The crystal structure of poly[diaqua-μ 2 -3-nitrophthalato-κ 2 O:O′)-(μ 2 -1-(1-imidazolyl)-4-(imidazol-1′-ylmethyl)benzene-κ 2 N:N′)cobalt(II) tetrahydrate, C 21 H 27 N 5 O 12 Co | Synapse