The crystal structure of diaquabis(2,4-dinitrophenolato) cobalt(II) tetrahydrate

Sharma, R.P., Singh, P., Hefter, G. and Tieking, E.R.T. (1998) The crystal structure of diaquabis(2,4-dinitrophenolato) cobalt(II) tetrahydrate. Zeitschrift fur Kristallographie, 213 (4). pp. 249-252.

Abstract

The crystal and molecular structure of diaquabis(2,4-dinitrophenolato)cobalt(II) tetrahydrate, [Co(dnp)2 · (OH2)2] · 4 H2O, C12H18CoN4O16, has been determined at room temperature. The red-brown crystals are triclinic, space group P1̄ with unit cell dimensions a = 8.961(3) Å, b = 11.573(3) Å, c = 4.872(1) Å, α = 93.05(2)°, β = 90.72(2)°, γ = 90.16(2)°, Z = 1 and Dx = 1.755 Mg m-3. The structure was refined by a full-matrix least-squares procedure on F to final R = 0.037 using 1644 reflections with I ≥ 3.0σ(I). The cobalt(II) atom (which lies on a center of inversion) exists in a slightly distorted octahedral geometry with the basal plane being defined by two phenoxide (2.001(2) Å) and two nitro oxygen atoms (2.110(2) Å) and the axial positions by two oxygen donor atoms derived from two symmetry related H2O molecules (2.092(2) Å). The lattice is stabilised by a network of hydrogen-bonding contacts.