STUDIES IN ARYLTIN CHEMISTRY .8. STRUCTURES OF TETRAETHYLAMMONIUM DIBROMOTRIPHENYL(P-METHYLTHIOPHENYL)STANNATE(N) AND DIBROMOTRIS(P-METHYLTHIOPHENYL)STANNATE(IV)

(1) [N(C2H5)4][Sn(C6H5)3Br2], M(r) = 640.1, monoclinic, P2(1)/c, a = 10.594 (3), b = 13.838 (3), c = 20.077 (13) angstrom, beta = 113.55 (3)-degrees, V = 2698.1 (25) angstrom 3, Z = 4, D(x) = 1.576 Mg m-3, lambda(Cu K-alpha) = 1.54178 angstrom, mu = 11.3 mm-1, F(000) = 1272, T = 295 K, R = 0.038 for 3637 [I > 3-sigma(I)] reflections. (2) [N(C2H5)4][Sn(p-CH3SC6H4)3Br2], M(r) = 778.3, triclinic, P1, a = 9.208 (3), b = 13.138 (4), c = 13.562 (5) angstrom, alpha = 89.90 (3), beta = 82.77 (3), gamma = 85.31 (2)-degrees, V = 1622.1 (11) angstrom 3, Z = 2, D(x) = 1.594 Mg m-3, lambda(Cu K-alpha) = 1.54178 angstrom, mu = 11.3 mm-1, F(000) = 780, T congruent-to 295 K, R = 0.058 for 5205 [I > 3-sigma(I)] reflections. Both compounds have slightly distorted trigonal-bipyramidal anions with axial Br atoms. For (2), the differing torsion angles (CH3S-phenyl ring), -42.6 (7), 0.9 (7), -27.6 (8)-degrees indicate crystal-packing effects are predominant. The cations are disordered with occupancy factors, (1) 0.75:0.25 and (2) 0.80:0.20, for the two forms.