From crystal to crystal: a new polymorph of (4-carboxylatopyridine)silver(i) by topotactic dehydration of its monohydrateThis article is part of a themed issue on Coordination polymers: structure and function.Electronic supplementary information (ESI) available: IR spectra of 1(as synthesized and stored over a saturated solution of NaCl) and 2α(obtained after drying 1for 12 h in vacuum); powder diffractograms of 1and 2α; and channels in 1occupied by water molecules. CCDC reference numbers 766378(1) and 766379(2α). For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c0nj00144a