The First Two Examples of (R)-2-Chloromandelato Coordination Polymers: Synthesis,Structure, Magnetic and Ferroelectric Properties

Both (R)-2-Chloromandelato coordination polymers, Cu(Clma)₂] _n 1 and Mn(H₂O)(Clma)₂] _n 2, crystallizing in the polar chiral monoclinic space group P2₁ represent the first two examples of metal complexes with (R)-2-Chloromandelic acid (HClma) ligand. Through the (R)-2-Chloromandelate Clma^? ions, the penta- and hexa-coordinated metal atoms in 1 and 2 are linked into chains, _∞ ¹ {Cu(Clma)](Clma)_2/2} _n and _∞ ¹ {Mn(H₂O)(Clma)](Clma)_2/2} _n , respectively, and further assembled into 3D supramolecular architectures via hydrogen bonding and close packing interactions. They exhibit ferroelectricity (Pr = 0.03 and 0.01 μC cm^?2, Ec = 5.09 and 0.52 kV cm^?1, Ps = 0.10 and 0.17 μC cm^?2, respectively). The magnetic behaviors of 1 and 2 can be interpreted by means of a 1D chain model, where the magnetic exchanges are transmitted via carboxylate groups between metal atoms, and the best fit results in J = 2.97, ?0.15 cm^?1 for 1 and 2, suggesting ferromagnetic and antiferromagnetic interactions, respectively.