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Journal of Synthetic Crystals ›› 2025, Vol. 54 ›› Issue (11): 1974-1982.DOI: 10.16553/j.cnki.issn1000-985x.2025.0071

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Synthesis, Crystal Structure and Magnetic Properties of Metal Organic Cobalt Phosphonates Complexes Based on Chiral/Racemic Ligands

SUN Wentao(), XU Yan(), FENG Lushun, MENG Wenqing, ZHENG Weijian, LI Xinxing, LI Suzhi()   

  1. Department of Chemistry,School of Biological and Materials Engineering,Suqian University,Suqian 223800,China
  • Received:2025-04-08 Online:2025-11-20 Published:2025-12-11

Abstract: A pair of enantiomeric complexes with formulas S/R- [Co6(cpap)4(1,2-dpe)4(H2O)5]·8H2O (S-1 or R-1) and related racemic compound rac-[Co3(cpap)2(1,2-dpe)2(H2O)2]·4H2O (rac-2) (1,2-dpe=1,2-di(4-pyridyl)ethylene, S- or R-cpapH3=S- or R-3-cyclohexyl-2-((phosphonomethyl)amino)propanoic acid) were assembled under hydrothermal conditions. The composition and structure of the complexes S-1, R-1 and rac-2 were characterized by X-ray single crystal diffraction, X-ray powder diffraction, infrared spectroscopy, and elemental analysis. Complexes S-1,R-1 and rac-2 show identical three-dimensional open framework structures. The crystal structure contains inorganic chains with alternating mononuclear and dinuclear units bridged by O—P—O linkages. Each chain is composed of dinuclear cobalt eight-membered rings (Co2(PO22) interconnected through mononuclear cobalt ((P)O—Co—O(P)) bridges. Neighboring chains are connected to each other by hydrogen bonds to form 2D layers, which are further cross-linked by the auxiliary ligand 1, 2-dpe to form a 3D supramolecular open network structure. The thermal stability, chiral optical activity and magnetic properties of complexes S-1,R-1 and rac-2 were investigated.

Key words: cobalt (Ⅱ) complex; crystal structure; chirality; racemization; magnetic property

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