Bile Pigment Structures, III. Crystal and Molecular Structure of Diethoxybilirubin Diethyl Ester
Open Access
- 1 November 1979
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 34 (11) , 1542-1546
- https://doi.org/10.1515/znb-1979-1112
Abstract
Diethoxybilirubin diethyl ester crystallises triclinic P1 with a = 13.903(5), b = 17.211(7), c = 9.831(5) Å, α= 110.07(3), β = 111.22(3), γ = 69.04(3)°, Z = 2, Dx - 1.15 gcm-3. The two pyrromethene systems of the tetrapyrrole are orientated almost perpendicular to one another (interplanar angle = 91.5°). Considerable bond delocalisation is observed within the individual pyrromethene units, which contain intramolecular N-H···N hydrogen bonds of length 2.73 and 2.80 Å. Parallel stacking of the chromophores is not observed in the crystal lattice.Keywords
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