Cornering the 13th vertex: The first 13‐vertex carborane (see picture, B: brown, C: gray, H: white) has been prepared by a methodology that can in principle be applied repeatedly, leading to 14‐, 15‐, 16‐, …︁ vertex carboranes in the future. The 13‐vertex species has a henicosahedral geometry, not the docosahedral one expected, but the two forms are found to be very close in energy by DFT calculations.
Betrifft die 13. Ecke: Das erste 13‐eckige Carboran (siehe Bild; B: braun, C: grau, H: weiß) wurde mithilfe eines Verfahrens hergestellt, das prinzipiell wiederholt angewendet werden kann, sodass künftig auch 14‐, 15‐, 16‐ und mehr‐eckige Carborane zugänglich sind. Das 13‐eckige Molekül hat eine henikosaedrische und keine dokosaedrische Geometrie wie ursprünglich angenommen. Beide Konfigurationen sind gemäß DFT‐Rechnungen energetisch ähnlich.
Reaction of Na2[7,9-C2B10H12] or its C-dimethyl analogue with SnCl2 in THF affords 4,1,6-closo-SnC2B10H12 or 1,6-Me2-4,1,6-closo-SnC2B10H10 respectively, the first 13-vertex metallacarboranes involving p-block metals; spectroscopic, structural and theoretical studies, including an analysis of fluctionality in solution, are reported.
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