Synthesis of specific isomers of [CoCl2(NH3)4]Cl


The formation of the two isomers shown above, show how changes in reaction conditions can result in the production of different isomers. Reaction of [Co(CO3)(NH3)4]+ with concentrated HCl produces the cis isomer. However reaction of [Co(NH3)6]3+ with a mixture of HCl and H2SO4 gives the trans isomer.