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Professor Holten’s research interests include the initial reactions of photosynthesis and photophysical studies of tetrapyrrole chromophores and arrays. The goals of his lab's photosynthesis research are to achieve a molecular-level understanding of charge separation in the bacterial reaction center and design of mutants that endow the reaction enter with properties not realized in nature. The goals of the tetrapyrrole research are to elucidate the electronic properties of natural and synthetic tetrapyrroles, address fundamental questions in energy and electron transfer, and tailor systems for a range of applications.
In the reaction center pigment-protein complex, light energy is converted into chemical potential energy by a series of fast electron transfers across the membrane from the photoexcited bacteriochlorophyll special dimer along a chain of electron acceptors on the photoactive A-branch with a quantum yield of ~1. His lab is studying mutants to (1) modulate the rate constants, yields and mechanisms of charge separation versus recombination at each step on both A and B branches, and (2) give electron transfer fully down the normally inactive B branch. The studies of tetrapyrrole chromophores (porphyrin, chlorin, bacteriochlorin) are aimed at elucidating the interplay between molecular composition, electronic structure, and photophysical properties. These properties include absorption and emission spectra and the rate constants and yields of the singlet excited-state decay pathways (fluorescence, internal conversion, intersystem crossing). Studies of multichromophore arrays probe fundamental aspects of energy and electron transfer including the potential effects of coherence phenomena. The collective studies provide insights and design principles that for constructing chromophores and arrays for use in solar-energy and life-sciences research.
In the reaction center pigment-protein complex, light energy is converted into chemical potential energy by a series of fast electron transfers across the membrane from the photoexcited bacteriochlorophyll special dimer along a chain of electron acceptors on the photoactive A-branch with a quantum yield of ~1. His lab is studying mutants to (1) modulate the rate constants, yields and mechanisms of charge separation versus recombination at each step on both A and B branches, and (2) give electron transfer fully down the normally inactive B branch. The studies of tetrapyrrole chromophores (porphyrin, chlorin, bacteriochlorin) are aimed at elucidating the interplay between molecular composition, electronic structure, and photophysical properties. These properties include absorption and emission spectra and the rate constants and yields of the singlet excited-state decay pathways (fluorescence, internal conversion, intersystem crossing). Studies of multichromophore arrays probe fundamental aspects of energy and electron transfer including the potential effects of coherence phenomena. The collective studies provide insights and design principles that for constructing chromophores and arrays for use in solar-energy and life-sciences research.
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Physical chemistry chemical physics : PCCPno. 19 (2024): 14228-14243
Science Advancesno. 1 (2022)
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