کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1339017 | 979688 | 2006 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis, crystal structures and magnetic properties of trinuclear oxo-centered homo- and mixed-valence manganese pivalate complexes with imidazole (Im) and 1-methylimidazole (1-MeIm): [Mn3IIIO(O2CCMe3)6(Im)3](Me3CCO2)·0.5Me3CCO2H and [Mn2IIIMnIIO(O2CCMe Synthesis, crystal structures and magnetic properties of trinuclear oxo-centered homo- and mixed-valence manganese pivalate complexes with imidazole (Im) and 1-methylimidazole (1-MeIm): [Mn3IIIO(O2CCMe3)6(Im)3](Me3CCO2)·0.5Me3CCO2H and [Mn2IIIMnIIO(O2CCMe](/preview/png/1339017.png)
Two new μ3-oxo-centered trinuclear manganese complexes, one of them a homo-valence [Mn3IIIO(O2CCMe3)6(Im)3](Me3CCO2)·0.5Me3CCO2H (1) pivalate complex and the other a mixed-valence [Mn2IIIMnIIO(O2CCMe3)6(1-MeIm)3] (2) pivalate complex (where Im = imidazole, 1-MeIm = 1-methylimidazole), have been synthesized and characterized by IR spectroscopy, thermogravimetric analysis, X-ray crystallography and magnetochemistry. Complexes 1 and 2 are μ3-oxo-trinuclear compounds with the three manganese atoms bridged by six pivalate groups. At each axial position there is an Im (1) or 1-MeIm (2) molecule. In both compounds, the manganese coordination geometry is slightly distorted octahedral, consisting of the oxygen of the central triangle, four oxygen atoms from bridging pivalate ligands, and a terminal Im or 1-MeIm nitrogen atom. The crystal packing of 1 involves hydrogen bonding between complex cations [Mn3O(Piv)6(Im)3]+ and outersphere pivalate ions, whereas in compound 2 interactions of the C–H⋯π type, formed by both the aromatic and methyl C–H groups of 1-MeIm molecules, are present. Magnetic studies reveal that both compounds represent antiferromagnetically coupled, spin-frustrated triangular systems exhibiting weak to moderate exchange coupling constants.
Two new μ3-oxo-centered trinuclear manganese complexes, one of them a homo-valence [Mn3IIIO(O2CCMe3)6(Im)3](Me3CCO2)·0.5Me3CCO2H (1) pivalate complex and the other a mixed-valence [Mn2IIIMnIIO(O2CCMe3)6(1-MeIm)3] (2) pivalate complex (where Im = imidazole, 1-MeIm = 1-methylimidazole), have been synthesized and characterized by IR spectroscopy, thermogravimetric analysis, X-ray crystallography. Magnetic studies reveal that both compounds represent antiferromagnetically coupled, spin-frustrated triangular systems exhibiting weak to moderate exchange coupling constants.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 25, Issue 18, 25 December 2006, Pages 3617–3627