title: Smart Grafting of Lanthanides onto Silica via N,N-Dialkylcarbamato Complexes.
abstract: The grafting and the postgrafting functionalization of lanthanide ions on commercial amorphous silica have been herein carried out by using as a precursor the terbium N,N-dibutylcarbamato derivative [Tb(O2CNBu2)3]. The reaction of the complex with the surface silanols involved only a fraction of the carbamato ligands. The following protolytic substitution of the residual carbamato ligands was carried out by exploiting the Brønsted's acidity of the β-diketone dibenzoylmethane (Hdbm), in view of the antenna effect of the β-diketonato groups, which are commonly used in lanthanide photoluminescence studies. The reaction proceeded at room temperature in a clean and easy way affording the introduction of the chosen functionality in the lanthanide coordination sphere. The same procedure has been followed by using as a precursor the X-ray characterized heterometallic N,N-dibutylcarbamato complex [NH2Bu2]2[Ln4(CO3)(O2CNBu2)12] (Ln = Eu, Tb, Tm). In both cases, X-ray photoelectron spectroscopy evidenced the chemical implantation of the lanthanide ions on the silica surface, and photoluminescence studies pointed out the potentiality of the proposed synthetic approach in the preparation of highly luminescent materials.
authors.affiliation: CNR IENI and INSTM, Dipartimento di Scienze Chimiche, Università di Padova , via Marzolo 1, I-35131, Padova, Italy.
authors.forename: Lidia
authors.initials: L
authors.lastname: Armelao
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Giuseppe Moruzzi 13, I-56124, Pisa, Italy.
authors.forename: Daniela
authors.initials: D
authors.lastname: Belli Dell'Amico
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Giuseppe Moruzzi 13, I-56124, Pisa, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Bellucci
authors.affiliation: CNR IENI and INSTM, Dipartimento di Scienze Chimiche, Università di Padova , via Marzolo 1, I-35131, Padova, Italy.
authors.forename: Gregorio
authors.initials: G
authors.lastname: Bottaro
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Giuseppe Moruzzi 13, I-56124, Pisa, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Labella
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Giuseppe Moruzzi 13, I-56124, Pisa, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Marchetti
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Giuseppe Moruzzi 13, I-56124, Pisa, Italy.
authors.forename: Simona
authors.initials: S
authors.lastname: Samaritani