1 Supporting Information Insight into the connecting roles of interaction synthons and water clusters within different transition metal coordination compounds of pyridine-2,5-dicarboxylic acid: experimental and theoretical studies H. Eshtiagh-Hosseini, M. Mirzaei, * M. Biabani, V. Lippolis, * M. Chahkandi and C. Bazzicalupi Figure S1. 1 H-NMR spectrum of compound 2. Electronic Supplementary Material (ESI) for CrystEngComm This journal is © The Royal Society of Chemistry 2013