Molecular structure and spectroscopy of a bacteriopurpurin. A new class of bacteriochlorin photosensitizers
Article Abstract:
The synthesis, spectral characterization and structural determination of a metal-free bacteriopurpurin, a paradigm for a new class of photosensitizers comprised of porphyrins at the saturation level of bacteriochlorins flanked by two annelated, exocyclic rings were reported. A very red-shifted Qy transition at 843 nm was exhibited by the molecule asn was readily oxidized to a pi cation radical with a distinctive EPR signal. The first stereochemical parameters for this new class of expanded bacteriochlorins was provided by the crystallographic results for bacteriopurpurin.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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Supramolecular structures of the chlorophyll a' aggregate and the origin of the diastereoselective separation of chlorophyll a and a'
Article Abstract:
The supramolecular structure of the aggregate chlorophyll a' (Chl a') was examined in comparison with that of the Chl a aggregate in aqueous alcohol solutions. Infrared, resonance Raman and small-angle X-ray scattering measurements were performed on lyophilized precipitates of the aggregate colloids. The difference between the supramolecular structures of the Chl a and a' aggregates does not depend on the steric hindrance between the bulky substituents at the C13 2 and C17 positions but on the potential for forming rigid intermolecular hydrogen bonding networks.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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