%0 Journal Article
%T Synthesis, Crystal Structures, and Magnetic Properties of Ternary M(II)-Dicyanamide-hydroxypyridine Complexes
%A Ling-Ling Zheng
%J Journal of Inorganic Chemistry
%D 2013
%R 10.1155/2013/206589
%X Three two-dimensional (2D) and 3D supramolecular coordination architectures based on ternary M(II)-dicyanamide-2-hydroxypyridine systems, [Co(hmpH)2(dca)2] (1), [Cu(hmpH)2(dca)2] (2), and [Mn(hepH)2(dca)2] (3) (dca = dicyanamide, hmpH = 2-(hydroxymethyl)pyridine, hepH = 2-(hydroxyethyl)pyridine), have been synthesized. 1 is a mononuclear Co(II) complex. The mononuclear units are interlinked into a 2D (4,4) hydrogen-bonded layer via O每HˋN hydrogen bonds between the hydroxyl groups and the noncoordinating nitrile ends. These 2D layers are further extended into a 3D supramolecular architecture via the interlayer pyridyl-pyridyl stacking interaction. 2 has a 1D coordination chain structure formed by the double 1,5-dca bridged dinuclear [Cu2( 1,5-dca)2(hmpH)2] unit and the 1,3-dca bridges via weak Cu每N coordination, and these 1D coordination chains are further extended into 2D hydrogen-bonded layers via strong O每HˋN hydrogen-bonding interaction between the hydroxyl groups and the noncoordinating nitrile ends. 3 is a 2D (4,4) coordination network made of 1D [Mn(hepH)( 1,5-dca)] helical chain units and interchain double ( 1,5-dca) bridges. Pairs of [Mn(hepH)( 1,5-dca)] helical chains are interlinked by the double ( 1,5-dca) bridges into a racemic coordination layer structure, which is further extended into a 3D hydrogen-bonded network. Magnetic studies reveal that weak antiferromagnetic exchange occurs in 3. 1. Introduction Since the pioneering reports of Robson and coworkers in 1990 [1, 2], this realm of crystal engineering is growing interest, and great efforts have been devoted to the assembly of supramolecular systems of organic molecular solids and coordination polymers through hydrogen bonds and or coordination bonds, with the resultant crystalline materials having a wide range of potential applications, such as electronic, magnetic, optical, absorbent, and catalytic materials [3每29]. In recent years, much attention has been devoted to dicyanamide-anion- (dca-) bridged coordination polymers [30每42] for the large variety of magnetic properties, especially the 汐-M(dca)2 series of compounds, which have isomorphous rutile-like structure, display ferromagnetism (Co, Ni) [43每46], spin-canted antiferromagnetism (Cr, Mn, Fe) [47, 48], and paramagnetism (Cu) [45, 46]. Of further importance, from a structural perspective, when auxiliary L ligands are introduced to the ternary -dca-L systems, different coordination architectures, such as mononuclear and dinuclear compounds [49], 1D chains [50每58], 2D (4,4) or (6,3) [59每63] sheets, and 3D network topologies [64每67],
%U http://www.hindawi.com/journals/jic/2013/206589/