Structural and spectroscopic characterisation of the mixed valence platinum complex PtdabI3 (dab=o-diaminobenzene)

The new mixed valence platinum complex PtdabI3 (dab=o-diaminobenzene) (1) has been prepared and characterised. The crystal structure consists of separate units of planar Pt(II)dabI2 and octahedral Pt(IV)dabI4 molecules. The latter are arranged in linear chains with rather short intermolecular I⋯I-contacts (3.478 Å) which are responsible for charge transfer interactions. In the resonance Raman spectrum strong intensity enhancements and extended overtone progressions of the symmetric I–Pt–I stretching mode have been observed.