Sending an existing dict through zmq ipc

I'm trying to send an existing dict through zmq ipc socket, I can send a string with this code, but I can't send a dict object

import zmq, datetimed = {0: ('356612022462768', 'EVENT', 0, '2012-12-26 15:50:16', -20.22216, -70.13723, 6.44, 134.0, 1, 2, '18743230', datetime.datetime(2013, 2, 10, 9, 6, 2, 362734))}if __name__ == "__main__":    context = zmq.Context()    publisher = context.socket(zmq.PUB)    publisher.connect("ipc://shared")    while True:        publisher.send( d )        time.sleep( 1 )

TypeError: {0: ('356612022462768', 'EVENT', 0, '2012-12-26 15:50:16',            -20.22216, -70.13723, 6.44, 134.0, 1, 2, '18743230',            datetime.datetime(2013, 2, 10, 9, 6, 2, 362734))} does not provide a buffer interface.

How can I do that?