Boer, StephanieMorshedi, MahbodTarzia, AndrewDoonan, Christian J.White, Nicholas2020-09-160947-6539http://hdl.handle.net/1885/210524While numerous hydrogen‐bonded organic frameworks (HOFs) have been reported, typically these cannot be prepared predictably or in a modular fashion. In this work, we report a family of nine diamondoid crystalline porous frameworks assembled via hydrogen bonding between poly‐amidinium and poly‐carboxylate tectons. The frameworks are prepared at room temperature in either water or water/alcohol mixtures. Importantly, both the cationic and anionic components can be varied and additional functionality can be incorporated into the frameworks, which show good stability including to prolonged heating in DMSO or water.N.G.W. and C.J.D. thank the Australian Research Council for fundingapplication/pdfen-AU© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim201910.1002/chem.2019021172024-03-03