title: Tuning of the sensing properties of luminescent Eu(3+) complexes towards the nitrate anion.
abstract: A new family of imine-based ligands containing pyridine or furan as an aromatic donating ring [N,N'-bis(2-pyridylmethylidene)-1,2-(R,R + S,S)-cyclohexanediamine, L1; N,N'-bis(2-furanylmethylidene)-1,2-(R,R + S,S)-cyclohexanediamine, L2 and N,N'-bis(2-thienylmethylidene)-1,2-(R,S)-cyclohexanediamine, L3] has been prepared in high yield by means of an easy synthetic protocol. Their trifluoromethansulphonate (CF3SO3(-), OTf(-)) Eu(iii) complexes have been employed for luminescence sensing of the NO3(-) anion in an anhydrous acetonitrile solution. Spectrophotometric titrations have been carried out to define the speciation in the solution and study the formation of ternary species occurring with the addition of NO3(-) anions. The sensing response towards this anion is strongly dependent on the nature of the ligand, the stoichiometry of the complexes and their concentration.
authors.affiliation: Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy. fabio.piccinelli@univr.it.
authors.forename: Fabio
authors.initials: F
authors.lastname: Piccinelli
authors.affiliation: Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy. fabio.piccinelli@univr.it.
authors.forename: Marco
authors.initials: M
authors.lastname: Leonzio
authors.affiliation: Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy. fabio.piccinelli@univr.it.
authors.forename: Marco
authors.initials: M
authors.lastname: Bettinelli
authors.affiliation: Dipartimento di Chimica "G. Ciamician", Università di Bologna, Via Selmi 2, 40126 Bologna, Italy.
authors.forename: Magda
authors.initials: M
authors.lastname: Monari
authors.affiliation: Dipartimento di Chimica, Fisica e Ambiente, Università di Udine, via Cotonificio 108, 33100 Udine, Italy. andrea.melchior@uniud.it.
authors.forename: Cristian
authors.initials: C
authors.lastname: Grazioli
authors.affiliation: Dipartimento di Chimica, Fisica e Ambiente, Università di Udine, via Cotonificio 108, 33100 Udine, Italy. andrea.melchior@uniud.it.
authors.forename: Andrea
authors.initials: A
authors.lastname: Melchior
authors.affiliation: Dipartimento di Chimica, Fisica e Ambiente, Università di Udine, via Cotonificio 108, 33100 Udine, Italy. andrea.melchior@uniud.it.
authors.forename: Marilena
authors.initials: M
authors.lastname: Tolazzi