Syntheses and Crystal Structures of Two Nickel(Ⅱ) Complexes [Ni(dmpzm)_2(L)]Cl·nH_2O (L=HCO_2,OAc;n=

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Reactions of NiCl2·6H2O with dmpzm and formic or acetic acid at PH = 7 pro- duced the two title compounds, [Ni(dmpzm)2(HCO2)]Cl·2H2O 1 and [Ni(dmpzm)2(OAc)]Cl·3H2O 2 (dmpzm = 1,1’-methylenebis(3,5-dimethyl-1H-pyrazole)). 1 and 2 were characterized by elemental analysis, IR spectra, and thermogravimetric analysis. 1 crystallizes in the orthorhombic system, space group Pcca with a = 18.700(2), b = 8.6843(9), c = 18.098(2) , V = 2939.1(5) 3, Z = 4, Dc = 1.319 g/cm3, T = 193 K, C23H37ClN8NiO4, Mr = 583.75, F(000) = 1232, μ(MoKα) = 0.792 cm-1, S = 1.079, R = 0.0772 and wR = 0.1958 for 2265 observed reflections with I > 2σ(I). 2 crystallizes in the orthorhombic system, space group Pcca with a = 17.011(3), b = 18.630(4), c = 19.300(4) , V = 6117(2) 3, Z = 8, Dc = 1.337 g/cm3, T = 193(2) K, C24H41ClN8NiO5, Mr = 615.79, F(000) = 2608, μ(MoKα) = 0.768 cm-1, S = 1.059, R = 0.0518 and wR = 0.1109 for 5124 observed reflections with I > 2σ(I). The Ni atoms in 1 or 2 are chelated by two dmpzm ligands and one formate or acetate anion, forming slightly distorted octahedral geometries. In the crystals of 1 or 2, intermolecular hydrogen bonding interactions result in the formation of 2D hydrogen-bonded frameworks. Reactions of NiCl2 · 6H2O with dmpzm and formic or acetic acid at pH = 7 pro- duced the two title compounds, [Ni (dmpzm) 2 (HCO2)] Cl · 2H2O 1 and [Ni (dmpzm) 2 (OAc) 1 and 2 were characterized by elemental analysis, IR spectra, and thermogravimetric analysis. 1 crystallizes in the orthorhombic system, space group (dmpzm = 1,1’-methylenebis Pcca with a = 18.700 (2) b = 8.6843 (9) c = 18.098 (2)  V = 2939.1 (5) 3 Z = 4 Dc = 1.319 g / cm3 T = 193 K C23H37ClN8NiO4 , Mr = 583.75, F (000) = 1232, μ (MoKα) = 0.792 cm -1, S = 1.079, R = 0.0772 and wR = 0.1958 for 2265 observed reflections with I> 2σ (I). 2 crystallizes in the orthorhombic space group Pcca with a = 17.011 (3) b = 18.630 (4) c = 19.300 (4)  V = 6117 2 3 Z = 8 Dc = 1.337 g / cm3 T = (2) K, C24H41ClN8NiO5, Mr = 615.79, F (000) = 2608, μ (MoKα) = 0.768 cm-1, S = 1.059, R = 0.0518 and wR = 0.1109 for 5124 observed reflections with I> The Ni atoms in 1 or 2 are chelated by two dmpzm ligands and one formate or acetate anion, forming slightly distorted octahedral geometries. In the crystals of 1 or 2, intermolecular hydrogen bonding interactions result in the formation of 2D hydrogen-bonded frameworks.
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