Molecular structures of (Bu-t)Ga((S2CNPr2)-Pr-n)(2) and ((PrO)-Pr-i)Ga(S2CNEt2)(2): An example of an unusual ligand pseudorotation

The molecular structures of (Bu-t)Ga((S2CNPr2)-Pr-n)(2) (1) and ((PrO)-Pr-i )Ga(S2CNEt2)(2) (2) have been determined. The variation in the geometries o bserved for bis-dithiocarbamate compounds of gallium, (X)Ga(S2CNMe2)(2) (X = Cl, (PrO)-Pr-i, Bu-t) do not lie along the Berry pseudorotation pathway f or the square-based pyramid to trigonal bipyramid geometrical transition. I nstead, the structures appear to lie on an unusual ligand two-step, "Texas, " pseudorotation mechanism which results in a highly distorted trigonal bip yramidal geometry. Crystal data: (1) monoclinic, P2(1)/c, a = 9.786(1), b = 29.218(3), c = 9.452(1) Angstrom, beta = 108.379(9)degrees, V = 2564.7(5) Angstrom(3), and Z = 4. (2) Monoclinic, P2(1)/c, a = 10.980(3), b = 15.673( 4), c = 12.461(3) Angstrom, beta = 97.47(2)degrees, V = 2126.2(9) Angstrom( 3), and Z = 4.