Photoinduced energy-transfer in covalently and non-covalently linked supramolecular arrays of metal polypyridyl complexes
Photoinduced energy-transfer has been studied between the component parts of two types of multichromophoric array. In the first type the components (metal polypyridyl complexes) are covalently linked by using the bridging ligand 2,2′:3′,2″:6″,2′″-quaterpyridine, which has two inequivalent bipyridyl...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
1999-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X99000227 |
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| Summary: | Photoinduced energy-transfer has been studied between the component parts of two types of
multichromophoric array. In the first type the components (metal polypyridyl complexes) are covalently
linked by using the bridging ligand 2,2′:3′,2″:6″,2′″-quaterpyridine, which has two inequivalent bipyridyl
chelating sites in close proximity. Structural, redox and photophysical studies of the complexes based on this
ligand show how the properties of each metal fragment vary between the two inequivalent binding sites, and
show also how efficient inter-component energy transfer can occur between components, with an example
of the antenna effect being demonstrated by energy transfer from three peripheral {Re(bipy)(CO)3CL}
fragments
to one central {Ru(bipy)3}2+ fragment. In the second type of supramolecular array, the mononuclear
complex component parts are held together by hydrogen-bonding between peripheral adenine, thymine,
cytosine or guanine nucleobase groups. Thus a {Ru(bipy)3}2+ derivative with a pendant cytosine group
strongly associates in CH2CL2 solution with an {Os(bipy)3}2+ complex bearing a pendant guanine group,
by Watson-Crick base-pair formation (Ka≈5000M-1), and Ru→Os photoinduced energy-transfer can occur
across the triple hydrogen-bonded bridge. |
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| ISSN: | 1110-662X |