G. Meyer et S. Uhrlandt, THE 1ST TRIGONAL-BIPYRAMIDAL CLUSTER WITH AN INTERSTITIAL C2 UNIT - [RB(PR5(C2))CL10], Angewandte Chemie, International Edition in English, 32(9), 1993, pp. 1318-1319
Nine Cl atom bridge the edges of the compressed trigonal bipyramid (st
abilized by the incorporated carbon pair) of the central [{Pr5(C2)}(Cl
21)] unit of the title compound (picture on the right). In addition th
ree terminal Cl atoms bind to each apex of the bipyramid and two each
to the Pr atoms of the pyramidal base. Till now only tetrahedral and o
ctahedral clusters of metal-rich lanthanide halides were known.