The ESR behaviour of [Ir(IV)(H)2(CI)2(P-i-Pr3)2] and [Ir(IV)(H)2(CI)2(PCy3)2], both in frozen solution and in the solid state is reported. At 1 10 K the frozen solution spectra of these highly distorted octahedral complexes permit the observation of weak, rhombic ESR signals with parameters close to the free electron g-value. In agreement with previous NMR data, these signals are ascribed to the low concentration of Ir(IV) present in solution. In the solid state the Ir(IV) complexes are responsible for a broad, featureless ESR line, whereas superimposed signals represent the initial stage of photoreaction involving reductive elimination of HCI and formation of a square-planar Ir(II) species.

Solution and solid state electron spin resonance properties of some dihydrido paramagnetic Ir(IV) complexes.

MALDOTTI, Andrea;SOSTERO, Silvana;TRAVERSO, Orazio
1992

Abstract

The ESR behaviour of [Ir(IV)(H)2(CI)2(P-i-Pr3)2] and [Ir(IV)(H)2(CI)2(PCy3)2], both in frozen solution and in the solid state is reported. At 1 10 K the frozen solution spectra of these highly distorted octahedral complexes permit the observation of weak, rhombic ESR signals with parameters close to the free electron g-value. In agreement with previous NMR data, these signals are ascribed to the low concentration of Ir(IV) present in solution. In the solid state the Ir(IV) complexes are responsible for a broad, featureless ESR line, whereas superimposed signals represent the initial stage of photoreaction involving reductive elimination of HCI and formation of a square-planar Ir(II) species.
1992
D., Attanasio; P., Mura; Maldotti, Andrea; Sostero, Silvana; Traverso, Orazio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1683283
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