Hi Adrian,
The N2K-2232TM-E is not supported in the Nexus 7000 at this stage. You'll see it's not currently shown in the Cisco Nexus 7000 Series NX-OS Release Notes, Release 6.1 as a supported FEX model.
The last I've found from Cisco on this is in a Community document Nexus 2232TM VS 2232TM-E dated June 2013:
At this current stage, 2232TM-E is supported with N5K as parent