A dimanganese(II) complex with bridging chlorides: Synthesis, electrochemistry, magnetic behavior, structure and bonding

The synthesis of dimeric [Mn(2)Cl(2)(mu-Cl)(2)(dipa)(2)]center dot MeOH (3) (dipa = dipyridylmethylamine) from [MnCl(2)(H(2)O)(4)] (1) and dipa (2) and its structural characterization is reported. In the solid state complex 3 is dimeric and possesses crystallographically imposed C(2) symmetry, which differs from similar dimanganese(II) complexes showing an inversion symmetry for the central Mn(mu-Cl)(2)Mn arrangement. Each manganese atom is thereby bound by three nitrogen atoms from a facially coordinated dipa ligand, and three chlorides (1 terminal and 2 mu-bridging) in an octahedrally distorted fashion. The cylovoltammogram of 3 displays that the two manganese(II) ions can independently be oxidized. The magnetic properties of 3 were determined by susceptibility measurements versus temperature. The intramolecular J parameter was determined to a value of J = (-5.2 +/- 0.5) cm (1).