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The nearest-neighbour separations of the optimised geometries of compounds 2, 3, and 4 do not differ significantly from those computed for many related boranes and carboranes, i.e. they span the intervals of 1.71-1.86 Å for B-B and 1.58-1.69 Å for C-B (C-C in 4 was computed to be 1.534 Å, a value very close to that which appears in alkanes). The only exceptions are the extremely long B-B distances in 2 and 3: 2.000 Å for B(11)-B(14) and 1.949 Å for B(4)-B(11) in 2 and 3, respectively. The first distance is in very good accord with 2.009(2) Å as determined by the single-crystal X-ray diffraction analysis. The optimised geometries served as inputs for magnetic properties calculations. Comparisons of calculated shifts with experimental values reveal satisfactory agreement and, therefore, the calculations provide a good ground for believing that the RMP2(fc)/6-31G* internal coordinates can be deemed as good representations of the molecular geometries for these three compounds in their solutions
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