First example of atmospheric carbon dioxide uptake by a cyanocomplex: Preparation and structural characterization of Zn-2(tn)(2)(CO3)Ni(CN)(4) center dot H2O(tn=1,3-diaminopropane)

摘要

The aqueous system Zn(II)-tn-[Ni(CN)(4)](2)- in contact with air captured carbon dioxide in the form of a carbonato ligand yielded the compound Zn-2(tn)(2)(CO3)Ni(CN)(4) center dot H2O by crystallization, which was characterized by elemental analyses, IR spectroscopy and single crystal structure analysis. Its crystal structure is polymeric and is built up of a positively charged framework [Zn-4(tn)(4)(CO3)(2)Ni(CN)(4)](n)(2n+), free tetracyanonickellate anions with a nickel atom on the inversion centre and water molecules of crystallization. Two crystallographically different zinc atoms exhibit tetrahedral and penta-coordinations. The zinc atoms are interconnected by two crystallographically independent bridging tn ligands, mu(3)-CO32- carbonato ligand and one centrosymmetric tetracyanonickellate anion acting as trans-[-NC-Ni(CN)(2)-CN-] ligand. The carbonato ligand coordinates three zinc atoms by an unusual mode, two by an unidentate and one by a bidentate fashion with one oxygen donor atom forming two Zn-O coordination bonds. (c) 2005 Elsevier Ltd. All rights reserved.