Cu(II), Ni(II) and Fe(III) complexes with 2′,2
-(2,6-pyridindiyldiethylidene)-dioxamohydrazide in a monoanionic form. The crystal structure o
-(2,6-pyridindiyldiethylidene)-dioxamohydrazide in a monoanionic form. The crystal structure o
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- 作者：Ivanovic-Burmazovic ; Ivana ; Bacchi ; Alessia ; Pelizzi ; Giancarlo ; Leovac ; Vukadin M.
- 关键词： Copper(II) ; nickel(II) and iron(III) complexes ; 2 ; 6-diacetylpyridine derivative ; IR-spectra ; Crystal structure
- 刊名：Polyhedron
- 出版年：1998
- 出版时间：December 4, 1998
- 年：1998
- 卷：18
- 期：1-2
- 页码：119-127
- 全文大小：404 K
文摘
Starting from Cu(II) and Ni(II) perchlorate and Fe(III) chloride in the presence of 2,6-diacetylpyridine (dap) and semioxamazide (sox), the [Cu(Hdapsox)H2O]ClO4 (I), [Ni(Hdapsox)(MeOH)2]ClO4 (II) and [Fe(Hdapsox)Cl2] · 12– H2O (III) complexes with a singly deprotonated ligand Hdapsox− of the acyl hydrazone class (with H2dapsox=2′,2-(2,6-pyridindiyldiethylidene)dioxamohydrazide) have been obtained and characterized for the first time by a template synthesis. The previously assumed square-pyramidal structure of the Cu(II) complex with an asymmetrical coordination of Hdapsox− has been confirmed by a single-crystal X-ray analysis. In II Hdapsox− is octahedrally coordinated around a Ni(II) ion, while III is found to be a pentagonal-bipyramidal complex with a symmetrically bonded Hdapsox−. Causes of a ligand deprotonation occurring in a very acid medium (pH=0) and of a different coordination pattern in the case of Cu(II), Ni(II) and Fe(III) are interpreted by a dn configuration and an effective nuclear charge of the central metal ion (crystal field effects).
-(2,6-pyridindiyldiethylidene)dioxamohydrazide) have been obtained and characterized for the first time by a template synthesis. The previously assumed square-pyramidal structure of the Cu(II) complex with an asymmetrical coordination of Hdapsox− has been confirmed by a single-crystal X-ray analysis. In II Hdapsox− is octahedrally coordinated around a Ni(II) ion, while III is found to be a pentagonal-bipyramidal complex with a symmetrically bonded Hdapsox−. Causes of a ligand deprotonation occurring in a very acid medium (pH=0) and of a different coordination pattern in the case of Cu(II), Ni(II) and Fe(III) are interpreted by a dn configuration and an effective nuclear charge of the central metal ion (crystal field effects).