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Ligand‐Tuning of the Excitation Wavelength of a Solid state E/Z Isomerization: [Zn(TA) 2 (2,2′‐Bipyridyl)] in a Supramolecular Framework
Author(s) -
Zheng ShaoLiang,
Gembicky Milan,
Messerschmidt Marc,
Coppens Philip
Publication year - 2009
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200900002
Subject(s) - chemistry , photoisomerization , isomerization , supramolecular chemistry , intramolecular force , ligand (biochemistry) , photosensitizer , photochemistry , excitation , crystallography , excitation wavelength , quantum yield , single crystal , crystal structure , stereochemistry , fluorescence , catalysis , organic chemistry , receptor , biochemistry , electrical engineering , engineering , physics , quantum mechanics
The single‐crystal‐to‐single‐crystal (SCSC) E ŕ Z photoisomerization of TA in the supramolecular solid CECR‐[Zn(TA) 2 (bpy)]·H 2 O (CECR = C ‐ethylcalixresorcinarene, HTA = tiglic acid, and bpy = 2,2′‐bipyridine, is induced by 458 nm light, indicating a red‐shift of the photo‐active wavelength on introduction of the aromatic bpy ligand compared with the previously studied reaction of CECR‐[Zn(TA) 2 (H 2 O) 2 ] 4H 2 O. Theoretical calculations show that the initial excitation involves the bipyridyl ligand, which acts as an intramolecular photosensitizer for the isomerization process. The reaction is topotactic and illustrated by photodifference maps.