doi:10.1016/j.jssc.2022.123071engChamorro-Posada, PedroDante, Roberto C.Vázquez-Cabo, JoséDante, Denisse G.Martín-Ramos, PabloRubiños-López, ÓscarSánchez-Arévalo, Francisco M.From urea to melamine cyanurate: Study of a class of thermal condensation routes for the preparation of graphitic carbon nitrideART-2022-127962This work presents a survey of the intermediates in the well-known thermal synthesis of graphitic carbon nitride from urea. The analysis of the crystalline phases depicts a successive transformation of the precursor into different substances previously used as starting reactants, whereby melamine cyanurate arises as the ultimate precursor of a class of thermal condensation routes to obtain graphitic carbon nitride. The study of the optical properties of the synthesized materials evidences the simultaneous production of an amorphous phase with a significant presence of melon oligomers. These results are also supported by the further characterization of the materials performed using THz-TDS, FTIR, HRTEM, and XPS techniques, and by theoretical studies conducted using semi-empirical quantum chemistry methods.2022http://zaguan.unizar.es/record/11206310.1016/j.jssc.2022.123071http://zaguan.unizar.es/record/112063oai:zaguan.unizar.es:112063info:eu-repo/grantAgreement/ES/MICINN/PID2020-119418GB-I00JOURNAL OF SOLID STATE CHEMISTRY 310 (2022), 123071 [10 pp.]by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess