Abstract
Two cyano-bridged heteronuclear coordination polymers [{Cu(bipn)} 3Fe(CN) 6] n (ClO 4) 2 n ·4 nH 2O (bipn=bis(3-aminopropyl)amine) ( 1) and [{Cd(tet)} 2Fe(CN) 6] n ·3 nH 2O (tet=triethylenetetramine) ( 2) were synthesized and their structures determined. Both complexes were obtained from the assembly reactions of [ML n ] 2+ (M=Cu, Cd; n=1, 2) and [Fe(CN) 6] 4− in aqueous solutions. Complex 1 exhibits a honeycomb structure with twisty rings formed by Cu(II), Fe(II), and cyanides. The anions ClO 4 − weakly coordinate to Cu(II) and form hydrogen bonds with amino groups of bipn, while water molecules link to the 2D network via hydrogen bonds. In complex 2, the neutral polymer [{Cd(tet)} 2Fe(CN) 6] n forms zigzag chains. The water molecules insert between chains and pull them together to form a layered structure via a series of interchain hydrogen bonds. Thermal analyses over the temperature range 30–700°C show both complexes decompose completely above 460°C.
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