6533b86efe1ef96bd12cb447
RESEARCH PRODUCT
Syntheses and properties of tetrathio- and tetraseleno metalates [(C5Me4R)2NbE2]2M (E=S, Se; M=Cr, Mo; R=Me, Et) with peripheric niobocene ligands
Marek M. KubickiBernhard StubenhoferJoachim WachterOlivier BlacqueHenri BrunnerDominique LucasBernd NuberYves MugnierWalter Meiersubject
10120 Department of ChemistryElectron density1303 BiochemistryAbsorption spectroscopy1604 Inorganic ChemistryOrganic Chemistrychemistry.chemical_elementElectrochemistryBiochemistrySulfurTolueneRedoxInorganic ChemistryCrystallographychemistry.chemical_compoundchemistry540 ChemistryMaterials ChemistryPhysical and Theoretical Chemistry1606 Physical and Theoretical Chemistry2505 Materials Chemistry1605 Organic Chemistrydescription
Abstract Reactions of Cp*2Nb(η2-S2)H 1 (Cp*=C5Me5 (a), C5Me4Et (b)) and Cp*2Nb(η2-Se2H) 3 with 0.5 equivalents of M(CO)6 (M=Cr, Mo) in boiling toluene give the CO free complexes [Cp*2NbE2]2M 4–7. X-ray diffraction analyses have been carried out for the Mo complexes 5a (E=S) and 7a (E=Se) showing that the structures contain ME4 tetrahedral cores with two attached niobocene ligands thus forming a nearly linear trimetallic unit. Absorption spectra and electrochemical studies of complexes 4–7 are described. Characteristic of the novel CrSe4 chromophor are four reversible one electron redox steps. Chemical oxidation of 4a and 5a with [(C5H5)2Fe]PF6 gives the salts {[Cp*2NbS2]2M}PF6 (M=Cr, Mo) 10 and 11. A qualitative EHMO analysis provides evidence for a strong delocalisation of electron density over the whole metal–ligand system.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-08-01 |