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The fluorescence of biliverdin dimethyl ester

โœ Scribed by Silvia E. Braslavsky; Alfred R. Holzwarth; Harald Lehner; Kurt Schaffner

Publisher
John Wiley and Sons
Year
1978
Tongue
German
Weight
201 KB
Volume
61
Category
Article
ISSN
0018-019X

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โœฆ Synopsis

Abstract

Freshly prepared solutions of biliverdin dimethyl ester (2) in ethanol showed fluorescence maxima at 710 and 770 nm [ฮฆ~F~ = 1.1. 10^โˆ’4^ (room temperature) and 5.0 10^โˆ’4^ (77 K)]. The maxima of monoprotonated 2 at 77 K were shifted to 725 and 806 nm and the quantum yield was increased to 2.6. 10^โˆ’2^. This acid effect was reversible by neutralization with base. When a neutral solution was kept standing in the dark at room temperature, or when an acidic solution was neutralized by base, an additional fluorescence maximum at 500 nm with a mirror image excitation spectrum with ฮป~max~ = 470 nm developed, which disappeared on addition of acid and which is attributed to a chemical change of 2.

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