POLYTOPAL ISOMERISM OF THE [CD(S(O)CPH)(3)](-) ANION

The CdS3 skeleton of the anion in monoclinic (Ph4P)[Cd(S{O}CPh)(3)] ha s a near-planar structure, but among the three crystallographically di fferent anions in the structure of rhombohedral (Ph4P)[Cd(S{O}CPh)(3)] there are both planar and uniquely pyramidal CdS3 skeletons. Thus, th e [Cd(S{O}CPh)(3)](-) anion provides a new example of polytopal isomer ism. [GRAPHICS] ents at room temperature. [GRAPHICS] clear organoalumi num compound {[AlMe2](3)[CH3C(CH2NH)(2)(CH2O)](2)Al} (1) and a trinucl ear compound (AlMe2)(2)AlMe[CH3C(CH2NH)(CH2O)(CH2SPh)] (2), respective ly. Both compounds were characterized by H-1 and C-13 NMR data, IR, an d mass and elemental analysis. Compound 1 was also characterized by si ngle-crystal X-ray diffraction analysis. Compound 1 crystallized in a tetragonal space group P4(1)2(1)2 (No. 92), with cell parameters a = 1 0.238(2) Angstrom, c = 24.470(2) Angstrom, V = 2565(1) Angstrom(3), Z = 4, and R = 0.060. It appears that the central aluminum atom is surro unded by two tripodal ligands in an octahedral geometry, whereas the o ther three aluminum atoms act to bridge the two ligands. Compound 2 ha s a pentacoordinated aluminum center surrounded by two tripodal ligand s and one methyl group. The sulfur atoms on the tripodal ligand were n ot coordinated to the central aluminum atom.