Ligand-field excited states of hexacyanochromate and hexacyanocobaltate as sensitisers for near-infrared luminescence from Nd(iii) and Yb(iii) in cyanide-bridged d–f assemblies

2007 ◽  
Vol 6 (11) ◽  
pp. 1152 ◽  
Author(s):  
Theodore Lazarides ◽  
Graham M. Davies ◽  
Harry Adams ◽  
Cristiana Sabatini ◽  
Francesco Barigelletti ◽  
...  
Keyword(s):  
Excited States ◽  
Near Infrared ◽  
Ligand Field ◽  
Infrared Luminescence

Quantum yield of singlet dioxygen and elucidation of the quenching mechanism for the reaction between the doublet excited states of tris(bipyridine)chromium(III) and triplet dioxygen

1996 ◽  
Vol 74 (3) ◽  
pp. 336-340 ◽  
Author(s):  
Acharee Tiyabhorn ◽  
K. Omar Zahir
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Excited States ◽  
Near Infrared ◽  
Deuterium Oxide ◽  
Quenching Mechanism ◽  
Intensity Measurements ◽  
Infrared Luminescence ◽  
A Value ◽  
A Minor

The formation of singlet dioxygen (1O2) in the reaction between the doublet excited states of tris(bipyridine)chromium(III) and triplet dioxygen in deuterium oxide was detected using near-infrared luminescence corresponding to singlet dioxygen decay. In addition, luminescence intensity measurements were used to determine the quantum yield of singlet dioxygen produced. A value of 0.86 ± 0.08 was obtained for the yield of 1O2. Based on these quantum yield measurements, it is proposed that the major quenching mode is energy transfer quenching. However, considering that the 1O2 yield is less than unity and electron transfer quenching is not a viable pathway, it is proposed that, in addition to the energy transfer quenching, physical quenching involving spin-catalyzed deactivation of Cr(bpy)33+ may also be operative as a minor quenching pathway. Key words: Cr(bpy)33+, singlet dioxygen, quenching, quantum yield.

The Character of Low-Lying Excited States of Mixed-Ligand Metal Carbonyls. TD-DFT and CASSCF/CASPT2 Study of [W(CO)4L] (L = ethylenediamine, N,N'-dialkyl-1,4-diazabutadiene) and [W(CO)5L] (L = pyridine, 4-cyanopyridine)

2003 ◽  
Vol 68 (1) ◽  
pp. 89-104 ◽  
Author(s):  
Stanislav Záliš ◽  
Antonín Vlček ◽  
Chantal Daniel
Keyword(s):  
Excited States ◽  
Substitution Effect ◽  
Electronic Transitions ◽  
Ligand Field ◽  
Metal Carbonyls ◽  
Electron Density Redistribution ◽  
Time Resolved ◽  
Model Complex ◽  
Td Dft ◽  
Time Resolved Infrared Spectroscopy

This contribution presents the results of the TD-DFT and CASSCF/CASPT2 calculations on [W(CO)4(MeDAB)] (MeDAB = N,N'-dimethyl-1,4-diazabutadiene), [W(CO)4(en)] (en = ethylenediamine), [W(CO)5(py)] (py = pyridine) and [W(CO)5(CNpy)] (CNpy = 4-cyanopyridine) complexes. Contrary to the textbook interpretation, calculations on the model complex [W(CO)4(MeDAB)] and [W(CO)5(CNpy)] show that the lowest W→MeDAB and W→CNpy MLCT excited states are immediately followed in energy by several W→CO MLCT states, instead of ligand-field (LF) states. The lowest-lying excited states of [W(CO)4(en)] system were characterized as W(COeq)2→COax CT excitations, which involve a remarkable electron density redistribution between axial and equatorial CO ligands. [W(CO)5(py)] possesses closely-lying W→CO and W→py MLCT excited states. The calculated energies of these states are sensitive to the computational methodology used and can be easily influenced by a substitution effect. The calculated shifts of [W(CO)4(en)] stretching CO frequencies due to excitation are in agreement with picosecond time-resolved infrared spectroscopy experiments and confirm the occurrence of low-lying M→CO MLCT transitions. No LF electronic transitions were found for either of the complexes studied in the region up to 4 eV.

Strategy for Achieving Long-Wavelength Near-Infrared Luminescence of Diimineplatinum(II) Complexes

2021 ◽  
Author(s):  
Meng-Meng Su ◽  
Jia-Jia Kang ◽  
Shu-Qin Liu ◽  
Chang-Gong Meng ◽  
Yan-Qin Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Long Wavelength ◽  
Infrared Luminescence

Efficient Red and Broadband Near‐infrared Luminescence in Mn 2+ /Yb 3+ doped Phosphate Phosphor

2021 ◽  
Author(s):  
Langping Dong ◽  
Liang Zhang ◽  
Yonghui Xu ◽  
Shuwen Yin ◽  
Hongpeng You
Keyword(s):  
Near Infrared ◽  
Infrared Luminescence

Sensitized near-infrared luminescence from polydentate triphenylene-functionalized Nd3+, Yb3+, and Er3+ complexes

1999 ◽  
Vol 86 (3) ◽  
pp. 1181-1185 ◽  
Author(s):  
S. I. Klink ◽  
G. A. Hebbink ◽  
L. Grave ◽  
F. C. J. M. Van Veggel ◽  
D. N. Reinhoudt ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Luminescence
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