Polytopal isomerism of the [Cd(S{O}CPh)3]- anion

The CdS3 skeleton of the anion in monoclinic (Ph4P)[Cd(S{O}CPh)(3)] has a near-planar structure, but among the three crystallographically different anions in the structure of rhombohedral (Ph4P)[Cd(S{O}CPh)(3)] there are both planar and uniquely pyramidal CdS3 skeletons. Thus, the [Cd(S{O}CPh)(3)](-) anion provides a new example of polytopal isomerism. [GRAPHICS] ents at room temperature. [GRAPHICS] clear organoaluminum compound {[AlMe2](3)[CH3C(CH2NH)(2)(CH2O)](2)Al} (1) and a trinuclear compound (AlMe2)(2)AlMe[CH3C(CH2NH)(CH2O)(CH2SPh)] (2), respectively. Both compounds were characterized by H-1 and C-13 NMR data, IR, and mass and elemental analysis. Compound 1 was also characterized by single-crystal X-ray diffraction analysis. Compound 1 crystallized in a tetragonal space group P4(1)2(1)2 (No. 92), with cell parameters a = 10.238(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 surrounded by two tripodal ligands in an octahedral geometry, whereas the other three aluminum atoms act to bridge the two ligands. Compound 2 has a pentacoordinated aluminum center surrounded by two tripodal ligands and one methyl group. The sulfur atoms on the tripodal ligand were not coordinated to the central aluminum atom.