共查询到20条相似文献,搜索用时 15 毫秒
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Zheng‐Liang Lü Zhi‐Liang Liu De‐Qing Zhang 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(3):m147-m150
In the two isomorphous title compounds, viz. tris[2,2′‐bi(4,5‐dihydro‐1,3‐oxazole)‐κ2N,N′]copper(II) diperchlorate, [Cu(C6H8N2O2)3](ClO4)2, (I), and tris[2,2′‐bi(4,5‐dihydro‐1,3‐oxazole)‐κ2N,N′]nickel(II) diperchlorate, [Ni(C6H8N2O2)3](ClO4)2, (II), the MII ions each have a distorted octahedral coordination geometry formed via six N atoms from three 2,2′‐bioxazoline ligands. For each ligand, the two five‐membered rings are nearly coplanar. It is noteworthy that the Jahn–Teller effect is stronger in (I) than in (II). The three‐dimensional supramolecular structures of (I) and (II) are formed via weak hydrogen‐bonding interactions between O atoms from perchlorate anions and H atoms from 2,2′‐bioxazoline ligands. 相似文献
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John A. Schlueter Urs Geiser Jamie L. Manson 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(1):m1-m3
The crystal structure of [Mn(C4H2N3O)2(H2O)4]·2H2O, conventionally abbreviated [Mn(cdm)2(H2O)4]·2H2O, where cdm is carbamoyldicyanomethanide, is described. The bond lengths and distances are comparable to those previously reported for the isomorphous Ni and Co analogs. Molecular units are formed by coordination of the nitrile N atoms of two cdm anions and four water molecules to the manganese(II) cation. Although these mononuclear molecular species are connected via hydrogen bonding, no magnetic ordering was observed down to 1.55 K. 相似文献
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Cheng‐Bing Ma Chang‐Neng Chen Qiu‐Tian Liu 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(12):m618-m621
In the title compound, [Mn(C8H7O2)2(C12H9N3)], the manganese(II) centre is surrounded by three bidentate chelating ligands, namely, one 2‐(2‐pyridyl)benzimidazole ligand [Mn—N = 2.1954 (13) and 2.2595 (14) Å] and two p‐toluate ligands [Mn—O = 2.1559 (13)–2.2748 (14) Å]. It displays a severely distorted octahedral geometry, with cis angles ranging from 58.87 (4) to 106.49 (5)°. Intermolecular C—H...O hydrogen bonds between the p‐toluate ligands link the molecules into infinite chains, and every two neighbouring chains are further coupled by N—H...O and C—H...O hydrogen bonds between the 2‐(2‐pyridyl)benzimidazole and p‐toluate ligands, leading to an infinite ribbon‐like double‐chain packing mode. The complete solid‐state structure can be described as a three‐dimensional supramolecular framework, stabilized by these intermolecular hydrogen‐bonding interactions and possible C—H...π interactions, as well as stacking interactions involving the 2‐(2‐pyridyl)benzimidazole ligands. 相似文献
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Lei Zhang Miao Du Liang‐Fu Tang Xue‐Bing Leng Zhi‐Hong Wang 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):1210-1212
The crystal structure of the title complex, [Cu(C7H8N4)2(H2O)2](ClO4)2, consists of a discrete centrosymmetric [Cu(C7H8N4)2(H2O)2]2+ cation and two perchlorate anions. The CuII centre is six‐coordinated by four N donors from the two pyrazole rings [Cu—N 1.998 (2) and 2.032 (3) Å] and two O atoms from the water molecules occupying the apical sites [Cu—O 2.459 (3) Å]. The coordination geometry of the complex can be described as octahedral. There is a unique three‐dimensional network in which the perchlorate units are linked by a combination of strong O—H?O and weak C—H?O hydrogen bonds. 相似文献