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首页> 外文期刊>Inorganica Chimica Acta >Synthesis, structure and supramolecular features of cobalt(III) and cobalt(II) complexes, [CoH_xL](ClO_4)_y (x = y = 3, 2, 1.50, 1.45, 1 and 0 and x = 3, y = 2) of a triprotic imidazole containing Schiff base ligand. Effect of protonation state on supramolecular structure
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Synthesis, structure and supramolecular features of cobalt(III) and cobalt(II) complexes, [CoH_xL](ClO_4)_y (x = y = 3, 2, 1.50, 1.45, 1 and 0 and x = 3, y = 2) of a triprotic imidazole containing Schiff base ligand. Effect of protonation state on supramolecular structure

机译:钴(III)和钴(II)配合物[CoH_xL](ClO_4)_y(x = y = 3、2、1.50、1.45、1和0以及x = 3,y = 2)的合成,结构和超分子特征含席夫碱配体的三咪唑。质子化状态对超分子结构的影响

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摘要

Aerial reaction of cobalt(II) perchlorate with H_3(1) {H_3(1) is the tripodal ligand derived from the condensation of tris(2-aminoethyl)amine with three equivalents of 4-methyl-5-imidazolecarboxaldehyde} in acidic methanol results in isolation of both the orange [CoH_3(1)](ClO_4)_2 (trace) and red [CoH_3(1)](ClO_4)_3(2 pseudopolymorphs). An analogous reaction in methanol gives [CoH_2(1)](ClO_4)_2. Reaction of [CoH_2(1)](ClO_4)_2 (generated in situ) with aqueous sodium hydroxide gives [CoH(1)](ClO_4) (two pseudopolymorphs) and a trace amount of [CoH_(1.45)(1)](ClO_4)_(1.45). Reaction of [CoH_3(1)](ClO_4)_3 with 1.5 equivalents of hydroxide gives [CoH_(1.5)(1)](ClO_4)_(1.5). Reaction of [CoH(1)](ClO_4) with methanolic potassium hydroxide in acetonitrile gave [Co(1)] (two pseudopolymorphs). Complexes were characterized by EA and IR if available in sufficient amounts. All ten complexes were structurally characterized and their metrical parameters are consistent with a high spin cobalt(II) for [CoH_3(1)](ClO_4)_2 and low spin cobalt(III) for all of the cobalt(III) complexes. [CoH_3(1)](ClO_4)_2 and one polymorph of [CoH_3(1)](ClO_4)_3 dimerize by hydrogen bonding through three perchlorate anions. [CoH_2(1)](ClO_4)_2 and one of the pseudopolymorphs of [CoH(1)](ClO_4) form intermolecular imidazole-H. . .imidazolate hydrogen bonds resulting in hetero and homochiral 1D zig-zag chains, respectively. [CoH_(1.5)(1)](ClO_4)_(1.5) forms a tetrahedral array of octahedral cobalt complexes held together by intermolecular imidazole-H. . .imidazolate hydrogen bonds. [CoH_(1.45)(1)](ClO_4)_(1.45) forms a hexameric structure with a large central channel containing solvent and perchlorate anions. [CoH(1)](ClO_4) and both polymorphs of [Co(1)] form no intermolecular imidazole-H. . .imidazolate hydrogen bonds but do exhibit extensive hydrogen bond formation with water.
机译:高氯酸钴(II)与H_3(1){H_3(1)是三(2-氨基乙基)胺与三当量的4-甲基-5-咪唑甲醛的缩合反应生成的三脚架配体}在酸性甲醇中的空中反应同时隔离了橙色[CoH_3(1)](ClO_4)_2(迹线)和红色[CoH_3(1)](ClO_4)_3(2个伪多晶型物)。在甲醇中的类似反应得到[CoH_2(1)](ClO_4)_2。 [CoH_2(1)](ClO_4)_2(原位生成)与氢氧化钠水溶液反应,得到[CoH(1)](ClO_4)(两种假多晶型物)和痕量的[CoH_(1.45)(1)]( ClO_4)_(1.45)。 [CoH_3(1)](ClO_4)_3与1.5当量的氢氧化物反应,得到[CoH_(1.5)(1)](ClO_4)_(1.5)。 [CoH(1)](ClO_4)与甲醇氢氧化钾在乙腈中的反应得到[Co(1)](两种假多晶型物)。如果有足够的量,则通过EA和IR表征复合物。对所有十种配合物进行了结构表征,其度量参数与[CoH_3(1)](ClO_4)_2的高自旋钴(II)和所有钴(III)配合物的低自旋钴(III)一致。 [CoH_3(1)](ClO_4)_2和一种[CoH_3(1)](ClO_4)_3的多晶型物通过三个高氯酸根阴离子的氢键键合而二聚。 [CoH_2(1)](ClO_4)_2和[CoH(1)](ClO_4)的假多晶型之一形成分子间咪唑-H。 。咪唑基氢键分别形成杂手性和手性一维之字形链。 [CoH_(1.5)(1)](ClO_4)_(1.5)形成由分子间咪唑-H结合在一起的八面体钴配合物的四面体阵列。 。咪唑基氢键。 [CoH_(1.45)(1)](ClO_4)_(1.45)形成具有大中央通道的六聚体结构,该通道包含溶剂和高氯酸根阴离子。 [CoH(1)](ClO_4)和[Co(1)]的两个多晶型物不形成分子间咪唑-H。 。咪唑基氢键,但确实与水形成广泛的氢键。

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