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Modulation of Photochemical Properties in Ion‐Controlled Multicomponent Dynamic Devices
Author(s) -
Barboiu Mihail,
Legrand YvesMarie,
Prodi Luca,
Montalti Marco,
Zaccheroni Nelsi,
Vaughan Gavin,
van der Lee Arie,
Petit Eddy,
Lehn JeanMarie
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200900089
Subject(s) - chemistry , terpyridine , supramolecular chemistry , fluorescence , zinc , ligand (biochemistry) , absorption spectroscopy , ion , absorption (acoustics) , ionic bonding , photochemistry , spectroscopy , titration , fluorescence spectroscopy , crystal structure , crystallography , inorganic chemistry , metal , organic chemistry , biochemistry , physics , receptor , quantum mechanics , acoustics
A bis‐pyrenyl‐terpyridine ligand 1 has been synthesised and used to prepare zinc homo‐ and heterocomplexes and their photophysical properties have been studied. Fluorescence titrations displayed modulation of absorption and emission, depending on the molarities of the ionic species (Zn 2+ , H + ). Two single‐crystal structures give insights into the formation of multicomponent supramolecular networks, also present in solution as shown by NMR and ESI‐MS spectroscopy. NMR spectroscopy revealed fast exchanges of the ligands complexed around the metal ion, which could be reduced at lower temperature. Conformational (from W to U shape) and photophysical changes of the flexible ligand were demonstrated in the solid and liquid phases. Addition of zinc ions to the solution of ligands changes the absorption and fluorescence spectra noticeably. The zinc complexes do not form exciplexes; the fluorescence is mainly due to charge‐transfer transitions. The present work illustrates the potential use of ion‐triggered switches to generate mechanical motions that can be followed photophysically.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)