Template self-assembly of cyano-bridged supramolecular complexes {[Cu(en)₂][KM(CN)₆]}_n(M = Cr^III, Fe^III, Co^III)

Abstract

2004) Template self-assembly of cyano-bridged supramolecular complexes {[Cu(en) 2 ][KM(CN) 6 ]} n (M = Cr III , Fe III , Co Reaction of K 3 [M(CN) 6 ] (M ¼ Cr III , Fe III , Co III ) with [Cu(en) 2 ](ClO 4 ) 2 in water gives three cyanide-bridged supramolecular complexes, {[Cu(en) 2 ][KM(CN) 6 ]} n [M ¼ Cr III (1), Fe III (2), Co III (3); en ¼ ethylenediamine], which have been characterized by elemental analysis, ICP analysis, IR spectra, TGA-DTA analysis and X-ray diffraction. Complex 1 crystallizes in the monoclinic, space group C2/c with cell dimensions a ¼ 0.85237(12), b ¼ 1.7014(3), c ¼ 1.2103(2) nm, ¼ 98.70(2) and Z ¼ 4, and 2 crystallizes in the same space group with a ¼ 0.8401(2), b ¼ 1.6844(5) Å , c ¼ 1.1859(2) nm, ¼ 98.98(2) and Z ¼ 4. The crystal structures of 1 and 2 reveal a novel three-dimensional porous framework in which [Cu(en) 2 ] 2þ acts as a template, [M(CN) 6 ] 3À as a building block and K þ as a connecting unit.