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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The O-P-O bridged Mn-2(salen)(2) chains showing coexistence of single chain magnet and metamagnet behaviour
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The O-P-O bridged Mn-2(salen)(2) chains showing coexistence of single chain magnet and metamagnet behaviour

机译:O-P-O桥接的Mn-2(salen)(2)链显示单链磁体和超磁体行为的共存

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摘要

Three new chain compounds in which the Mn-2(salen)(2) dimers are bridged by O-P-O units are reported, namely, [Mn-2(salen)(2)(C6H9PO3H)](ClO4) (1), [Mn-2(salen)(2)(C6H5PO3H)](ClO4) (2) and [Mn-2(salen)(2)(C6H5PHO2)](ClO4) (3). The phosphonate or phosphinate ligands adopt a syn-anti bidentate bridging mode in 1, while a syn-syn bidentate bridging mode in 2 and 3, thus leading to a difference in the Mn-O center dot center dot center dot O-Mn torsion angle over the O-P-O bridge. Compound 1 shows a paramagnetic behavior with dominant antiferromagnetic interactions. In compounds 2 and 3, the antiferromagnetic interactions through the O-PO bridges are considerably stronger than those in 1. They display coexistence of single chain magnet (SCM) behaviour with a spin canted structure and metamagnetism at low temperature. The results demonstrate that the magnetic dynamics of the O-P-O bridged Mn-2(salen)(2) chains may be modulated by selecting suitable phosphonate or phosphinate ligands.
机译:报道了三个新的链化合物,其中Mn-2(salen)(2)二聚体被OPO单元桥接,即[Mn-2(salen)(2)(C6H9PO3H)](ClO4)(1),[Mn -2(salen)(2)(C6H5PO3H)](ClO4)(2)和[Mn-2(salen)(2)(C6H5PHO2)](ClO4)(3)。膦酸酯或次膦酸酯配体在1中采用顺-反双齿桥接方式,而在2和3中采用顺-双齿桥接方式,因此导致Mn-O中心点中心点中心点中心点O-Mn扭转角的差异在OPO桥上。化合物1显示具有主要反铁磁相互作用的顺磁行为。在化合物2和3中,通过O-PO桥的反铁磁相互作用比在化合物1中的强得多。它们在低温下显示出具有自旋倾斜结构和超磁性的单链磁体(SCM)行为共存。结果表明,通过选择合适的膦酸酯或次膦酸酯配体可以调节O-P-O桥接的Mn-2(salen)(2)链的磁动力学。

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