Structures of four- and six-coordinate monomers of [N,N '-bis(5-chlorosalicylidene)-1,3-diaminopropane]nickel(II)

[N,N' -Bis(5-chlorosalicylidene) -1,3 -diaminopropane] nickel(II) [Ni(C17H1 4N2O2Cl2)] 1 and [N,N' -Bis(5-chlorosalicylidene)-1,3 -diaminopropane] nick el(II) dihydrate [Ni(C17H14N2O2Cl2).2(H2O)] 2 were synthesized, and their c rystal structures were determined. Compound 1 is monoclinic, space group C2 /c, a = 21.063(4), b = 8.151(1), c = 9.421(2) Angstrom, beta = 94.16(1)degr ees, V = 1613.2(5) Angstrom (3), Z = 4 and D-c = 1.680 g cm(-3). Compound 1 contains a crystallographic twofold axis, and the whole molecule is not pl anar. The two Schiff base moieties, which in themselves are planar, are twi sted with respect to one another. The least-squares planes through each hal f of the molecule are inclined at an angle of 29.1(1)degrees. The Ni atom i s in a square-planar environment. The Ni-N and Ni-O distances are 1.958(2) and 1.910(2) Angstrom, respectively. Compound 2 is orthorhombic, space grou p Pnma, with a = 7.892(1), b = 23.396(2), c = 9.992(1) Angstrom, V = 1846.3 (3) Angstrom (3), Z = 4 and D-c = 1.597 g cm(-3). Compound 2 has crystallog raphic mirror symmetry, and again, the whole molecule is not planar. The tw o planar Schiff base moieties inclined at an angle of 38.7(1)degrees. The N i atom is in a distorted octahedral geometry and coordinated by the donor a toms of the ligand in the horizontal plane, and the coordination sphere is completed by O atoms of two water molecules.