Synthesis and Structural Characterization of Tin(II) and Zinc(II) Derivatives of Cyclic α-Hydroxyketones, Including the Structures of Sn(maltol)2, Sn(tropolone)2, Zn(tropolone)2, and Zn(hinokitiol)2

• Published in: Inorganic chemistry 2001-08, Vol.40 (17), p.4384-4388
• Main Authors: Barret, Marie C, Mahon, Mary F, Molloy, Kieran C, Steed, Jonathan W, Wright, Philip
• Format: Article
• Language: English
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/ic0100368

Zinc(II) and tin(II) derivatives of maltol (Hmalt), ethylmaltol (HEtmalt), tropolone (Htrop), hinokitiol (Hhino), and kojic acid (Hkoj) have been prepared and characterized, and the crystal structures of M(trop)2 (M = Zn, Sn), Zn(hino)2·EtOH, and Sn(malt)2 have been determined. The Zn(trop)2 is a polymeric structure in which tropolone has both a bridging and chelating role; zinc(hino)2 crystallizes as an ethanol adduct of which the structure is a dimeric fragment of the Zn(trop)2 polymer and in which each metal is “capped” by a molecule of alcohol. The tin complexes are notably air-stable despite adopting monomeric pseudo-trigonal-bipyramidal structures (SnO4E; E is a stereochemically active lone electron pair) in which the ligands only chelate a single metal center.