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- Title
Optical and electrochemical characteristics of Ir(III) complexes with metalated 4-(4-bromophenyl)-2-methyl-1,3-thiazole and isocyanide, ethylenediamine, and diethyldithiocarbamate ligands.
- Authors
Katlenok, E.; Kinzhalov, M.; Eremina, A.; Balashev, K.
- Abstract
The influence of donor-acceptor properties of tert-butyl-, 2.6-dimethylphenyl-, and 4-bromophenyl-isocyanides (BuNC, XylNC, BpNC), ethylenediamine (En), and diethyldithiocarbamate ions (Dtc-) on the H and C NMR, IR, optical, and electrochemical characteristics of Ir(III) complexes with metalated 4-(4-bromophenyl)-2-methyl-1,3-thiazole is studied. Enhancement of the donor properties of BpNC, XylNC, BuNC, En, and Dtc ligands leads to a bathochromic shift of metal-to-ligand charge transfer (MLCT) bands and to a decrease in the difference between the one-electron oxidation and reduction potentials of complexes. The bathochromic shift of the low-temperature phosphorescence of complexes in frozen (77 K) solutions with increasing donor properties of BpNC, XylNC, BuNC, En, and Dtc-ligands is caused by a decrease in the admixture of MLCT to the intraligand excited state of {Ir(bptz)}. Quenching of the phosphorescence of complexes in liquid solutions is attributed to the thermally-induced population of excited d- d* states with subsequent nonradiative deactivation.
- Subjects
ELECTROCHEMISTRY; IRIDIUM compounds; METAL complexes; THIAZOLES; ISOCYANIDES; ETHYLENEDIAMINE; DIETHYLDITHIOCARBAMATE; LIGANDS (Chemistry)
- Publication
Optics & Spectroscopy, 2017, Vol 122, Issue 5, p723
- ISSN
0030-400X
- Publication type
Article
- DOI
10.1134/S0030400X17050113