Rhodopsin, the isomeric pigments formed from 9‐cis‐ and 9, 13‐dicis‐retinal, and the synthetic pigments formed from 9‐cis‐ and 11‐cis‐14‐methylretinal were irradiated with 490 nm light at ‐196C. Absorption spectral changes indicate that a distinguishable bathorhodopsin type intermediate may be formed for each pigment. The bathorhodopsin intermediates of the 9‐cis pigments have band maxima hypsochromically shifted by4–5 nm compared to their corresponding rhodopsins. The bathorhodopsin type intermediate formed upon irradiation of 9, 13‐dicis‐rhodopsin has an absorption that maximizes 6 nm shorter than that of rhodopsin. Band maxima of the bathorhodopsin intermediates of the 14‐methylrhodopsins are bathochromatically shifted ca. 8 nm compared to their corresponding rhodopsins.
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Waddell et al. (1984) studied this question.
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