Research output: Contribution to journal › Article › peer-review
Optical and electrochemical characteristics of Ir(III) complexes with metalated 4-(4-bromophenyl)-2-methyl-1,3-thiazole and isocyanide, ethylenediamine, and diethyldithiocarbamate ligands. / Katlenok, E. A.; Kinzhalov, M. A.; Eremina, A. A.; Balashev, K. P.
In: Optics and Spectroscopy (English translation of Optika i Spektroskopiya), Vol. 122, No. 5, 05.2017, p. 723-728.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Optical and electrochemical characteristics of Ir(III) complexes with metalated 4-(4-bromophenyl)-2-methyl-1,3-thiazole and isocyanide, ethylenediamine, and diethyldithiocarbamate ligands
AU - Katlenok, E. A.
AU - Kinzhalov, M. A.
AU - Eremina, A. A.
AU - Balashev, K. P.
PY - 2017/5
Y1 - 2017/5
N2 - 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.
AB - 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.
KW - LIGHT-EMITTING DEVICES
KW - IRIDIUM COMPLEXES
KW - EXCITED-STATES
KW - PHOSPHORESCENT
KW - RHODIUM(III)
U2 - 10.1134/S0030400X17050113
DO - 10.1134/S0030400X17050113
M3 - статья
VL - 122
SP - 723
EP - 728
JO - OPTICS AND SPECTROSCOPY
JF - OPTICS AND SPECTROSCOPY
SN - 0030-400X
IS - 5
ER -
ID: 28180441