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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ancillary ligand assisted self-assembly of coordination architectures of Mn(II): the effect of the N-alkyl group on a tridentate ligand
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Ancillary ligand assisted self-assembly of coordination architectures of Mn(II): the effect of the N-alkyl group on a tridentate ligand

机译：辅助配体辅助Mn（II）配位结构的自组装：N-烷基对三齿配体的影响

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摘要

For a subtle change in the N-alkyl group of the tridentate ancillary ligand, bis(2-pyridylmethyl) alkylamine (where the alkyl group = methyl (bpma) or ethyl (bpea)), completely different products are formed under similar reaction (in methanol) as well as crystallization conditions (in water). One containing coordinated water molecules is the 3D supramolecular assembly of a tetrameric synthon comprised of the dimeric subunits, [Mn-2(adc)(2)(bpma)(2)(H2O)(2)] (1), organized by strong hydrogen bonding while the other without a coordinated water molecule forms the 1D coordination polymer, [Mn-2(adc)(2)(bpea)(2)](n) (2) (where adc = acetylene dicarboxylate), featuring a uninodal 4-connected SP 1-periodic net (3,6)(1,2) for 1D -> 2D with the point group {3(boolean AND)3.4(boolean AND)2.5}. Unlike 1, two chains of 1D CP in 2 have a moderate pi-pi interaction between two corresponding pyridine rings (the centroid-centroid distance: 3.659 angstrom) resulting in the formation of a ladder like supramolecular assembly. On the other hand, there is no effect in changing the dicarboxylate linker from adc to fumarate as the product [Mn-2(fumarate)(2)(bpea)(2)](n) (3) is found to be similar to 2. All these are also characterized by elemental analysis, powder X-ray diffraction (PXRD), FTIR and Raman spectroscopy. Their thermal stability was studied by thermogravimetric analysis. Based on variable temperature PXRD studies, compounds 1 and 2 retain their crystallinity and overall structure up to 100 degrees C and 175 degrees C, respectively. The water vapor adsorption study of 1 and 2 corroborates well with their solid state structures determined by single crystal X-ray diffraction, specifically their affinity towards water; furthermore, the study of 1 with or without pre-treatment conditions shows its structural integrity intact due to dehydration.
机译：对于三齿辅助配体的双（2-吡啶基甲基）烷基胺（其中烷基=甲基（bpma）或乙基（bpea））的N-烷基有细微变化，在相似的反应下形成完全不同的产物（在甲醇）以及结晶条件（在水中）。包含配位水分子的一个是四聚体合成子的3D超分子组装，其由二聚体亚基[Mn-2（adc）（2）（bpma）（2）（H2O）（2）]（1）组成，氢键，而另一个没有配位水分子的氢键形成一维配位聚合物[Mn-2（adc）（2）（bpea）（2）]（n）（2）（其中adc =乙炔二羧酸盐），具有单链1点-> 2D的4连接SP 1周期网（3,6）（1,2），其点组为{3（布尔AND）3.4（布尔AND）2.5}。与1不同，2中的1D CP的两条链在两个相应的吡啶环之间有适度的pi-pi相互作用（质心-质心距离：3.659埃），导致形成类似超分子组装的阶梯。另一方面，由于发现产物[Mn-2（富马酸酯）（2）（bpea）（2）]（n）（3）与2.所有这些还通过元素分析，粉末X射线衍射（PXRD），FTIR和拉曼光谱学进行表征。通过热重分析研究了它们的热稳定性。根据可变温度PXRD研究，化合物1和2分别保持其结晶度和最高至100摄氏度和175摄氏度的整体结构。 1和2的水蒸气吸附研究很好地证实了它们的固态结构是通过单晶X射线衍射确定的，特别是它们对水的亲和力。此外，对有或没有预处理条件的1的研究表明，由于脱水，其结构完整性是完整的。

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