Crystal structure of tri-aqua-(2,6-di-methyl-pyrazine-κN (4))bis-(thio-cyanato-κN)manganese(II) 2,5-di-methyl-pyrazine disolvate.

Abstract

In the crystal structure of the title complex, [Mn(NCS)2(C6H8N2)(H2O)3]·2C6H8N2, the MnII cation is coordinated by two terminally N-bonded thio­cyanate anions, three water mol­ecules and one 2,6-di­methyl­pyrazine ligand within a slightly distorted N3O3 octa­hedral geometry; the entire complex mol­ecule is generated by the application of a twofold rotation axis. The asymmetric unit also contains an uncoordinating 2,5-di­methyl­pyrazine ligand in a general position. Obviously, the coordination to the 2,6-di­methyl­pyrazine ligand is preferred because coordination to the 2,5-di­methyl­pyrazine is hindered due to the bulky methyl group proximate to the N atom. The discrete complexes are linked by water-O—H⋯N(2,6-di­methyl­pyzazine/2,5-di­methyl­pyza­zine) hydrogen bonding, forming a three-dimensional network. In the crystal, mol­ecules are arranged in a way that cavities are formed in which unspecified, disordered solvent molecules reside. These were modelled employing the SQUEEZE routine in PLATON [Spek (2015 ▸). Acta Cryst. C71, 9–18]. The composition of the unit cell does not take into account the presence of the unspecified solvent.