Structural chemistry and magnetic properties of copper pyromellitate coordination polymers containing pyridylnicotinamide ligands
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- 作者：Jessica E. Mizzi ; Robert L. LaDuca
- 关键词：Hydrothermal synthesis ; Copper ; Magnetism ; Coordination polymer ; Crystal structure
- 刊名：Inorganica Chimica Acta
- 出版年：24 February, 2014
- 年：2014
- 卷：411
- 期：Complete
- 页码：188-198
- 全文大小：2964 K
文摘
A series of divalent copper pyromellitate (1,2,4,5-benzenetetracarboxylate, pyro) coordination polymers containing either 3-pyridylnicotinamide (3-pna) or 4-pyridylnicotinamide (4-pna) was hydrothermally prepared and structurally characterized by single-crystal X-ray diffraction. [Cu2(pyro)(pyroH2)(3-pnaH)2(H2O)2]n (1) is a 2-D coordination polymer built from {Cu2O2(OCO)2} dimeric units, while {[Cu(pyro)(3-pnaH)2(H2O)2]路4H2O}n (2) is a simple neutral 1-D chain polymer. {[Cu(pyroH2)(4-pnaH)2(H2O)2](pyroH2)路2H2O}n (3) possesses cationic 1-D chain motifs and unligated pyroH2 dianions. {[Cu2(pyroH2)3(4-pnaH)2]路6H2O}n (4) is also a 1-D coordination polymer, but built from the linkage of {Cu2(pyroH2)} dimeric units. {[Cu3(pyroH)2(4-pna)2(H2O)2]路2H2O}n (5) manifests a 3-D coordination polymer network with rare frl topology, containing embedded {Cu3(OCO)2} linear trimers. Moderately strong antiferromagnetic coupling (J = 鈭?6.4(3) cm鈭?) was observed within the {Cu2O2(OCO)2} dimeric units in 1, while very weak ferromagnetic coupling (J = 0.8(2) cm鈭?) was observed within the {Cu3(OCO)2} linear trimers in 5. Thermal degradation behavior of the five new materials is also presented.