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Citation: CHEN You-Cun, LIU Guang-Xiang, XU Heng. Molecular Magnets Based on a Schiff-base Complex:Synthesis,Crystal Structures and Magnetic Properties[J]. Chinese Journal of Applied Chemistry, ;2005, 22(6): 615-618. shu

Molecular Magnets Based on a Schiff-base Complex:Synthesis,Crystal Structures and Magnetic Properties

1.
Department of Chemistry, Anqing Normal College, Anqing 246003

Corresponding author: CHEN You-Cun,
Received Date: 26 July 2004
Available Online: 7 November 2004
Fund Project: 国家自然科学基金(20171001,20371002) (20171001,20371002)安徽省教育厅自然科学基金(2003kj251)资助项目 (2003kj251)

A new schiff-base compound,[NiL]ClO₄(1),was synthesized and characterized,where L represents the 1:1 condensation product of salicylaldehyde with diethyltriamine.The crystal structure of compound 1 shows that the Ni²⁺ ion in the NiL⁺ moiety bonded with one O atom and three N atoms of the schiff-base ligand,L^-,and exhibits a near square coordination geometry.The H-bonding interaction between neighboring NiL⁺ and ClO₄^- ions do not form H-bonding network.The temperature dependence of magnetic susceptibility (1.8~300 K) indicates that compound 1 is diamagnetic.The compound with stoichiometry of [NiL][Fe^ⅡFe^Ⅲ(ox)₃](2) was prepared by mixing the aqueous solutions of compound 1,K₃[Fe(ox)₃]·3H₂O and FeSO₄·7H₂O under N₂ atmosphere at ambient temperature.The IR spectrum of compound 2 illustrates that all the oxalate groups function as bridging groups,and compound 2 is actually a coordination polymer.The magnetic susceptibility measurement result at 1.8~300 K shows that this polymer possesses the anti-ferromagnetic ordering at below 11 K;the magnetic behavior above 60 K can be explained by the Curie-Weiss law,and the best fit for the magnetic susceptibility data at above 65 K gives a Curie-Weiss constant of 10.40(2) emu·K/mol and a Weiss temperature -22.9(4)K,respectively.
- Schiff-base,
- coordination polymer,
- crystal structure,
- magnetic property
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