Two mononuclear seven-coordinated macrocycleMn(II) compounds and four new cyanide-bridged MI–MnII (M = Ag, Au) one-dimensional chain complexes have been synthesized and crystallographically characterized: [Mn(L1)Cl2] · H2O (1), [Mn(L2)Cl2]·H2O (2), [Ag(CN)2Mn(L1)][Ag(CN)2] (3), [Ag(CN)2Mn(L2)][Ag(CN)2] · 1.5H2O (4), [Au(CN)2Mn(L1)][Au(CN)2] (5) and [Au(CN)2Mn(L2)][Au(CN)2] · 1.5H2O (6). The structure of the one-dimensional complexes consists of alternating units of [Mn(L)]2+ and [M(CN)2]−, generating a cyanide-bridged cationic polymeric chain with [M(CN)2]− as the counteranion. In all complexes, the coordination geometry of manganese ion is a slightly distorted pentagonal-bipyrimidal with the cyanidenitrogen atoms at the trans positions and N5 or N3O2 coordinating mode in the equatorial plane from ligand L1 or L2. Investigation over magnetic properties of these four one-dimensional complexes reveals the whole very weak antiferromagnetic interaction between neighbouring Mn(II) ions bridged by the long NC–M–CN unit. A best-fit to the magnetic susceptibility of these complexes leads to the magnetic coupling constant of J = −0.065(2), −0.23(3), −0.15(6) and −0.13(5) cm−1 for complex 3, 4, 5, and 6, respectively.
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