Influence of the ancillary ligand on the crystalline structures and magnetic properties of mesaconato-bridged Mn coordination polymers

Abstract

{[Mn(mes)(dmb)(H2O)] ·H2O}n (1) and [Mn(mes)(bpy)]n (2); (mes= mesaconato; dmb=5,5’-dimethyl-2,2’-bipyridine; bpy=2,2’-bipyridine), were obtained by self-assembly solution reaction at ambient conditions, and structurally characterized by single crystal X-ray diffraction. 1 crystallizes in an orthorhombic system with a Pbca space group and forms a one-dimensional (1D) coordination polymer; the six-coordinated Mn(II) centers display a distorted-trigonal prismatic configuration. 2 crystallizes in an orthorhombic system with a P21212 space group yielding a twodimensional (2D) coordination array, their metal centers having a distorted octahedral geometry. Magnetic susceptibility measurements reveal that 1 is paramagnetic, while 2 shows weak antiferromagnetic coupling.