Molecular structure in the solid state by X-ray crystallography and SSNMR and in solution by NMR of two 1,4-diazepines

The crystals of two 1,4-diazepines prepared from curcuminoid β-diketones and ethylenediamine were studied by X-ray crystallography and NMR. Their tautomerism, intramolecular hydrogen bonds and conformation were determined.This work was supported by Ministerio de Economía y Competitividad of Spain (CTQ2014-56833-R and CTQ2015-63997-C2-2- P) and Comunidad Autónoma de Madrid (Project MADRISOLAR2, ref. S2009/PPQ-1533). Carla I. Nieto is indebted to UNED for a predoctoral contract >FPI Grupos de Investigación>.Peer Reviewe