine iodide in neat and mixed crystals

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Abstract
The singlet–triplet absorption spectrum of crystalline 1,1′‐diethyl‐2,2′‐cyanine iodide has been obtained. The absorption origin consists of two lines separated by ∼4.0 cm−1. Zeeman spectra were used to assign the higher energy more intense line to the Au factor group state and the lower energy line to the Bu factor group state. Emission spectra have been obtained from both dilute and concentrated solid solutions of the dye. The results from the concentrated samples indicate that the largest excitation–transfer interaction between translationally inequivalent molecules is less than 1 cm−1.

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