Designed layer assembly: a three-dimensional framework with 74% extra-framework volume by connection of infinite two-dimensional sheetsElectronic supplementary information (ESI) available: structure of the AAA stacked pyridine phase, asymmetric unit of 1, structure of phase 2, thermal stability of phase 2. See http://www.rsc.org/suppdata/cc/b2/b211124c/ | Synapse