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Sulfur as a heteroatom in metallaborane structures: Cyclopentadienylcobalt thiaboranes.
- Source :
-
Polyhedron . Aug2014, Vol. 78, p130-134. 5p. - Publication Year :
- 2014
-
Abstract
- Abstract: The series of cobaltathiaboranes CpCoSB n H n (n =6, 7, 8, 9, 10) related to the experimentally known CpCoSB8H8 and CpCoSB10H10 have been investigated by density functional theory. The lowest energy CpCoSB n H n (n =6–10) structures are the closo deltahedra in accord with expectations for these 2n +2 Wadean skeletal electron systems. In the lowest energy such structures the sulfur atom is located at a lowest degree vertex and the cobalt atom at a highest degree vertex. An alternative bicapped octahedral CpCoSB6H6 structure having the sulfur atom at a degree 3 capping vertex lies only ∼7kcal/mol above the bisdisphenoid global minimum. For the 12-vertex CpCoSB10H10 system the three possible structures based on a B10CoS regular icosahedron lie more than 50kcal/mol in energy below any non-icosahedral structures. The relative energy ordering of ortho<meta<para for these icosahedral CpCoSB10H10 structures is the opposite of the relative energy ordering of para<meta<ortho for the well-known icosahedral dicarbaboranes C2B10H10. One of the low-energy nine-vertex CpCoSB7H7 structures B7CoS-3 (Fig. 3) appears to be a frozen intermediate in the diamond-square-diamond process interconverting two isomeric tricapped trigonal prisms through a capped square antiprism intermediate. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02775387
- Volume :
- 78
- Database :
- Academic Search Index
- Journal :
- Polyhedron
- Publication Type :
- Academic Journal
- Accession number :
- 96246392
- Full Text :
- https://doi.org/10.1016/j.poly.2014.04.041