I need some quick help with Optical Isomers(Chemistry)?

Ok so the question here is does [Pt(NH3)(N3)ClBr]- exhibit optical isomerism.

Now I already know that it does not but I want to know why?

............NH3................................................................................NH3.....................m
............../....................................................................................../.........................m
Br--------- Pt ------------Cl.............Wouldnt it mirror imagae be...Cl---------Pt-----------Br
............../....................................................................................../.............................m
.............N3...................................................................................N3

Arent these 2 images non-superimposable? Which would mean they do exhibit optical isomerism... now I know I'm messing up here somewhere... I just dont know where.... please help, the first person to help me with this gets the 10 points

2011-05-05T14:48:32Z

NH3 and N3 are meant to be bonded to the top and bottom like before

2011-05-05T15:06:18Z

I think I get what you mean... but I'm still slightly confused, I thought that if the mirror image didnt look like the original, then that meant it wasnt superimposable, and that you couldnt flip around the image to make it so, but in this one you can? like cis-[Co(en)2Cl2]+, it is not superimposable but if you just flip around the image wouldnt it be?

Gervald F2011-05-05T14:50:36Z

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They are superimposable because the geometry is square planar and not tetrahedral. Just turn over the mirror image, and it is identical.