Journal
NEW JOURNAL OF CHEMISTRY
Volume 35, Issue 1, Pages 76-88Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0nj00652a
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Funding
- Division of Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-FG02-05ER15660, DE-FG02-05ER15661, DE-FG02-96ER14632]
- North Carolina Biotechnology Center
- National Science Foundation
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Understanding the effects of substituents on natural photosynthetic pigments is essential for gaining a deep understanding of why such pigments were selected over the course of evolution for use in photosynthetic systems. This knowledge should provide for a more thoughtful design of artificial light-harvesting systems. The hydrocarbon skeleton of all chlorophylls is phorbine, which contains an annulated five-membered (isocyclic) ring in addition to the reduced pyrrole ring characteristic of chlorins. A phorbine and a 13(1)-oxophorbine (which bears an oxo group in the isocyclic ring) were synthesized as benchmark molecules for fundamental spectral and photophysical studies. The phorbine and 13(1)-oxophorbine macrocycles lack peripheral substituents other than a geminal dimethyl group in the reduced ring to stabilize the chlorin chromophore. The spectral properties and electronic structure of the zinc or free base 13(1)-oxophorbine closely resemble those of the corresponding analogues of chlorophyll a. Accordingly, the fundamental electronic properties of chlorophylls are primarily a consequence of the 13(1)-oxophorbine base macrocycle.
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