Metal-Radical Chains Based on Polychlorotriphenylmethyl Radicals: Synthesis, Structure, and Magnetic Properties
作者:Nans Roques、Neus Domingo、Daniel Maspoch、Klaus Wurst、Concepció Rovira、Javier Tejada、Daniel Ruiz-Molina、Jaume Veciana
DOI:10.1021/ic100037z
日期:2010.4.5
radicals are connecting two Cu(II) or Co(II) metal ions. Therefore, from a magnetic point of view, both structures describe a magnetic chain model based on the PTMDC-M(II) unit. In this manuscript, the magnetic exchange coupling constants between both metal ions and the bridging PTM radicals have been determined. In both cases, the temperature dependence of the magnetic susceptibility reveals antiferromagnetic
我们报告了由一类新的基于有机基团的配体,即多氯代三苯甲基(PTM)基团建立的两条新的金属自由基链的合成,晶体结构和磁性。两种新的一维配位聚合物的晶体结构,[Cu 2(PTMDC)2(py)5(EtOH)]·3EtOH(1)和[Co 2(PTMDC)2(DMF)2(H 2 O)6 ]·5DMF (2)(其中PTMDC是被两个羧基官能化的PTM自由基),显示相似的链状结构,其中每个PTMDC自由基都连接两个Cu(II)或Co(II)金属离子。因此,从磁性的角度来看,两种结构都描述了基于PTMDC-M(II)单元的磁链模型。在该手稿中,已经确定了金属离子与桥接PTM自由基之间的磁交换耦合常数。在这两种情况下,磁化率的温度依赖性都揭示了PTMDC自由基与Cu(II)(J / k B = -42 K)和Co(II)(J / k B = -14.6 K)之间的反铁磁交换耦合常数。基于交换哈密顿量H =