Heptacoordination in MnII,NiII, and CuII complexes of 2,6-diacetylpyridine bis (acetylhydrazone) |
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| Authors: | Sandra Ianelli Corrado Pelizzi Giancarlo Pelizzi Pieralberto Tarasconi |
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| Affiliation: | (1) Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Universita di Parma and Centro di Studio per la Strutturistica Diffrattometrica del C.N.R., Viale delle Scienze, 43100 Parma, Italy |
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| Abstract: | Manganese(II), nickel(II), and copper(II) complexes of 2,6-diacetylpyridine bis (acetylhydrazone) (H2dapac) have been synthesized and structurally characterized by X-ray diffraction methods. [Mn(H2dapac) (OH2)2](NO3)2 crystallizes in the monoclinic space groupP21/c witha=11.145(3),b=10.723(4),c=17.189(2) Å,  =92.81(2)° andZ=4; [Ni(H2dapac)(OH2)2] (NO3)2·H2O crystallizes in the monoclinic space groupP21 witha=9.994(3),b=14.423(4),c=7.697(2)Å, =100.37(2)°, andZ=2; [Cu(H2dapac)(OH2)2](NO3)2·H2O crystallizes in the orthorhombic space groupPbcn witha=20.986(5),b=14.552(3),c=6.905(1)Å andZ=4. In each case the metal atom has a slightly distorted pentagonal bipyramidal environment, the equatorial positions being occupied by three nitrogen and two oxygen atoms from the hydrazone ligand and the apices by two water molecules. The crystalline cohesion in ensured by a three-dimensional network of hydrogen bonds involving the complex cations, the nitrate anions, and, where present, the uncoordinate water molecules. |
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| Keywords: | Metal hydrazone complexes manganese complex nickel complex copper complex x-ray structure heptaccordination |
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