PENTACOORDINATED MOLECULES .43. MOLECULAR-STRUCTURE OF FLUORO DERIVATIVES OF ANIONIC PENTACOORDINATED GERMANIUM - A NEW GEOMETRICAL FORM FOR GERMANIUM (REPRINTED FROM INORG CHEM, VOL 21, PG 281, 1982)

The X-ray structures of tetraethylammonium bis(1,2-benzenediolato)fluo rogermanate, [(C2H5)(4)N](+)[(C6H4O2)(2)GeF](-) (3), and the related m onosolvate of methyltriphenylphosphonium bis(4-methyl-1,2-benzenedithi olato) fluorogermanate, [(CH3)PPh(3)](+)[(C7H6S2)(2)GeF](-). CH3CN (4) , lie along the Berry C-2v coordinate connecting the idealized trigona l bipyramid with the rectangular pyramid. The structure of 3 is placed about 81% along this coordinate toward the rectangular pyramid and th at for 4 is about 40% along this coordinate. 3 crystallizes in the mon oclinic space group P2(1)/c with a = 12.886 (2) Angstrom, b = 14.870 ( 2) Angstrom, c = 10.912 (1) Angstrom, beta = 100.29 (1)degrees and Z = 4. 4 crystallizes in the monoclinic space group P2(1)/n with a = 17.1 08 (6) Angstrom, b = 10.566 (3) Angstrom, c = 20.630 (6) Angstrom, bet a = 114.01 (2)degrees, and Z = 4, The final conventional unweighted re siduals were 0.035 and 0.058 for 3 and 4, respectively. The greater di splacement of the pentacoordinated oxa compound 3 toward the RP is rat ionalized in terms of reduced electron-pair-repulsion effects.