1. Centre for Nanoporous Materials, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K., Department of Physical, Inorganic and Structural Chemistry, Stockholm University, 10691 Stockholm, Sweden, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K., and Graduate School of EEWS (WCU), KAIST, Taejon 305-701, Korea