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[Cu(X-salicylato)2(N,N-diethylnicotinamide)2(H2O)2] complexes: conformational polymorphism and its consequence in supramolecular hydrogen-bonding networks formation |
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| Authors: | Repická Zuzana Moncol Jan Puchoňová Miroslava Jorík Vladimír Mikloš Dušan Lis Tadeusz Padělková Zdenka Mazúr Milan Valigura Dušan |
| Institution: | 1.Department of Inorganic Chemistry, Slovak Technical University, Radlinského 9, 812 37, Bratislava, Slovakia ;2.Faculty of Chemistry, University of Wroc?aw, 50-383, Wroc?aw, Poland ;3.Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, nám. Cs. legií 565, 532 10, Pardubice, Czech Republic ;4.Department of Physical Chemistry, Slovak Technical University, Radlinského 9, 812 37, Bratislava, Slovakia ; |
| Abstract: | Novel copper(II) X-salicylate complexes with N,N-diethylnicotinamide (dena) of the formula Cu(RCOO)2(dena)2(H2O)2] (RCOO = 3-methylsalicylate anion (3-Mesal, 1), 4-methylsalicylate anion (4-Mesal, 2), 5-methylsalicylate anion (5-Mesal, 3), 5-methoxysalicylate anion (5-MeOsal, 4) or 4-methoxysalicylate anion (4-MeOsal, 5)), and complex Cu(3-MeOsal)2(dena)2(H2O)2]∙2H2O (3-MeOsal = 3-methoxysalicylate anion (6)) have been prepared in the crystalline forms and characterized by spectroscopic methods (IR, Vis–UV, EPR). All the compounds according to their composition (1–5) seem to possess octahedral copper(II) stereochemistry. The complex 1 has been prepared in two different forms. X-ray analyses of the complexes 1, 4, and 5 were carried out and they featured a tetragonal-bipyramidal geometry around the copper atoms. The tetragonal planes are created by X-salicylate anions bonded to the copper(II) atoms via unidentate carboxylate oxygen atoms and the pyridine ring nitrogen atoms of the neutral ligand N,N-diethylnicotinamide, while in axial positions are water molecules. The two forms of complex 1 present conformation polymorphs and supramolecular isomers. |
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