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Crystals 2016, 6(8), 91;

Metal(II) Complexes of Compartmental Polynuclear Schiff Bases Containing Phenolate and Alkoxy Groups

Institut für Physikalische und Theoretische Chemie, Technische Universität Graz, A-8010 Graz, Austria
Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9/V, A-8010 Graz, Austria
Department of Chemistry, Louisiana State University, Choppin Hall, Baton Rouge, LA 70803, USA
Department of Chemistry, University of Louisiana at Lafayette, P.O. Box 43700, Lafayette, LA 70504, USA
Authors to whom correspondence should be addressed.
Academic Editors: Thomas Doert and Mathias Wickleder
Received: 6 July 2016 / Revised: 31 July 2016 / Accepted: 3 August 2016 / Published: 9 August 2016
(This article belongs to the Special Issue Crystal Structure of Complex Compounds)
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Five mono-nuclear Cu(II) and Ni(II) complexes and one dinuclear Zn(II) complex were synthesized from the Schiff bases N,N'-bis(3-ethoxy-2-hydroxybenzylidene)-1,2-phenylenediamine (H2LOEt-phda) and 2-ethoxy-6-({2-[(3-ethoxy-2-hydroxybenzylidene)amino]-benzyl}iminomethyl)phenol (H2LOEt-ambza): [Cu(LOEt-phda)(H2O)].H2O (1), [Ni(LOEt-phda)].H2O (2), [Cu(LOEt-ambza)].H2O·EtOH (3), [Cu(LOEt-ambza)].H2O (4), [Ni(LOEt-ambza)] (5) and [Zn2(LOEt-ambza)(μ-OAc)(OAc)] (6). The complexes were structurally characterized with elemental microanalyses, IR, UV-Vis and ESI-MS spectroscopic techniques as well as single crystal X-ray crystallography. The metal centers display distorted square planar geometries in 24 and 5 and distorted square pyramidal (SP) in 1, whereas in 6 an intermediate geometry between SP and TBP was observed around the first Zn2+ ion and a tetrahedral around the second ion, with one acetate is acting as a bridging ligand. In all cases, metal ions were incorporated into the N2-O2 binding site with no involvement of the alkoxy groups in the coordination. The LOEt-ambza-complexes 36 revealed significant dihedral angles between the phenol rings and the plane containing the central benzene ring, and large O2-O2 bond distances (5.1-5.9 Ǻ). Results are discussed in relation to other related Schiff base complexes. View Full-Text
Keywords: coordination compounds; crystal structure; Schiff bases; nickel; copper; zinc coordination compounds; crystal structure; Schiff bases; nickel; copper; zinc

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Mautner, F.A.; Fischer, R.C.; Spell, M.; Acevedo, A.R.; Tran, D.H.; Massoud, S.S. Metal(II) Complexes of Compartmental Polynuclear Schiff Bases Containing Phenolate and Alkoxy Groups. Crystals 2016, 6, 91.

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