International Union of Crystallography
Acta Crystallographica Section C
The crystal structure of the 'non hydrogen-bonded' (according to IR data) polymorph of 1,7-bis(phenylcarbamoyl)-1,7-dicarba-closo-dodecaborane(12), C16-H22B10N2O2, has been determined. The two phenylamide groups have a Z configuration [the torsion angles 0-C-N-C are -2.3 (5) and -3.0 (5)°]. As a result both 'active' protons of these groups are almost completely shielded by other H atoms of the neighbouring carborane nucleus and phenyl substituents, and, therefore, no hydrogen-bonding contacts are found.
Lindeman, Sergey V.; Kats, Georgii A.; and Komarova, Lyudmila G., "An m-Carboranedicarboxylic Acid Dianilide" (1994). Chemistry Faculty Research and Publications. 594.