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- W2014195812 abstract "Abstract The synthesis and characterization of some monomeric transition-metal coordination compounds with the novel bidentate ligand 5-methyl-4-(ethyl- mercaptomethyl)imidazole (abbreviated memi) are described, viz. [M(memi)2(H2O)2](NO3)2 and M(memi)2(NCS)2 with M = Co, Ni, Cu. Single crystals of [Ni(memi)2(H2O)2](NO3)2 (A), [Cu(memi)2(H2O)2](NO3)2 (B) and Co(memi)2(NCS)2 (C) were used in structure determinations. The three compounds all crystallize in the monoclinic space group P21/n with Z = 2. The cell dimensions for compound A are a = 10.402(2), b = 13.589(4), c = 8.476(3) A, β = 108.35(2)°, V = 1137.21 A3 and Dx = 1.551 g cm−3. The cell dimensions of compound B are a = 10.451(3), b = 13.430(5), c = 8.757(4) A, β = 109.24(3)°, V = 1160.35 A3 and Dx = 1.53 g cm−3. The cell dimensions for compound C are a = 12.147(7), b = 9.096(4), c = 10.363(4) A, β = 102.14(4)°, V = 1119.27 A3, and Dx = 1.447 g cm−3. The structures were solved by heavy-atom techniques and refined by least-squares methods to residual Rw values of 0.032 (A), 0.033 (B) and 0.046 (C). The coordination geometry of the metal ion in all compounds is distorted octahedral. In compounds A and B the metal ion is lying on a centre of symmetry and is surrounded by two thioether sulfur atoms, two imidazole nitrogen atoms and two oxygen atoms from water molecules. In contrast to the nickel ion in structure A the copper ion in compound B has a significantly elongated octahedral geometry in the direction of the oxygen molecules. The compound with the much stronger coordinating anion, NCS (compound C) resembles the structures of A and B in having the same coordination geometry with the thiocyanate anions coordinating instead of the water molecules." @default.
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- W2014195812 date "1989-12-01" @default.
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- W2014195812 title "Synthesis and spectroscopic studies on transition-metal nitrates and thiocyanates of a chelating imidazole-thioether ligand. The crystal structures of diaquabis[5-methyl-4-(ethyl-mercaptomethyl)imidazole]nickel(II) dinitrate, diaquabis[5-methyl-4-(ethyl-mercaptomethyl)imidazole] copper(II) dinitrate and bis[5-methyl-4-(ethyl-mercaptomethyl)imidazole] bis(thiocyanato-N)cobalt(II)" @default.
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- W2014195812 doi "https://doi.org/10.1016/s0020-1693(00)80822-1" @default.
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