Abstract
Abstract The crystal structures of trans-[CoCl2(dmpe)2]ClO4 (dmpe = 1,2-bis(dimethylphosphino)ethane) (1), trans(Cl,Cl)cis(P,P)-[CoCl2(edmp)2]PF6·0.5CH3OH (edmp = (2-aminoethyl)dimethylphosphine) (2) and trans-[CoCl2(en)2]NO3 (en = 1,2-ethanediamine) (3) were determined by the single-crystal X-ray diffraction method. Crystal data and final R values are: for 1, orthorhombic, Ccca, a = 15.192(3), b = 16.221(4), c = 18.129(3) Å, V = 4468(1) Å3, Dx = 1.58, Dm = 1.60 g cm−3, and Z = 8, and R = 0.041 for 2360 reflections; for 2, orthorhombic, C2221, a = 15.295(4), b = 18.583(5), c = 14.680(4) Å, V = 4172(2) Å3, Dx = 1.59, Dm = 1.63 g cm−3, and Z = 8, and R = 0.099 for 4626 reflections; for 3, monoclinic, P21/n, a = 6.348(1), b = 9.304(1), c = 9.853(1) Å, β = 101.79(1)°, V = 569.6(1) Å3, Dx = 1.82, Dm = 1.85 g cm−3, and Z = 2, and R = 0.043 for 1024 reflections. The Co–P bond distances (av 2.196(3) Å) in 2 is shorter by 0.063 Å than that (av 2.259(1) Å) in 1, while the Co–N bond distance (av 2.039(7) Å) in 2 is longer by 0.079 Å than that (av 1.960(3) Å) in 3, indicating the trans influence of the phosphino group. The metal-ligand bond distances were compared with those of the corresponding trans-dichloro complexes of Fe(II), Fe(III), Cr(III), and Rh(III).
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