TIN(IV) AND ORGANOTIN(IV) COMPLEXES CONTAINING THE ANION OF SOME SUBSTITUTED-3-METHYL-4-ACYL-5-PYRAZOLONES - CRYSTAL-STRUCTURE OF DIMETHYLBIS(1-PHENYL-3-METHYL-4-BENZOYL PYRAZOLON-5-ATO)TIN(IV)

Six-coordinate [(Q)2SnRX] compounds, where QH is 1-R'-3-methyl-4-R''C( O)-5-pyrazolone (Q(P)H: R'=p-NO2-C6H4, R''- C6H5; Q(M)H: R' = CH3, R'' = C6H5; Q(F)H: R'- C6H5, R'' = CF3), X - Cl or R, R = Cl or CH3, have been prepared and characterized by analyses, spectral (IR, H-1-, C-13 - and Sn-119-NMR data) and conductivity measurements. The crystal stru cture of [(Q')2Sn(CH3)2] (Q'H is 1-phenyl-3-methyl-4-benzoyl-5-pyrazol one) was also determined: the sterically demanding ligand gives rise t o severe distortion of the six-coordinate [(Q')2Sn(CH3)2] compound, si milar to that noted in [(Q')2Sn(t-C4H9)2] and [(Q')2Sn(n-C4H9)2]. The C-Sn-C axis is bent (153.3(3)) and two of the four Sn-0 bonds are exce ptionally long (2.337(4) and 2.412(4) angstrom) whereas the other two Sn-O bonds are normal (2.104(3) and 2.103(4) angstrom).