文摘
An investigation into the anion dependence of the network-forming ability of metal complexes of hexamethylenebis(acetamide), CH3CONH(CH2)6NHCOCH3 (HMBA), has resulted in the X-ray characterization of the compounds[Co(HMBA)3][Co(NCS)4], 1, [Nd(HMBA)3][Nd(NO3)6]·2CHCl3, 2, [Co(HMBA)3][HgCl4], 3, and [Mn(HMBA)3][HgBr4]·3CHCl3, 4. The structures of compounds 1, 3, and 4 each comprise cationic frameworks formed by thebridging action of HMBA ligands binding octahedrally to the cobalt or manganese centers and, in the cases of 3and 4, the formation of tetrahedral HgX42- anions by transfer of the respective halide ions from Co or Mn to Hg.Complete anion (NO3-) transfer between Nd centers is also a key factor in the structure of 2, which forms acationic 3-D network of HMBA-bridged octahedrally coordinated Nd centers with occluded [Nd(NO3)6]3- anions.These types of inter-metal-anion transfer, with consequent complex counteranion formation, appear to facilitatethe network-forming ability of the metal-HMBA cationic arrays.