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Characterization of Quinoxolinol Salen Ligands as Selective Ligands for Chemosensors for Uranium
Author(s) -
DeVore II Michael A.,
Kerns Spencer A.,
Gorden Anne E. V.
Publication year - 2015
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.201501033
Subject(s) - bathochromic shift , hypsochromic shift , chemistry , ligand (biochemistry) , uranyl , photochemistry , metal , inorganic chemistry , metal ions in aqueous solution , fluorescence , ion , organic chemistry , receptor , biochemistry , physics , quantum mechanics
Quinoxalinol salen ligands have been characterized as selective ligands for the rapid identification of uranyl. The absorption maximum of ligand 1 presented a hypsochromic (blue) shift with the addition of UO 2 2+ (as the acetate salt), and a bathochromic (red) shift in the presence of Cu 2+ or Co 2+ acetate salts, resulting in distinct, visible color changes for all three metal ions. The absorption maximum of ligand 2 was not observed to change with the addition of UO 2 2+ ; however, it does present a bathochromic shift with the addition of Cu 2+ , and a hypsochromic shift with Co 2+ added. Using TDDFT calculations, it was demonstrated that the hypsochromic shift for UO 2 2+ ion complexation with ligand 1 is caused by a ligand‐to‐metal charge transfer, while the bathochromic shift observed with Cu 2+ ion addition was caused by a metal‐to‐ligand charge transfer. Finally, it was found that the addition of Cu 2+ (as metal salts) to either ligand resulted in rapid, complete quenching of the ligand fluorescence.