Isophorcarubin — A Conformationally Restricted and Highly Fluorescent Bilirubin | Zendy

Kufer W. | Zendy; Scheer H. | Zendy; Holzwarth A. R. | Zendy

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Isophorcarubin — A Conformationally Restricted and Highly Fluorescent Bilirubin

Author(s) -

Kufer W.,

Scheer H.,

Holzwarth A. R.

Publication year - 1983

Publication title -

israel journal of chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.908

H-Index - 54

eISSN - 1869-5868

pISSN - 0021-2148

DOI - 10.1002/ijch.198300033

Subject(s) - chemistry , chromophore , fluorescence , solvent , yield (engineering) , photochemistry , rigidity (electromagnetism) , stereochemistry , organic chemistry , optics , physics , materials science , structural engineering , metallurgy , engineering

The biliverdins 2b, 5 and 1 have been reduced with NaBH 4 to the bilirubins 8, 7 and 6 , respectively. The conformation of these pigments is increasingly extended and the flexibility is increasingly restricted in the sequence given above, which does not influence the ease of reduction. The fluorescence of 6 and 7 has been studied at ambient temperature and 77 K in ethanol and 2‐methyltetrahydrofuran. 6 has an unusually high fluorescence yield which has been related to the conformational rigidity of its ring C, D chromophore. Both 6 and 7 show evidence of solvent and temperature dependent inhomogeneities in their fluorescence spectra.

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