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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Spin crossover in iron(III) Schiff-base 1-D chain complexes
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Spin crossover in iron(III) Schiff-base 1-D chain complexes

机译:铁(III)Schiff碱一维链配合物的自旋交叉

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A series of iron(III) 1-D polymeric materials of the general formula [Fe(III)(Schiff-base)(L)]-(BPh4)(center dot)n(CH3OH) (Schiff base = N,N'-ethylenebis(salicylaldimine) (H(2)salen), N,N'-o-phenylenebis(salicylaldimine) (H(2)salophen) and N,N'-ethylenebis(acetylacetone)-2,2'-imine (H-2 acen); L = bridging di-pyridyl or di-imidazole ligand, n = 0-4) and analogues therein, have been synthesised and structurally and magnetically characterised. In this series, a range of structural motifs are observed including linear 1-D chains, hydrogen-bonded chains, a 'hybrid' 1-D chain-and -dimer compound and a hydrogen-bonded dinuclear material; all exhibit extensive intermolecular interactions. The magnetic consequences of varying both the equatorial Schiff-base ligands and axial bridging ligands have been investigated. Overall, we find that, independent of the axial bridging ligand employed, the salen equatorial ligand results in a high spin character and the acen ligand results in spin crossover character, generally with a spin transition of a gradual nature. Variations in magnetic behaviour can be rationalized, in part, in terms of the C2N2 backbone conformation of the equatorial Schiff base ligand, which may either inhibit or allow a spin transition.
机译:一系列通式为[Fe(III)(席夫碱)(L)]-(BPh4)(中心点)n(CH3OH)的铁(III)1-D聚合材料(席夫碱= N,N' -亚乙基双(水杨基醛亚胺)(H(2)salen),N,N'-邻亚苯基双(水杨基醛亚胺)(H(2)salophen)和N,N'-亚乙基二(乙酰丙酮)-2,2'-亚胺(H -2 acen); L =桥联二吡啶基或二咪唑配体,n = 0-4)及其类似物,已经合成并在结构和磁性上进行了表征。在这个系列中,观察到一系列结构基序,包括线性一维链,氢键链,“杂合”一维链和二聚体化合物以及氢键合双核材料。都表现出广泛的分子间相互作用。已经研究了改变赤道席夫碱配体和轴向桥联配体的磁性结果。总的来说,我们发现,与所使用的轴向桥连配体无关,salen赤道配体导致高自旋特性,而acen配体导致自旋交叉特性,通常具有渐进性质的自旋转变。磁行为的变化可以部分根据赤道席夫碱配体的C2N2骨架构象来加以合理化,它可以抑制或允许自旋跃迁。

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