TRIPHENYLTIN DERIVATIVES OF ISOTHIAZOL-3(2H)-ONE 1,1-DIOXIDES - SYNTHESIS, MOSSBAUER-SPECTRA, SOME FUNGITOXICITY DATA, AND CRYSTAL-STRUCTURE OF TRIPHENYLSTANNYL 1,2-BENZISOTHIAZOL-3(2H)-ONE 1,1-DIOXIDE.N,N-DIMETHYLFORMAMIDE

The syntheses and tin-119m Mossbauer spectroscopic data are reported for two series of stannylimides, 2-triphenylstannyl 1,2-benzisothiazol-3(2H)-one 1,1-dioxide.L (L = O-donar ligand) and 2-tri-phenylstannyl 4,5-substituted isothiazol-3(2H)-one 1,1-dioxides, and for the stannylester, triphenyltin 1,2-benzisothiazol-3(2H)-onyl-2-acetate 1,1-dioxide. The observed quadrupole splitting (QS) values (3.12-3.25 mm s-1) are interpreted in terms of trans-C3SnNO trigonal bipyramidal structures for the (C6H5)3Sn activated NC(O)C6H4SO2.L [L = (C6H5)2C2CO, (CH3)2NCHO, C9H7NO, (C6H5CH2)2SO, (C6H5)3PO, (C6H5)3AsO] adducts. A crystal structure determination of the N,N-dimethylformamide adduct confirms the Mossbauer assignment. The ipso-carbons [Sn-C 2.120(4), 2.120(5), 2.122(5) angstrom] comprise the equatorial girdle of the trigonal bipyramid, the apical positions being occupied by the imido nitrogen [Sn-N 2.242(5) angstrom] and amido oxygen [Sn-O 2.402(5) angstrom] atoms. A similar five-coordinate structure is assigned to (C6H5)3Sn activated NC(O)C(R')C(R")SO2 [QS 2.95-3.32 mm s-1; R' = R" = CH3; R' = H, R" = C6H5; R'R" = -(CH2)4-; R'R" = -(CH2)5-], but for the R' = CH3, R" = C6H5 derivative, the lower QS value (2.54 mm s-1) is more consistent with a four-coordinate tetrahedral structure. A trans-C3SnO2 trigonal bipyramidal structure for the (C6H5)3SnO2CCH2 activated NC(O)C6H4SO2 stannylester is indicated by its large QS (3.53 mm s-1). Results on fungitoxicity tests on some of the triphenyltin compounds are presented.