Title

STRUCTURE AND CONFORMATION OF PHOTOSYNTHETIC PIGMENTS AND RELATED COMPOUNDS 7. ON THE CONFORMATION OF THE METHYL ESTER OF (20‐METHYLPHYTOCHLORINATO)NICKEL(II)‐A BAaERIOCHLOROPHYLL c MODEL COMPOUND

Document Type

Article

Publication Date

1-1-1994

Abstract

Abstract The crystal and molecular structure of the title compound 4 have been determined by single crystal X‐ray crystallography. The structure shows the typical S,‐ruffled conformation observed for Ni(II) tetrapyrroles. Compared to the structure of the methyl ester of (132‐demethoxycarbonyl‐pheophorbidato a)nickel(II), 4 shows a smaller Ca‐Cm‐Cm angle and a higher degree of conformational distortion at the methyl‐substituted C20 position. This local distortion of the macrocycle might account for the bathochromic shifted absorption spectra of the bacteriochlorophylls c compared to the d‐series. Crystal data: C35H38N4NiO3; tetragonal, P43212, a = 15.335(7) Å, c = 25.11(2) Å, V = 5904, Z = 8, λ(Mo Kα) = 0.71069 Å, μ= 0.701 mm−1, P(000) = 2624, 130 K, R = 0.058 for 5700 reflections with F > 4.0σ(F). Copyright © 1994, Wiley Blackwell. All rights reserved

Publication Source (Journal or Book title)

Photochemistry and Photobiology

First Page

139

Last Page

142

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