One-dimensional structure and long-range antiferromagnetic behaviour of manganese (II) oxalate trihydrate: {[Mn(μ-ox)(H2O)2] · H2O}n

The previously known manganese (II) oxalate trihydrate, MnC2O4 · 3H2O or {[Mn(μ-ox)(H2O)2] · H2O}n (1) (ox = oxalate), has been synthesized by a novel method with the formation of single crystals, which are suitable for X-ray determination. The result shows that Mn atoms are bis-bidentately bridged by oxalates in cis-configuration to form a one-dimensional chain structure. Magnetic measurement reveals intra-chain antiferromagnetic coupling between MnII ions in 1 with J = −1.07 cm−1. Specific heat measurement exhibits a sharp peak at TN = 2.82(5) K for 1 due to long-range antiferromagnetic ordering, for which the interchain hydrogen bonds should be responsible.