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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >1D coordination polymer (OPD)(2)(CoSO4)-S-II showing SMM behaviour and multiple relaxation modes
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1D coordination polymer (OPD)(2)(CoSO4)-S-II showing SMM behaviour and multiple relaxation modes

机译：1D配位聚合物（OPD）（2）（COSO4）-S-II，显示SMM行为和多种弛豫模式

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摘要

A novel one-dimensional CoII coordination polymer (OPD)(2)(CoSO4)-S-II was formed from alternating tetrahedral sulphate anions, Co centers and molecules of 1,2-phenylenediamine (OPD). The thermal stability of the structure was confirmed up to similar to 230 degrees C using thermogravimetry and non-ambient powder X-ray diffraction in air. The distorted pseudo-octahedral coordination sphere of CoII ions promotes strong magnetic anisotropy. Therefore (OPD)(2)(CoSO4)-S-II was subjected to thorough characterization with ab initio and DFT calculations along with dc magnetic measurements both of which point to strong easy-axis anisotropy (D/k(B) approximate to -87 K, E/k(B) approximate to 23 K). The analysis of ac susceptibility revealed field assisted magnetic relaxation in two field regimes: a low field one with one relaxation time and a high field one where three relaxation times were distinguished. The main role in relaxations of the fastest process (tau(1)) was attributed to the direct and Raman processes.
机译：一种新的一维COII配位聚合物（OPD）（2）（COSO4）-S-II由交替的四面体硫酸根阴离子，CO中心和1,2-苯二胺（OPD）的分子形成。使用在空气中的热再生和非环境粉末X射线衍射确认结构的热稳定性高达230℃。 COII离子的扭曲的伪八面体配位球体促进了强磁各向异性。因此，与AB初始和DFT计算进行彻底表征（OPD）（2）（COSO4）-S-II以及DC磁测量，两者均指向强易轴各向异性（D / K（B）近似的直流磁测量值87 k，e / k（b）近似为23 k）。 AC易感性分析揭示了两个场地制度中的磁场辅助磁松弛：一个低磁场，一个弛豫时间和高场的高场，区分了三次放松时间。放松最快的过程中的主要作用（Tau（1））归因于直接和拉曼过程。

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