doi:10.3390/s16050658engSchiller, J.Pérez-Ruiz, R.Sampedro, D.Marqués López, María EugeniaPérez Herrera, RaquelDíaz, D. D.Fluoride anion recognition by a multifunctional urea derivative: An experimental and theoretical studyART-2016-95042In this work we demonstrate the ability of a multifaceted N, N'-disubstituted urea to selectively recognize fluoride anion (F-) among other halides. This additional function is now added to its already reported organocatalytic and organogelator properties. The signaling mechanism relies on the formation of a charge-transfer (CT) complex between the urea-based sensor and F- in the ground state with a high association constant as demonstrated by absorption and fluorescence spectroscopy. The nature of the hydrogen bonding interaction between the sensor and F- was established by 1H-NMR studies and theoretical calculations. Moreover, the recovery of the sensor was achieved by addition of methanol.2016http://zaguan.unizar.es/record/5606910.3390/s16050658http://zaguan.unizar.es/record/56069oai:zaguan.unizar.es:56069info:eu-repo/grantAgreement/ES/CSIC/PIE-201580I010info:eu-repo/grantAgreement/ES/DGA/E104info:eu-repo/grantAgreement/EUR/IEF/PIEF-GA-2013-625064info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2014-59650-PSENSORS 16, 5 (2016), 658 [12 pp]byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess