摘要:
Three new metallacarboranes, closo-1-(eta-C5H5)Co-2-(NC)-2,3-C2B10H11, 1, nido-2-(eta-C5H5)Fe-8-(CH3OC(O))-6,7,8,9-C4B7H11, 2, and arachno-2-(eta-C5H5)Co-8-(CH3OC(O))-7,8,9,10-C4B7H12, 3, having cage structures derived from supraicosahedral frameworks, have been produced from metal-insertion reactions of the arachno-8-(NC)-7,8-C2B10H14- and arachno-8-(CH3OC(O))-7,8,9,10-C4B8H12- anions. A structural determination of 1 showed it adopts a distorted closo-docosahedral geometry similar to those previously reported for isoelectronic 13-vertex metallacarboranes. Structural determinations of 2 and 3 showed that they both have open frameworks with that of 2 based on a docosahedron missing one vertex, and that of 3 based on a bicapped hexagonal antiprism missing two vertices. (C) 1998 Elsevier Science S.A.