[NaCuII4] Cluster from Alkali Template Assembly of Two Asymmetric End-On Azido-Bridged [CuII2] Units

The cluster [NaCu4L2(N3)2](ClO4) [1; H3L is 2-(2‘-hydroxyphenyl)-1,3-bis[3‘-aza-4‘-(2‘ ‘-hydroxyphenyl)prop-4‘-en-1‘-yl]-1,3-imidazolidine] has been synthesized and structurally characterized.
Complex 1 is formed by the template assembly of two [Cu2L(N3)]
neutral fragments through their weak oxophilic interactions with a
central Na+ cation as observed in metallacrowns. The cluster
exhibits a combination of ferro- and antiferromagnetic interactions.
End-on N3- bridging of copper ions within the [CuII2] units facilitates
stabilization of S = 1 magnetic subunits that mutually cancel via
antiferromagnetic coupling as mediated by the O···Na+···O
bridges.

该簇合物[NaCu4L2(N3)2](ClO4) [1; H3L为2-(2'-羟基苯基)-1,3-双[3'-氮杂-4'-（2'-羟基苯基）丙-4'-烯-1'-基]-1,3-咪唑啉]已被合成并进行了结构表征。复合物1通过两个[Cu2L(N3)]中性片段的模板组装形成，这些片段通过与中心Na+阳离子发生的弱亲氧相互作用，正如在金属冠中观察到的，从而形成。该簇合物表现出铁磁性和反铁磁性相互作用的结合。在[CuII2]单元内，N3-桥连铜离子促进了S = 1磁性亚单元的稳定，这些亚单元通过O···Na+···O桥连的反铁磁性耦合相互抵消。