功能三联吡啶异金属六核配合物的合成与表征

Synthesis,crystal structure and characterization of a heterometallic hexanuclear complex based on functional terpyridine

目的研究新型多核异金属配合物的一步合成方法及配合物的结构特征。方法将FeCl_3,CdCl_2·2.5H_2O与4′-(3-吡啶基)-2,2′:6′,2″-三联吡啶在甲醇溶剂中自组装反应,并利用元素分析、红外光谱、X-射线单晶衍射结构分析等方法对所得化合物进行了表征。结果包含Fe~Ⅱ,Cd~Ⅱ双金属的六核配合物[Fe(3-pytpy)_2Cd_2Cl_6]_2·2CH_3OH(1)单晶被合成。结论 Fe~Ⅲ在反应过程中被还原为Fe~Ⅱ,每个Fe~Ⅱ与两个3-pytpy形成[Fe(3-pytpy)_2]^(2+)构建单元,该单元中的两个未配位的氮原子桥联五、六配位的Cd~Ⅱ形成Cd…Fe…Cd三核单元,三核单元再通过双氯桥联成二聚体。配合物通过弱氢键形成二维超分子结构。

Aim To investigate the one-pot synthesis of novel heterometallic structure and study the structural characteristic of the compound. Methods The compound was self-assembled by the reaction of FeCl3, CdCl2 · 2. 5H2O with 4＇- （ 3-pyridyl ） -2,2＇ ： 6＇, 2＂-terpyridine in CHs OH solution and characterized by elemental analysis, IR, and single crystal X-ray diffraction structure analysis. Results The single-crystals of the heteronuclear complex [ Fe（3-pytpy）2Cd2Cls ] 2 · 2CHsOH （1） containing Fen/Cdn atoms were obtained. Conclusion The crystal structure revealed that Fern is reduced into Fen and each of them is coordinated by two 3-pytpy ligands into [ Fe （ 3- pytpy）2 ]^2＋ building block, which further connects the four-and five-coordinated CdH atoms into Cd...Fe...Cd unit with two uncoordinated nitrogen atoms from the pendant pyridyl rings. Double chloride bridge connects the trinuclear units into dimeric sturcture. In the solid state, weak hydrogen bonds connected the discrete structure into 2D sheet.