کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1336660 | 1500265 | 2014 | 10 صفحه PDF | دانلود رایگان |
The work in this report deals with seven compounds of composition {[CuII(dmpn)2]3[FeIII(CN)6]2·6H2O}n (1), {[CuII(dmpn)2]3[CoIII(CN)6]2·6H2O}n (2), {[CuII(dmpn)2]3[CrIII(CN)6]2·4H2O}n (3), {[CuII(dmpn)][NiII(CN)4]·H2O}n (4), [{CuII(dmpn)2Cl}{CuII(dmpn)2(H2O)}][AgI(CN)2]Cl2 (5), [(CuII(dmpn)2(dicyanamide)2] (6) and [(NiII(dmpn)2(dicyanamide)2] (7), where dmpn = 2,2-dimethyl-1,3-diaminopropane. Syntheses, characterization and crystal structures of 1–7 along with variable-temperature (2–300 K) magnetic properties of 1 and 3 are described. Compounds 1–4 are cyanide-bridged two-dimensional coordination polymers. Twelve metal-membered ring is formed in 1–3, while both four and eight metal-membered rings are formed in 4. On the other hand, dicyanoargentate(I) in 5 is noncoordinated and dicyanamide in 6 and 7 behaves as monodentate terminal ligand. The coordination polymers in 1–4 and the discrete systems in 5–7 are self-assembled by hydrogen bonding interactions to generate overall three-dimensional supramolecular topologies. A novel structural aspect, two-dimensional network containing both four and eight metal-membered rings, has been observed in the copper(II)–tetracyanonickelate(II) compound 4. Magnetic studies reveal ferromagnetic interaction between CuII and CrIII in 3. In addition, spin–orbit coupling of low-spin FeIII or weak antiferromagnetic interaction along with intermolecular antiferromagnetic interactions which exist between CuII and FeIII are present in 1.
The work here deals with copper(II)–hexacyanoferrate(III)/hexacyanocobaltate(III)/hexacyanochromate(III)/tetracyanonickelate(II), cocrystalline copper(II) dicyanoargentate(I) and copper(II)/nickel(II)–dicyanamide compounds having a diamine as the blocking ligand. The systems are discrete or two-dimensional in terms of coordinate bonds and three-dimensional in terms of hydrogen bonds.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 74, 28 May 2014, Pages 57–66