title: Five-Coordinate Hydrogen: Neutron Diffraction Analysis of the Hydrido Cluster Complex
abstract: Pentacoordinate hydrogen atoms were identified by single-crystal neutron diffraction analysis of [N(CH3)4]3[H2Rh13(CO)24]. The hydrogen atoms are located in square pyramidal cavities of the Rh13 cluster, in positions almost coplanar with the Rh4 faces on the surface of the cluster. They are slightly displaced inward, toward the central rhodium atom of the cluster, with average H-Rh(central) and H-Rh(surface) distances of 1.84(2) and 1.97(2) angstroms, respectively. This result shows that hydrogen, which normally forms only one bond, can be attached to five other atoms simultaneously in a large metal cluster.
authors.affiliation: R. Bau, M. H. Drabnis, Z. Xie, Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA. L. Garlaschelli and S. Martinengo, Dipartimento di Chimica Inorganica, Metallorganica e Analytica, Universita di Milano, Via G. Venezian 21, Milano 20133, Italy. W. T. Klooster and T. F. Koetzle, Chemistry Department, Brookhaven National Laboratory, Post Office Box 5000, Upton, NY 11973, USA.
authors.initials: R
authors.lastname: Bau
authors.initials: MH
authors.lastname: Drabnis
authors.initials: L
authors.lastname: Garlaschelli
authors.initials: WT
authors.lastname: Klooster
authors.initials: Z
authors.lastname: Xie
authors.initials: TF
authors.lastname: Koetzle
authors.initials: S
authors.lastname: Martinengo