Bau R, Drabnis MH, Garlaschelli L, Klooster WT, Xie Z, Koetzle TF, Martinengo S
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.
Science. 1997 Feb 21;275(5303):1099-102. doi: 10.1126/science.275.5303.1099.
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.
通过对[四甲基铵]3[H2Rh13(CO)24]进行单晶中子衍射分析，确定了五配位氢原子。氢原子位于Rh13簇的正方锥型空穴中，处于与簇表面Rh4面几乎共面的位置。它们稍微向内朝着簇的中心铑原子位移，H-Rh(中心)和H-Rh(表面)的平均距离分别为1.84(2)和1.97(2)埃。该结果表明，通常仅形成一个键的氢可以在大的金属簇中同时与其他五个原子相连。
