Crystal Structure of a Trigonally Compressed Hexakis-DMF Zinc(II) Complex

The zinc(II) complex [Zn(DMF)(6)](BPh4)(2) [hexakis(N,N-dimethylformamide-kappa O)zinc(II) bis(tetraphenylborate)] was prepared, and characterized by a single-crystal X-ray method. The compound crystallizes in the orthorhombic space group Pca2(1) and Z = 4 with cell parameters a = 30.231(5)angstrom, b = 9.2503(14)angstrom, c = 22.083(3)angstrom, V = 6175.2(16)angstrom(3). The R-1 [I > 2 sigma(I)] and wR(2) (all data) values are 0.0365 and 0.0744, respectively, for all 14167 independent reflections. Six N,N-dimethylformamide (DMF) molecules coordinate to a zinc(II) ion to form a complex cation, [Zn(DMF)(6)](2+), approximately belonging to an S-6 symmetry. The coordination geometry is trigonally compressed along the pseudo-S-6 axis. Among the six coordination bonds, one of them is 1.5% (0.031 angstrom) longer than the average (2.093 angstrom); another is 2.1% (0.044 angstrom) shorter than the average.