Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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-1 and C-13 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)(2)}. 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.
Язык оригинала | Английский |
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Страницы (с-по) | 723-728 |
Число страниц | 6 |
Журнал | Optics and Spectroscopy (English translation of Optika i Spektroskopiya) |
Том | 122 |
Номер выпуска | 5 |
DOI | |
Состояние | Опубликовано - мая 2017 |
ID: 28180441