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7849887 
Journal Article 
A New Manganese Coordination Polymer Based on Azobenzene Tetracarboxylate and Auxiliary Pyridine Lingand: Synthesis, Crystal Structure and Magnetic Property 
Feng Xun; Shang Ya-Pei; Wang Li-Ya; Hong Man-Zhou; Fang Hai-Peng; Zhao Xin; Li Zhong-Jun 
2021 
Yes 
Chinese Journal of Structural Chemistry
ISSN: 0254-5861 
40 
2 
217-224 
WOS:000628844200010 
A new manganese coordination polymer (CP) has been synthesized under hydrothermal conditions. It's formula is {Mn-2(Oaobtc)(bpe)(H2O)(4)]}(n), where H(4)Oobtc oxide azobenzene 2,2',3,3'-tetracarboxyl acid, and bpe is 1,2-bis(4-pyridine) ethylene. It was characterized by elemental analysis, infrared spectrum and X-ray single-crystal diffraction. The coordination polymer crystallizes in the monoclinic system, space group p2(1/)c. The central ion was coordinated with H(4)Oobtc ligands using bridging model, and carboxylic group connects two adjacent Mn(II) ions dimer units. The oxygen from carboxylates connect these dimer units into a one-dimentional (1D) chain, and N atoms from the bpe further expanded them into three-dimentional (3D) supramolecular edifice, eventually. Variable-temperature magnetic measurements of CP 1 indicate the presence of weak antiferromagnetic exchange between two nearest Mn(II) ions with J = -0.367 cm(-1). 
accate bridging; manganese(II); X-ray crystal structure; oxidation azoxybenzene-2,2 ',3,3 '-tetra-carboxyl acid; antiferromagnetic interaction