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Issue 28, 2007
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Photogeneration of two metastable NO linkage isomers with high populations of up to 76% in trans-[RuCl(py)4(NO)][PF6]2·½H2O

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Abstract

Two light-induced metastable NO linkage isomers with oxygen-bound (SI) and side-on configuration (SII) of NO are generated in trans-[RuCl(py)4(NO)][PF6]2·½H2O. Irradiation by light in the blue–green spectral range (450–530 nm) leads to the population of SI. A further irradiation by near infrared light (920–1100 nm) transfers SI into SII at temperatures below 150 K. The heat release during the thermal decay of the linkage isomers shows that SI and SII are separated from the ground state (GS) by potential barriers of EA(SI) = 0.70(3) eV and EA(SII) = 0.38(3) eV, and are energetically situated at 1.42(6) eV and 1.07(7) eV above the ground state, respectively. Maximum populations of 76% for SI and of 56% for SII can be generated, as determined by the decrease of the ν(NO) stretching absorption band of the ground state. The ν(NO) stretching vibration shifts to lower energies by 143 cm−1 in SI and by 300 cm−1 in SII, indicating that the linkage isomers are of the same type as found in other octahedrally coordinated transition-metal nitrosyl complexes. The experimental observations are in agreement with results from calculations by the density functional theory, which predict that the metastable states correspond to a side-on bonded (SII) and an isonitrosyl (SI) configuration of the NO ligand. The calculations provide the energy minima of the ground state and the metastable states SI and SII as well as the saddle points along the reaction coordinate Q. This reaction coordinate corresponds to a rotation of the NO ligand by about 90° (SII) and 180° (SI), and therefore allows the comparison between observed and calculated activation energies.

Graphical abstract: Photogeneration of two metastable NO linkage isomers with high populations of up to 76% in trans-[RuCl(py)4(NO)][PF6]2·½H2O

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Publication details

The article was received on 29 Mar 2007, accepted on 11 May 2007 and first published on 30 May 2007


Article type: Paper
DOI: 10.1039/B704778A
Citation: Phys. Chem. Chem. Phys., 2007,9, 3717-3724
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    Photogeneration of two metastable NO linkage isomers with high populations of up to 76% in trans-[RuCl(py)4(NO)][PF6]2·½H2O

    D. Schaniel, B. Cormary, I. Malfant, L. Valade, T. Woike, B. Delley, K. W. Krämer and H. Güdel, Phys. Chem. Chem. Phys., 2007, 9, 3717
    DOI: 10.1039/B704778A

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