Design and synthesis of a new coumarin-based 'turn-on' fluorescent probe selective for 'Cu POT. 2+' - García-Beltrán, Olimpo; Mena, Natalia; Friedrich, Leidi Cecilia; Netto-Ferreira, José Carlos; Vargas, Victor; Quina, Frank Herbert; Núñez, Marco T; Cassels, Bruce K (Tetrahedron Letters, 2012)