Unexpected behaviour of pyridine-2-carbaldehyde thiosemicarbazonatocopper(II) entities in aqueous basic medium -: Partial transformation of thioamide into nitrile
Unexpected behaviour of pyridine-2-carbaldehyde thiosemicarbazonatocopper(II) entities in aqueous basic medium -: Partial transformation of thioamide into nitrile
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DOI：
10.1002/ejic.200500326
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发表时间：
2005-09-05
影响因子：
2.3
通讯作者：
García-Tojal, J
中科院分区：
文献类型：
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作者：
Gómez-Saiz, P;Gil-García, R;García-Tojal, J
在碱性水溶液中，从HL/Cu-II/NO3-体系（HL =吡啶-2-醛硫代氨基脲）中得到了不寻常的物质。当Cu/HL摩尔比为1:1时，发生部分脱硫过程，析出混合配体[Cu(L)(L- cn)](1)配合物[HLCN = C7H6N4,（吡啶-2-基亚甲基）肼腈]。该化合物含有Cu-II离子，呈方-锥体结构。另一方面，扭曲的八面体[Cu(L)(2)](2)实体在硫代氨基脲配体之外被分离出来。即使在生理pH值下也能检测到硫代氨基脲的脱硫作用。然而，在没有Cu-II离子和HL(.)2.25H(2)O(3)或(HLH2O)- h -的情况下，该反应不会发生。是在这些条件下得到的。(c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)。
Unusual species are obtained from the HL/Cu-II/NO3- system (HL = pyridine-2-carbaldehyde thiosemicarbazone) in basic aqueous solutions. A partial desulfurization process occurs for 1:1 Cu/HL molar ratio which gives rise to the precipitation of the mixed ligand [Cu(L)(L-CN)] (1) complex [HLCN = C7H6N4, (pyridin-2-ylmethylene)hydrazinecarbonitrile]. This compound contains Cu-II ions in a square-pyramidal environment. On the other hand, distorted octahedral [Cu(L)(2)] (2) entities are isolated in excess of the thiosemicarbazone ligand. Desulfurization of the thiosemicarbazone is detected even at physiological pH values. However, this reaction does not take place in absence of Cu-II ions, and HL(.)2.25H(2)O (3) or (HLH2O)-H-. are obtained in these conditions. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005).