Formation and spectral characterisation of N,Nt́-disubstituted-oxamide [O O], -thiooxamide [S S] and -malonamide [O O] complexes with titanium(IV) and Tin(IV) chlorides

Add time:08/30/2019    Source:sciencedirect.com

Several complexes of the type MCl4·B [M = Ti, Sn; B = N,Nt́-dimethyloxamide (DMO), N,Nt́-dimethylmalonamide (DEM), N,Nt́-dimethyldithiooxamide (DMDTO), N,Nt́-diethyldithiooxamide (DEDTO); M = Ti, B = N,Nt́-diethyloxamide (DEO)] have been prepared and characterised. Consideration of their IR and NMR spectral data allows an evaluation of the type of ligand attachment. In each case chelation involving either [O O] or the corresponding S S] coordination to the metal is discussed. The complexes are covalent. Where direct comparison is possible it appears that the S] donors are more strongly bonded to the metal than the corresponding O donors.

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