title: Tetra-aqua-bis-(2-methyl-1H-imidazole-κN)cobalt(II) naphthalene-1,5-disulfonate.
abstract: In the title complex, [Co(C(4)H(6)N(2))(2)(H(2)O)(4)](C(10)H(6)O(6)S(2)), the cation and anion both reside on crystallographic inversion centers, such that the asymmetric unit comprises one half cation and one half anion. The central Co(II) ion is coordinated by four water mol-ecules and two 2-methyl-imidazole ligands, resulting in a trans-octa-hedral coordination geometry. The existence of strong N-H⋯O and O-H⋯O hydrogen-bonding inter-actions gives rise to a three-dimensional structure.
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing 211189,  People's Republic of China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Jin