کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1340152 | 979722 | 2009 | 5 صفحه PDF | دانلود رایگان |
In this study the synthesis, crystal structure and characterization of three new transition metal polynuclear compounds with formula [Cu(dipm)(μ-dca)2]n(H2O) (1), [Ni(dipm)(μ-dca)2]n(C2H6O)1/2 (2) and [Cd(dipm)(μ-dca)2]n (3) (in which dipm = bis(pyrimidin-2-yl)amine and dca = dicyanamide) are reported. The isostructural compounds 1 and 2 contain a double-bridging end-to-end dca unit connecting two metal ions and a single bridging end-to-end dca unit between subsequent metals. Compound 3 exhibits only single bridging end-to-end dca units, oriented in three directions, giving rise to a 3D framework.The geometry around the Cu(II) (1) and the Ni(II) (2) centers is (distorted) octahedral and consists of two nitrogen atoms of a bis-chelating dipm ligand, two nitrogen atoms of two different dca anions both acting as end-to-end bridges between two M(II) ions and two nitrogen atoms of two different dca molecules which are end-to-end bridged to two different M(II) ions. The geometry around the Cd(II) ion (3) is octahedral and consists of 2 nitrogen atoms of a bis-chelating dipm ligand and four nitrogen atoms of four different dca anions which form end-to-end bridges to four different Cd(II) ions, thus producing a 3D network.
Three novel transition metal polynuclear compounds with formula [Cu(dipm)(μ-dca)2]n(H2O) (1), [Ni(dipm)(μ-dca)2]n(C2H6O)1/2 (2) and [Cd(dipm)(μ-dca)2]n (3) (in which dipm = bis(pyrimidin-2-yl)amine and dca = dicyanamide) are reported. Compounds 1 and 2 contain rare double-bridging end-to-end dca units, connecting two metal ions and a single bridging end-to-end dca unit between subsequent metals. Compound 3 exhibits single bridging end-to-end dca units oriented in three directions, resulting in a 3D framework.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 28, Issue 8, 10 June 2009, Pages 1541–1545