Synthetic Pathway, Structural Chemistry and Structural Elucidation Based Upon Spectral Studies [IR, NMR (1Η, 13C and 119Sn)] of Some Mixed Ligand Complexes of Diorganotin (IV) Derived from Sterically Demanding Heterocyclic ß-Diketones and N-Protected Amino Acids.

A series of new mixed ligand diorganotin (IV) complexes of general formula Bu 2 SnLA [where LH = RCOC:C(OH)N(C 6 H 5 )N:CCH 3 ; R = -C 6 H 5 , -C 2 H S , -CH, and AH = C(0)C 6 H 4 C(0)NCH R'COOH; R' = -H, -CH,, -CH(CH,) 2 , -CH 2 C 6 H 5 , -CHR' = -CH 2 CH 2 -was synthesized by the interaction of dibutyltin (IV) dichloride with the corresponding ligands in the presence of triethylamine in 1:1:1:2 molar ratios in dry refluxing benzene solution.The plausible structures of these newly synthesized complexes have been proposed on the basis of physico-chemical and spectral studies.The central tin atom is bonded by heterocyclic ß-diketone and N-protected amino acid ligands.The ll9 Sn NMR spectral studies of some of these complexes reveal the presence of hexacoordinated tin centres in these complexes.