That lithiated aromatic amines with more than one nitrogen atom can favor polymeric aggregates in the solid state is demonstrated by the single crystal X-ray diffraction structure of [N-lithio-benzimidazole(DMSO)2]∞ 4; ab initio calculations on model compounds and simple electrostatic models indicate that the preference of the polymeric structure over dimeric alternatives is due to resonance stabilization and to Coulomb attraction between alternating benzimidazole anions and lithium cations.
The 12 cage-anchoring points of the very stable icosahedral ortho-, meta-, and para-carborane allow the design of multidimensional architectures provided new self-assembling routes are devised. We provide bases for constructing carborane molecular architectures through high-level quantum chemical computations. We consider ejection mechanisms for the inner atom/ion in endohedral carborane complexes, singlet-triplet energy gaps in carborane biradicals, as well as geometry reorganization in carborane neutral and dianionic triplet states. These features, explored in monomers, are starting points for the design of molecular architectures based on electronic structure properties of carborane assemblies.