Title
STRUCTURE and CONFORMATION OF PHOTOSYNTHETIC PIGMENTS and RELATED COMPOUNDS. 2. NICKEL (II) METHYL PYROPHEOPHORBIDE a–A SEVERELY ISTORTED CHLOROPHYLL DERIVATIVE
Document Type
Article
Publication Date
1-1-1991
Abstract
The crystal structure of Ni(II) methyl pryopheophorbide a (3) (CMH34N4Ni03, Mu= 605.4) was determined by x‐ray diffraction methods in order to determine the influence of the nickel‐ion on the ring conformation. The crystals were blue octahedrons and crystallized in the tetragonal space group P4121,2 with a= 14.727(4) Å, c = 26.666(12) Å, V= 5781(3) Å3Z= 8, D= 1.391 mg/m3. (Mo Kα) = 0.71069 Åμ= 0.713 mm−1, F(000) = 2544, 130 K. The final R value was 0.064 for 4096 observed reflections, wR = 0.065. The molecule is severely distorted and shows a saddle‐shaped ring conformation, the β‐pyrrole atoms being displaced up to 0.6 A out of the plane of the nitrogens. The severe deformation restricts the use of Ni‐derivatives in spectroscopic model studies on chlorophylls and provides an example for the conformational flexibility of the phorbin macrocycle. Copyright © 1991, Wiley Blackwell. All rights reserved
Publication Source (Journal or Book title)
Photochemistry and Photobiology
First Page
841
Last Page
846
Recommended Citation
Senge, M., & Smith, K. (1991). STRUCTURE and CONFORMATION OF PHOTOSYNTHETIC PIGMENTS and RELATED COMPOUNDS. 2. NICKEL (II) METHYL PYROPHEOPHORBIDE a–A SEVERELY ISTORTED CHLOROPHYLL DERIVATIVE. Photochemistry and Photobiology, 54 (5), 841-846. https://doi.org/10.1111/j.1751-1097.1991.tb02099.x