Copper(II) complexes of entwined 2,9-di(o-substituted phenyl)-1,10-phenanthroline type ligands and intramolecular quenching in copper(I) complexes |
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Authors: | Md Athar Masood Panthapally S Zacharias |
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Institution: | 1. School of Chemistry, University of Hyderabad, 500 134, Hyderabad, India
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Abstract: | Cu11 complexes of 1,10-phenanthroline, disubstituted at the 2 and 9 positions or monosubstituted at the 2 position by phenyl moieties
possessingortho substituents, were prepared and investigated by spectroscopic and electrochemical methods. The electronic spectral d-d band
position varies from 14 500 to 13 200 cm−1. E.s.r. g‖ values are between 2.256 to 2.283 and A‖ between 164 to 117×10−4 cm−1. Thebis2,9-di(o-substituted phenyl)-1,10-phenanthroline]Cu11 complexes undergo reversible one-electron electrochemical reduction (Cu11/Cu1) in the +0.536 to +0.825 V potential range versus s.c.e., whereas thebis2-mono(o-substituted phenyl)-1,10-phenanthroline]Cu11 complexes undergo reduction in the +0.360 to +0.405 V range; the redox couple is found to be quasireversible. Emission studies
on copper(I) complexes show that onlybis2,9-di(o-tolyl)-1,10-phen]Copper(I) complex exhibits emission properties. Emission behaviour of other structurally similar compounds
is explored.
TMC 2555 |
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