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Anamika Das Christoph Marschner Joan Cano Judith Baumgartner Joan Ribas M. Salah El Fallah Samiran Mitra 《Polyhedron》2009
Two new dicyanamido-bridged di- and polynuclear complexes of Co(II), [Co(dca)(tptz)(H2O)]2·2(ClO4) (1) and [Co(dca)2(imz)2]n (2) [dca, dicyanamide; tptz, 2,4,6-tris(2-pyridyl)1,3,5-triazine; and imz, imidazole] have been synthesized and characterized structurally, as well as magnetically. The X-ray single crystal structure determination of complex 1 shows that two symmetry related octahedral Co(II) ions are separated by dca ligand and other coordination sites are satisfied by tptz and aquo ligands. Each dinuclear unit is associated with each other by intramolecular hydrogen bonding interactions, giving rise to a 1D chain structure. On the other hand complex 2 is a 1D coordination polymer having [Co(II)(imz)2] units connected by double bridging dca ligands. These 1D chains interact through face-to-face π–π stacking interactions of the imz rings extending the dimensionality to a 2D supramolecular network. The variable temperature (300–2 K) magnetic measurements of both compounds reveal that dicyanamide exhibits a weak antiferromagnetic interaction between the metal centers. 相似文献
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Bin Ding Jian Li En‐Cui Yang Xiu‐Guang Wang Xiao‐Jun Zhao Prof. Dr. 《无机化学与普通化学杂志》2007,633(7):1062-1065
By the self‐assembly of 2‐aminobenzimidazole ( L ), Nadca (Nadca = dicyanamide sodium) and CdCl2, a novel one‐dimensional (1D) CdII coordination polymer [Cd(μ1,5‐dca)(μ1,3,5‐dca) L ]n ( 1 ) ( L = 2‐aminobenzimidazole) has been synthesized and structurally characterized by single crystal X‐ray diffraction, element analysis and FT‐IR spectra. In 1 μ1,5‐bidentate and μ1,3,5‐tridentate dca ligands bridge CdII ions to form a 1D tube‐like structure, which presents a new 1D tubular structural motif of (3.4(2))(3(2).4(2).5(3)) topology in M‐dca systems (M = metallic). Solid‐state blue fluorescence spectrum of 1 also has been determined and compared with that of free ligand. 相似文献
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