Syntheses, Characterization, and Magnetic Properties of Four New Layered Transition-Metal Hydroxyl−Carboxylate−Phosphonates:  [M(CH(OH)(CO₂)(PO₃H))(H₂O)₂] (M = Mn, Fe, Co, Zn)

Four new layered transition-metal hydroxyl−carboxylate−phosphonates, [M(CH(OH)(CO₂)(PO₃H))(H₂O)₂] (M = Mn (1), Fe (2), Co (3), Zn (4)), have been successfully hydrothermally synthesized and characterized by single-crystal X-ray diffraction as well as with elemental analysis, infrared spectroscopy, thermogravimetric analysis, and magnetic measurement. These isomorphous compounds crystalline in the monoclinic space group P2₁/c with a = 5.678(2)−5.800(2) Å, b = 15.469(6)−15.664(5) Å, c = 7.846(3)−7.911(2) Å, β = 109.287(4)−110.332(3)°, V = 649.5(4)−676.5(4) ų, and Z = 4. In these compounds, transition-metal [MO₆] (M = Mn, Fe, Co, Zn) octahedra and [PCO₃] tetrahedra are connected to each other through corners into an infinite wriggled chain. Carboxylate and hydroxyl groups interlace the chain to form an organic−inorganic hybrid layered structure. The results of magnetic measurements revealed the presence of antiferromagnetic interactions of M(II) ions (M = Mn, Fe, Co) in compounds 1−3, respectively.