Di-n-butyltin(IV) complexes derived from heterocyclic β-diketones and N-phthaloyl amino acids:: Preparation, biological evaluation, structural elucidation based upon spectral [IR, NMR (1H, 13C, 19F and 119Sn)] studies

Stable, six coordinated Bu(2)SnLA type complexes have been prepared [where LH = RCOC:C(OH)N(C6H5)N:CCH3; R = -4-F-C6H4-((LH)-H-1), R = -4-Cl-C6H4-((LH)-H-2), R= -4-Br-C6H4-((LH)-H-3), R= -CF3((LH)-H-4) and AH = (O)C6H4C(O)NCHR'COOH; R'= -H(A(1)H), -CH3(A(2)H), -CH(CH3)(2)(A(3)H)] by the interaction of 1:1:1 molar ratios of di-n-butyltin(IV) dichloride with corresponding organic moieties in refluxing benzene using two moles of Et3N as a base. In these complexes LH and A-H behave as bidentate and coordination is taking place through oxygen, this is inferred from IR and C-13 NMR studies. These complexes possess tin atoms in skew trapezoidal bipyramidal geometry with the C-Sn-C angles ranging from 149.88 degrees to 156.84 degrees. Some of these complexes with their corresponding organic moieties (LH AH) were tested for their antimicrobial activities.