A novel three-dimensional porous coordination polymer, [Co-2(HBTC)(BTC)(EtOH)(2)]center dot Et3NH center dot EtOH center dot 6H(2)O (1) has been synthesized in ethanol at room temperature with 1,4-cyclohexanedicarboxylic acid (1,4-H2CDC) as an additive. The final product of the reaction is found to be dependent upon the solvent and additive employed. When the solvent is changed from ethanol to dimethylformamide, another complex, [Co-6(BTC)(4)-(mu-OH2)(DMF)(2)(H2O)(8)]center dot 4DMF center dot 5H(2)O (2) is instead obtained. Without H2CDC, a two-dimensional framework, [Co-3(H2BTC)-(HBTC)(BTC)(H2O)(6)]center dot 2H(2)O (3), is produced in either solvents.