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metal-organic compounds
The crystal structure of trans-tetraaquabis[1,3,5-triazine-2,4,6-tricarbodiimidato(1-)-N]cobalt(II) hexahydrate, [Co(C6H2N9)2(H2O)4].6H2O, shows the cobalt(II) metal ion to be octahedrally coordinated by two trans doubly protonated tricyanomelamine ligands and four water molecules. Hydrogen bonding between ligands yields a two-dimensional sheet structure.