[pisatajay2009]

can anyone please help out?

i need to know the no. of isomers of tetraamminecarbonato cobalt(III) bromide.
if structures are known ,please show them.
i have checked a lot of books but could not find isomers of [MA4(B-B)]

[AWK]

Do you think isomers sre possible for this complex?
http://www.3dchem.com/inorganicmolecule.asp?id=195

Start from A.F Wells - Structural inorganic chemistry
This compound was obtained almost 50 years ago.

[pisatajay2009]

our professor had given CO3(2-) ie carbonato group to be acting as a unidentate, and with the bromide it will form cis and trans isomers and one like the the structure which you have given.
but my question is that whether in your structure , the carbonato can attach to cobalt like a sort of trans structure?
i mean your structure shows adjacent bonds from oxygen to cobalt ,but can it show alternate bonds??

[AWK]

But then this formula [Co(NH3)4CO3]Br is incorrect - it indicate Br^- is outside the coordination sphere

[pisatajay2009]

 had it been the same formula without the square brackets, then how many isomers would be possible??

[AWK]

Look, where you can locate Br and CO3 at the vertices of octahedron (two possibilities)