Intramolecular Hydrogen Bonding in Bilirubin Bis-Tetra-n-butyl Ammonium Salts as Determined by1H-NMR Spectroscopy
- 1 May 1986
- journal article
- research article
- Published by Taylor & Francis in Spectroscopy Letters
- Vol. 19 (4) , 311-320
- https://doi.org/10.1080/00387018608069241
Abstract
Analysis of the N-H 1H-NMR chemical shifts of the bis-pro-pionate ions of bilirubin IXα and XIIIα reveals a preference in CDCl3 and d6-DMSO for folded conformations in which the propionate groups are intramolecularly H-bonded to the opposing pyrromethenone units.Keywords
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