Intra- and inter-molecular carboranyl C–H⋯N hydrogen bonds in pyridyl-containing ortho-carboranesElectronic supplementary information (ESI) available: rotatable 3-D molecular structure diagrams of experimental structures of 1–4 and of MP2/6-31G* optimised geometries 1a–7b in CHIME format. Computed GIAO NMR data for 1b–4c. See http://www.rsc.org/suppdata/dt/b2/b209931d/