A new acridine-based fluorescent chemosensor, L2, featuring two sulfurated macrocyclic units has been synthesised. Proton and metal binding properties of L2 have been studied in H2O/CH3CN (1:1 v/v) by potentiometric and spectrophotometric measurements and compared with those of the analogous and previously published bis-macrocyclic receptor featuring two [9]aneN3 units (L1). Despite a thermodynamic selectivity observed for Zn2+ with both L1 and L2, L2 shows a marked sensing selectivity towards Cd2+ via a chelation enhancement of fluorescence (CHEF) effect both in H2O/CH3CN (1:1 v/v) and in H2O using silica core-PEG shell nanoparticles as vehiculant. On the other hand, L1 shows a selective optical sensing towards Zn2+ in agreement with the thermodynamic selectivity observed for the same metal ion
Zn2+/Cd2+ optical discrimination by fluorescent acridine-based bis-macrocylic receptors / Aragoni, Maria Carla; Arca, Massimiliano; Bencini, Andrea; Caltagirone, Claudia; Conti, Luca; Garau, Alessandra; Valtancoli, Barbara; Isaia, Francesco; Lippolis, Vito; Palomba, Francesco; Prodi, Luca; Zaccheroni, Nelsi. - In: SUPRAMOLECULAR CHEMISTRY. - ISSN 1061-0278. - STAMPA. - 29:(2017), pp. 912-921. [10.1080/10610278.2017.1387262]
Zn2+/Cd2+ optical discrimination by fluorescent acridine-based bis-macrocylic receptors
BENCINI, ANDREA
;CONTI, LUCA;VALTANCOLI, BARBARA;
2017
Abstract
A new acridine-based fluorescent chemosensor, L2, featuring two sulfurated macrocyclic units has been synthesised. Proton and metal binding properties of L2 have been studied in H2O/CH3CN (1:1 v/v) by potentiometric and spectrophotometric measurements and compared with those of the analogous and previously published bis-macrocyclic receptor featuring two [9]aneN3 units (L1). Despite a thermodynamic selectivity observed for Zn2+ with both L1 and L2, L2 shows a marked sensing selectivity towards Cd2+ via a chelation enhancement of fluorescence (CHEF) effect both in H2O/CH3CN (1:1 v/v) and in H2O using silica core-PEG shell nanoparticles as vehiculant. On the other hand, L1 shows a selective optical sensing towards Zn2+ in agreement with the thermodynamic selectivity observed for the same metal ionFile | Dimensione | Formato | |
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