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

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• 作者：Jaursup Boonmak ; Sujittra Youngme ; Narongsak Chaichit ; Gerard A. van Albada ; Jan Reedijk
• 刊名：Crystal Growth & Design
• 出版年：2009
• 出版时间：July 1, 2009
• 年：2009
• 卷：9
• 期：7
• 页码：3318-3326
• 全文大小：439K
• 年卷期：v.9,no.7(July 1, 2009)
• ISSN：1528-7505

文摘

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 μ₂-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.