Abstract
Reaction of manganese(II) thiocyanate with the monodentate ligand 4-benzylpyridine (bp) leads to the formation of two compounds of composition Mn(NCS)2(4-benzylpyridine)4 (1-bp) and Mn(NCS)2(4-benzylpyridine)2 (2-bp). Compound 1-bp forms discrete complexes in which the Mn cations are coordinated by four 4-benzylpyridine ligands and two terminal N-bonding thiocyanato anions within slightly distorted octahedra. In compound 2-bp the metal cations are surrounded by two cis-coordinating 4-benzylpyridine ligands, two cis-coordinating S-bonded thiocyanato anions and two trans-coordinating N-bonded anionic ligands. The Mn cations are linked into zig–zag-like chains by pairs of μ-1,3-bridging anionic ligands. DTA–TG measurements on 1-bp prove that 2-bp is obtained as intermediate. Magnetic measurements on the chain compound 2-bp show dominating antiferromagnetic interactions between the Mn centers. On cooling a maximum is observed in the susceptibility curve indicative for an antiferromagnetic transition. The results of the magnetic measurements are compared with those obtained for other Mn thiocyanato chain compounds in which the thiocyanato anions are trans-coordinated.
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