The synthesis, structure, and magnetic properties of two novel manganese(ii) azido/formate coordination polymers with isonicotinic acid N-oxide as a coligand

Abstract

Two novel azide/formate manganese(II) coordination polymers, based on isonicotinic acid N-oxide, [Mn₂L₂(N₃)₂(CH₃OH)]_n (1), and [MnL(HCO₂)]_n (2) [HL = isonicotinic acid N-oxide (INO)] have been synthesized under solvothermal conditions and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The structure of 1 consists of unprecedented 1D chains built by double syn,anti carboxylate bridges, double EE azide and mixed bridges of syn,syn carboxylate and the N-oxide group, which are further linked through azido (EE) and INO to generate a unique 3D framework. Complex 2 is a 2-fold interpenetrating pcu net based on hexanuclear Mn₆ clusters, which are formed by the linkage of six Mn^II ions with six syn,syn,anti formate anions and six syn,syn carboxylate groups. Magnetic susceptibility measurements reveal that dominant antiferromagnetic coupling exists between the Mn^II ions in 1 and 2.