Spin Canting and Topological Ferrimagnetism in Two Manganese(II) Coordination Polymers Generated by In Situ Solvothermal Ligand Reactions

Abstract

AbstractTwo manganese(II) coordination polymers, [Mn2(bpt)(pa)2(N3)]n [1; Hpa = picolinic acid, Hbpt = 3,5‐bis(2‐pyridyl)‐4H‐1,2,4‐triazole] and [Mn3(ina)2(pa)2(N3)2]n (2; Hina = isonicotinic acid), have been synthesized by solvothermal treatment, in which the ligands bpt and pa were generated in situ by cyclocondensation and hydrolysis of 2‐pyridylamidrazone, respectively. In 1, each binuclear subunit [Mn2(bpt)(N3)] bridged by bpt and N3– ligands is interlinked to four adjacent subunits via four tridentate pa ligands into a diamondoid 3D network, which shows spin‐canting magnetism arising from the lack of inversion centers between the interacting spin centers. In 2, the MnII ions are alternately connected by double μ1,3‐carboxylate/μ1,1‐azide and double μ1,1‐carboxylate bridges into a 1D magnetic chain, which exhibits a topological ferrimagnetic behavior in an antiferromagnetic‐antiferromagnetic‐ferromagnetic sequence. These chains are further interlinked via ina ligands into a 2D network.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)