Journal
INORGANICA CHIMICA ACTA
Volume 359, Issue 12, Pages 3847-3854Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2006.04.036
Keywords
luminescence sensors; chromium complexes; heteroleptic compounds
Categories
Ask authors/readers for more resources
A series of new heteroleptic, tris(polypyridyl)chromium(III) complexes, [Cr(phen)(2)L](3+) (L = substituted phenanthrolines or bipyridines), has been prepared and characterized, and their photophyical properties in a number of solvents have been investigated. X-ray crystallography measurements confirmed that the cationic (3+) units contain only one ligand L plus two phenanthroline ligands. Electrochemical and photophysical data showed that both ground state potentials and lifetime decays are sensitive to ligand structure and the nature of the solvent with the exception of compounds containing L = 5-amino-1,10-phenanthroline (aphen) and 2,2'-bipyrimidine (bpm). Addition of electron-donating groups in the ligand structure shifts redox potentials to more negative values than those observed for the parent compound, [Cr(phen)(3)](3+). Emission decays show a complex dependence with the solvent. The longest lifetime was observed for [Cr(phen)(2)(dip)](3+) (dip = 4,7-diphenylphenanthroline) in air-free aqueous solutions, tau = 273 mu s. Solvent effects are explained in terms of the affinity of hydrophobic complexes for non-polar solvent molecules and the solvent microstructure surrounding chromium units. (c) 2006 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available