Crystal structure of catena-diaquabis(1,3-bis(4-pyridyl)propane)cobalt(II) diperchlorate-1,3-bis(4-pyridyl)propane - water (1:3:1), [Co(C13H14N2)2(H2O)2][ClO4]2 · 3C13H14N2 · H2O - Qin Jian-Hua; Zhao Shi-Ju; Wang Jian-Ge; Zhao Bang-Tun (Zeitschrift für Kristallographie - New Crystal Structures, 2007)