Publications with shared reference: Helical geometry and liquid crystalline properties of 2,3,6,7,10,11-hexaalkoxy-1-nitrotriphenylenesElectronic supplementary information (ESI) available: calculation of dipolar interactions, details of syntheses and analytical data, DSC data, and full details of the single-crystal structure factors plus projections along the crystallographic axes. See http://www.rsc.org/suppdata/jm/b2/b211133k/