Synthesis, Structures, and Magnetism of Three 1D Mn^III Chains with Oxazoline-Based Ligands

Three novel MnIII polymers, [Mn(phox)2(N3)]n (1), [Mn(Etphox)2(N3)]n (2), and [Mn(Etphox)2(C2N3)]n (3), using achiral ligand Hphox (Hphox = 2-(4,5-dihydrooxazol-2-yl)phenol) and chiral ligand HEtphox (HEtphox = 2-(4-ethyl-4,5-dihydrooxazol-2-yl)phenol) were synthesized and structurally and magnetically characterized. All complexes are of 1D chain structures and form 2D frameworks by weak interactions. The adjacent 1D chains of complex 1 are connected by face-to-face π−π interactions, C−H···π interactions, and hydrogen bonding, which leads to the formation of a supramolecular 2D sheet structure. The three compounds show antiferromagnetic coupling between MnIII ions. And compound 2 is a spin-canted weak ferromagnet with TN = 5.6 K, showing metamagnetic behavior with a two-step magnetic phase transition.