Self-assembly hydrogen-bonded supramolecular arrays from copper(II) halogenobenzoates with nicotinamide: Structure and EPR spectra
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- 作者：Jozef Halaška ; Danica Čechová ; Michael K. Lawson ; Zdeňka Růžičková…
- 关键词：copper(II) complexes ; nicotinamide ; crystal structure ; EPR ; supramolecular network
- 刊名：Chemical Papers
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：70
- 期：1
- 页码：101-113
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering; Biochemistry, general; Medicinal Chemistry; Materials Science, general; Biotechnology;
- 出版者：Springer International Publishing
- ISSN：1336-9075
- 卷排序：70
文摘
Nicotinamide was employed as a supramolecular reagent in the synthesis of six new copper(II) bromo-, iodo-, fluoro- and dibromobenzoate complexes. Structures of [Cu(2-Brbz)2(nia)2(H2O)2] (I), [Cu(2-Ibz)2(nia)2(H2O)2] (II), [Cu(2-Fbz)2(nia)2(H2O)2] (III), [Cu(4-Brbz)2(nia)2(H2O)2] (IV), [Cu(3,5-Br2bz)2(nia)2(H2O)2] (V), [Cu(F-Fbz)2(nia)2(H2O)] · H2O (VI) (nia = nicotinamide, 2-Brbz = 2-bromobenzoate, 4-Brbz = 4-bromobenzoate, 3,5-Br2bz = 3,5-dibromobenzoate, 2-Ibz = 2-iodobenzoate, 2-Fbz = 2-fluorobenzoate, 4-Fbz = 4-fluorobenzoate) were determined using X-ray analysis. Compound [Cu(2-Brbz)2(nia)2] · 2H2O (VII) was prepared by a new method and also characterized by X-ray powder diffraction and EPR spectroscopy. Compounds I–V are monomeric complexes with a square-bipyramidal coordination sphere around the Cu2+ ion. Complex VI is monomeric with coordination environment around the Cu2+ ion of a tetragonal-pyramid. Complexes I and VII present examples of coordination isomerism. Molecules of all compounds are connected by N—H⋯O and O—H⋯O hydrogen bonds from the NH2 groups of nicotinamide and water molecules which create supramolecular hydrogen-bonding-coordination chains and networks.