The pentaamminecobalt(III) carbonate chloride isomer can be represented as: [Co(NH3)5CO3]+Cl-
The pentaamminecobalt(III) chloride carbonate isomer can be represented as: [Co(NH3)5Cl]+CO3^2-
Both isomers have the same empirical formula, but they differ in the arrangement of the carbonate and chloride ions around the central cobalt(III) ion.
It is important to note that the naming conventions for these complexes can vary based on the source and it is always good to check for any specific naming conventions that should be followed in a particular context.