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The dominance of sulfate over two organic ligands in the solvothermal assembly of an undecanuclear cobaltous cluster: crystallography and mass spectrometry
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-11-12 , DOI: 10.1039/d0dt02880k
Li-Ping Jiang 1, 2, 3, 4, 5 , Mohamedally Kurmoo 6, 7, 8, 9, 10 , Ming-Hua Zeng 1, 2, 3, 4, 5
Affiliation  

An unexpected dominance of the coordination affinity of the sulfate anion over those of two organic chelating ligands, (1-methyl-1H-benzo[d]imidazol-2-yl)methanol (Hmbm) and pyridin-2-ylmethanamine (pma), was observed during the study of the solvothermal assembly of [Co11(mbm)6(pma)2(SO4)8(H2O)6(CH3OH)6]·5CH3OH (1), from CoSO4·7H2O at 100 °C in methanol. ESI-MS of solutions at different periods of the assembly reveal a hierarchical sequence, [Co1] → [Co2] → [Co3] → [Co4] → [Co5] → [Co9], where the lower nuclearity species are richer in Co2+ and SO42− before the inclusion of more mbm ligands at the last step. Its crystal structure consists of an almost symmetrical wheel of nine cobalt atoms, [Co9(mbm)6(SO4)8(H2O)6] in edge-sharing octahedral coordination arranged in triangles with two peripheral dangling [Co(pma)(CH3OH)3]. The sulfate ions exhibit three different coordination modes, two in μ6-, two in μ3- and four as μ2-bridging. Its thermal, optical and magnetic properties are also reported.

中文翻译:

十二碳素钴簇的溶剂热组装中硫酸盐在两个有机配体上的优势:晶体学和质谱

硫酸根阴离子的配位亲和力比两个有机螯合配体(1-甲基-1 H-苯并[ d ]咪唑-2-基)甲醇(Hmbm)和吡啶-2-基甲胺(pma)的配体亲和力出乎意料的优势在研究[Co 11(mbm)6(pma)2(SO 48(H 2 O)6(CH 3 OH)6 ]·5CH 3 OH(1)的溶剂热组装过程中观察到4 ·7H 2 O不连到100℃下在甲醇中。在组装的不同阶段,解决方案的ESI-MS揭示了一个层次序列,[Co1 ]→[Co 2 ]→[Co 3 ]→[Co 4 ]→[Co 5 ]→[Co 9 ],其中较低的核物种在包含更多的mbm之前富含Co 2+和SO 4 2-。配体的最后一步。它的晶体结构由9个钴原子的几乎对称的轮组成,[Co 9(mbm) 6(SO 4 8(H 2 O) 6 ]沿边沿共享的八面体配位,排列成三角形,两个外围悬垂[Co(pma )(CH 3 OH) 3]。硫酸根离子表现出三个不同的配位模式,两个μ 6 - ,两个μ 3 -和四个为μ 2 -bridging。还报告了其热,光学和磁性能。
更新日期:2020-11-25
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