Preparation and characterisation of some stereochemically rigid 7-coordinate mono-methylcyclopentadienyl zirconium(IV) tris-N, N-dialkyl dithiocarbamate complexes

Add time:08/04/2019    Source:sciencedirect.com

Zirconium(IV) N,N-dialkyl dithiocarbamates of the type MeCnZr(S2CNR2)3 where R = Me, Et have been prepared by reaction of bis-methycyclopentadienyl zirconium(IV) dichloride with sodium salts of substituted dithiocarbamic acids in aqueous and non-aqueous media. They have also been prepared by reaction of mono-methycyclopentadienyl zirconium(IV) trichloride with sodium salts of substituted dithiocarbamic acids in non-aqueous medium. Molecular weight, conductance and IR studies point out that these complexes are monomeric non-electrolytes in which all of the dithiocarbamate ligands are bidentate. Therefore, a coordination number “7” may be assigned to zirconium(IV) ion in these compounds. Proton NMR spectra of these complexes in carbon disulfide or deuterated chloroform indicate that (i) there is hindered rotation about CN bonds at ambient temperature, and (ii) metal centered rearrangement is slow on the NMR time-scale at ambient temperature (30°C).

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