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

Two manganese(II) coordination polymers, [Mn 2 (bpt)(pa) 2 (N 3 )] n [ 1 ; Hpa = picolinic acid, Hbpt = 3,5‐bis(2‐pyridyl)‐4 H ‐1,2,4‐triazole] and [Mn 3 (ina) 2 (pa) 2 (N 3 ) 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 [Mn 2 (bpt)(N 3 )] bridged by bpt and N 3 – 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 Mn II ions are alternately connected by double μ 1,3 ‐carboxylate/μ 1,1 ‐azide and double μ 1,1 ‐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)