Hydrothermal reaction of CoCl 2 · 6H 2 O, H 6 chhc (all-cis-1,2,3,4,5,6-cyclohexanehexacarboxylic acid), phen (1,10-phenanthroline), and NaOH in aqueous solution afforded a new coordination polymer Co(phen)(H 2 O)(H 2 chhc) 1/2 , which crystallizes in the space group P1 with the cell constants a = 7.267 (2)