Inorganic photoisomerization: the case study of rhenium(I) complexes
The mechanism of photoisomerization of stilbene-like ligands coordinated to rhenium polypyridine or α-diimine carbonyls is deciphered in the light of recent theoretical results obtained at various levels of theory, density functional theory (DFT, time-dependent DFT) and state-of-the-art ab initio me...
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| Published in: | Dalton transactions : an international journal of inorganic chemistry Vol. 41; no. 42; p. 13191 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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England
14.11.2012
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| ISSN: | 1477-9234, 1477-9234 |
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| Abstract | The mechanism of photoisomerization of stilbene-like ligands coordinated to rhenium polypyridine or α-diimine carbonyls is deciphered in the light of recent theoretical results obtained at various levels of theory, density functional theory (DFT, time-dependent DFT) and state-of-the-art ab initio methods, complete active space self-consistent field (CASSCF) and multi-state CAS perturbation theory 2nd Order (MS-CASPT2). On the basis of the electronic absorption spectra and potential energy profiles (PEF) associated to the low-lying singlet and triplet intra-ligand (IL) and metal-to-ligand-charge-transfer (MLCT) excited states, coupled by spin-orbit interactions and calculated for the series [Re(CO)(3)(N,N)(L)](+) with N,N = bpy, phen and ph(2)phen (bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline; ph(2)phen = 4,7-diphenyl-1,10-phenanthroline) and L = stpy or bpe (stpy = 4-styrylpyridine; bpe = 1,2-bis(4-pyridylethylene) it is shown that the dynamics of the isomerization process are controlled by several features: (i) the occurrence of a (1)IL(L)/(1)MLCT(NN) conical intersection in the vicinity of the (1)MLCT(NN) absorption domain (ii) the kinetics of (1)MLCT(NN)/(3)MLCT(NN) intersystem crossings; (iii) the kinetics of (3)MLCT(NN)/(3)IL(L) internal conversion. The branching ratio between the two main isomerization pathways, namely along the (1)IL(L) PEF via(1)MLCT(NN)/(1)IL(L) internal conversion at the conical intersection or along the (3)IL(L) PEF after (3)MLCT(NN)/(3)IL(L) charge transfer is largely influenced by the nature of the N,N antenna and L isomerizable ligands. |
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| AbstractList | The mechanism of photoisomerization of stilbene-like ligands coordinated to rhenium polypyridine or α-diimine carbonyls is deciphered in the light of recent theoretical results obtained at various levels of theory, density functional theory (DFT, time-dependent DFT) and state-of-the-art ab initio methods, complete active space self-consistent field (CASSCF) and multi-state CAS perturbation theory 2nd Order (MS-CASPT2). On the basis of the electronic absorption spectra and potential energy profiles (PEF) associated to the low-lying singlet and triplet intra-ligand (IL) and metal-to-ligand-charge-transfer (MLCT) excited states, coupled by spin-orbit interactions and calculated for the series [Re(CO)(3)(N,N)(L)](+) with N,N = bpy, phen and ph(2)phen (bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline; ph(2)phen = 4,7-diphenyl-1,10-phenanthroline) and L = stpy or bpe (stpy = 4-styrylpyridine; bpe = 1,2-bis(4-pyridylethylene) it is shown that the dynamics of the isomerization process are controlled by several features: (i) the occurrence of a (1)IL(L)/(1)MLCT(NN) conical intersection in the vicinity of the (1)MLCT(NN) absorption domain (ii) the kinetics of (1)MLCT(NN)/(3)MLCT(NN) intersystem crossings; (iii) the kinetics of (3)MLCT(NN)/(3)IL(L) internal conversion. The branching ratio between the two main isomerization pathways, namely along the (1)IL(L) PEF via(1)MLCT(NN)/(1)IL(L) internal conversion at the conical intersection or along the (3)IL(L) PEF after (3)MLCT(NN)/(3)IL(L) charge transfer is largely influenced by the nature of the N,N antenna and L isomerizable ligands. The mechanism of photoisomerization of stilbene-like ligands coordinated to rhenium polypyridine or α-diimine carbonyls is deciphered in the light of recent theoretical results obtained at various levels of theory, density functional theory (DFT, time-dependent DFT) and state-of-the-art ab initio methods, complete active space self-consistent field (CASSCF) and multi-state CAS perturbation theory 2nd Order (MS-CASPT2). On the basis of the electronic absorption spectra and potential energy profiles (PEF) associated to the low-lying singlet and triplet intra-ligand (IL) and metal-to-ligand-charge-transfer (MLCT) excited states, coupled by spin-orbit interactions and calculated for the series [Re(CO)(3)(N,N)(L)](+) with N,N = bpy, phen and ph(2)phen (bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline; ph(2)phen = 4,7-diphenyl-1,10-phenanthroline) and L = stpy or bpe (stpy = 4-styrylpyridine; bpe = 1,2-bis(4-pyridylethylene) it is shown that the dynamics of the isomerization process are controlled by several features: (i) the occurrence of a (1)IL(L)/(1)MLCT(NN) conical intersection in the vicinity of the (1)MLCT(NN) absorption domain (ii) the kinetics of (1)MLCT(NN)/(3)MLCT(NN) intersystem crossings; (iii) the kinetics of (3)MLCT(NN)/(3)IL(L) internal conversion. The branching ratio between the two main isomerization pathways, namely along the (1)IL(L) PEF via(1)MLCT(NN)/(1)IL(L) internal conversion at the conical intersection or along the (3)IL(L) PEF after (3)MLCT(NN)/(3)IL(L) charge transfer is largely influenced by the nature of the N,N antenna and L isomerizable ligands.The mechanism of photoisomerization of stilbene-like ligands coordinated to rhenium polypyridine or α-diimine carbonyls is deciphered in the light of recent theoretical results obtained at various levels of theory, density functional theory (DFT, time-dependent DFT) and state-of-the-art ab initio methods, complete active space self-consistent field (CASSCF) and multi-state CAS perturbation theory 2nd Order (MS-CASPT2). On the basis of the electronic absorption spectra and potential energy profiles (PEF) associated to the low-lying singlet and triplet intra-ligand (IL) and metal-to-ligand-charge-transfer (MLCT) excited states, coupled by spin-orbit interactions and calculated for the series [Re(CO)(3)(N,N)(L)](+) with N,N = bpy, phen and ph(2)phen (bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline; ph(2)phen = 4,7-diphenyl-1,10-phenanthroline) and L = stpy or bpe (stpy = 4-styrylpyridine; bpe = 1,2-bis(4-pyridylethylene) it is shown that the dynamics of the isomerization process are controlled by several features: (i) the occurrence of a (1)IL(L)/(1)MLCT(NN) conical intersection in the vicinity of the (1)MLCT(NN) absorption domain (ii) the kinetics of (1)MLCT(NN)/(3)MLCT(NN) intersystem crossings; (iii) the kinetics of (3)MLCT(NN)/(3)IL(L) internal conversion. The branching ratio between the two main isomerization pathways, namely along the (1)IL(L) PEF via(1)MLCT(NN)/(1)IL(L) internal conversion at the conical intersection or along the (3)IL(L) PEF after (3)MLCT(NN)/(3)IL(L) charge transfer is largely influenced by the nature of the N,N antenna and L isomerizable ligands. |
| Author | Daniel, Chantal Kayanuma, Megumi Gindensperger, Etienne |
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