TIN(IV) DERIVATIVES OF ANIONIC 4-ACYL-5-PYRAZOLONATO LIGANDS - SYNTHESIS, SPECTROSCOPIC CHARACTERIZATION (IR, FAR-IR, SN-119 MOSSBAUER, H-1, C-13 AND SN-119 NMR) AND BEHAVIOR IN SOLUTION - CRYSTAL AND MOLECULAR-STRUCTURE OF YL-METHYL-4-(BROMOBENZOYL)-PYRAZOLON-5-ATO]TIN(IV)

Stable six-coordinate tin(IV) and organotin(IV) derivatives X(2)SnQ(2) (X = Me, Ph, benzyl, cyclohexyl, Cl or (1)Bu) (QH = 1-R'-3-methyl-4-R ''(C = O)-pyrazol-5-one in general; in detail Q'H: R' = C6H5, R '' = C6H5; Q '' H: R' = C6H5, R '' = CH3; Q(A)H: R' = C6H5, R '' = p-CH3O-C 6H4; Q(Br)H: R' = C6H5, R '' = p-Br-C6H4) have been synthesized and ch aracterized by analysis and spectral (IR and far-IR, H-1, C-13 and Sn- 119 NMR, Sn-119 Mossbauer) data, Structural predictions were derived f rom Sn-119 NMR parameters such as (1)J((119Sn-13C)), (2)J((119Sn-1H)) and delta(Sn-119). The diffraction study of the complex [Ph(2)Sn(Q(Br) )(2)] shows the metal to be six-coordinate in a skewed trapezoidal bip yramidal geometry; Sn-O distances are 2.12(1) and 2.143(7) Angstrom, a nd 2.223(8) and 2.26(1) Angstrom and the Ph-Sn-Ph bond angle is 173.0( 7)degrees.