Low-temperature (100 K) crystal structures of pentaaqua(5-nitrosalicylato) complexes of magnesium(II), zinc(II), cobalt(II) and nickel(II): A π–π stacked and hydrogen bonded 3D supramolecular architecture

• Published in: Polyhedron 2006-07, Vol.25 (11), p.2229-2235
• Main Authors: Morgant, Georges, Bouhmaida, Nouzha, Balde, Lamine, Ghermani, Nour Eddine, d’Angelo, Jean
• Format: Article
• Language: English
• Subjects: 5-Nitrosalicylic acid ligand; Chemical Sciences; Cristallography; Crystal structure; Hydrogen bonded 3D supramolecular architecture; Mg(II), Zn(II), Co(II) and Ni(II) complexes; π–π Stacking
• ISSN: 0277-5387; 0277-5387
• DOI: 10.1016/j.poly.2006.01.018

Reactions of metal chloride or sulfate and the sodium salt of 5-nitrosalicylic acid (5-nsa) in aqueous solution result in isomorphous complexes of type [M(H 2O) 5(5-nsa)] + (5-nsa) − · H 2O [M = Mg ( 1), Zn ( 2), Co ( 3), Ni ( 4)] in the solid state. The metal-bonded cationic moiety and the non-ligating anionic one are engaged in π-stacking interactions. The anchoring of the individual ionic subunits through π–π stacking and extensive hydrogen bonding results in a 3D supramolecular architecture. Reactions of metal chloride or sulfate and the sodium salt of 5-nitrosalicylic acid (5-nsa) in aqueous solution result in isomorphous complexes of type [M(H 2O) 5(5-nsa)] + (5-nsa) − · H 2O [M = Mg ( 1), Zn ( 2), Co ( 3), Ni ( 4)] in the solid state. Structural analyses of these compounds reveal that the cationic moiety is a monomeric complex in which the metal is coordinated by five aqua ligands and one carboxylato O-atom from the 5-nitrosalicylato ligand, forming a slightly distorted octahedron. The crystal packing exhibits ionic parts assembled through extensive hydrogen bonding. The metal-bonded cationic moiety and the non-ligating anionic one are also engaged in π-stacking interactions which contribute to the crystal cohesion. The anchoring of the individual ionic subunits through π–π stacking and hydrogen bonding results in a 3D supramolecular architecture.