Series of Copper(II) Coordination Polymers Containing Aminopyrazine and Different Carboxylato Bridges: Syntheses, Structures and Magnetic Properties

• Published in: Crystal growth & design Vol. 9; no. 7; pp. 3318 - 3326
• Main Authors: Boonmak, Jaursup, Youngme, Sujittra, Chaichit, Narongsak, van Albada, Gerard A, Reedijk, Jan
• Format: Journal Article
• Language: English
• Published: Washington,DC American Chemical Society 01.07.2009
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Organic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Pressure effects; Weak interactions; Stacking sequence; Molecular structure; Polychelate; Chromophores; Hydrogen bonds; Spacer; Supramolecular structure; Copper compounds; Magnetic structure; Copper; X-ray diffraction analysis; Carboxylates; Magnetic properties; Crystal structure
• ISSN: 1528-7483; 1528-7505
• DOI: 10.1021/cg9001175

Five new copper(II) carboxylate compounds consisting of coordination networks with aminopyrazine (ampyz) spacer [Cu(ampyz)(O2CH)2] n (1), [Cu2(ampyz)(O2C2H3)4] n (2), [Cu2(ampyz)(O2C3H5)4] n (3), [Cu2(ampyz)(O4C4H4)2] n ·nH2O (4), and [Cu(ampyz)(O4C3H2)] n ·2nH2O (5) were synthesized and structurally characterized by X-ray diffraction analyses together with electronic and EPR spectra. Compound 1 reveals a 2D wavy sheet structure. Both 2 and 3 consist of polymeric chains constructed from paddle-wheel (CuNO4)2 chromophores. The structure of 4 consists of a 2D layer built from double-stranded chain of paddle-wheel units connecting ampyz spacers. Compound 5 exhibits a 2D stairlike layer built from malonate anions and μ 2 -ampyz. Besides the various coordinative modes of carboxylates, the ampyz spacer has an influence on the molecular structures either via the ditopic bridging mode or by other weaker interactions, such as hydrogen bonding and π−π stacking, which mainly contribute to the stabilization of the overall supramolecular structures.