title: Synthesis and photophysical characterization of highly luminescent silica films doped with substituted 2-hydroxyphthalamide (IAM) terbium complexes.
abstract: Innovative Tb(3+) antenna complexes employing two different substituted 2-hydroxyphthalamide ligands (HxOH-IAM and bis-HxOH-IAM) acting simultaneously as coordinating sites and light collector units have been synthesized and successively anchored in silica layers by the sol-gel technique. The complexes show remarkable photoluminescence (PL) quantum yields in methanol solution, as high as 0.30 and 0.40 for (HxOH-IAM)(4)⊂Tb(3+) and (bis-HxOH-IAM)(2)⊂Tb(3+), respectively. The grafting of the Tb(3+) complexes in silica single layers accomplished by exploiting the terminal hydroxyl groups of the IAM chains results in highly transparent and homogeneous films displaying bright green emission and PL efficiencies of up to 0.40. The silica layers containing the (bis-HxOH-IAM)(2)⊂Tb(3+) show remarkable photostability even under prolonged and continuous irradiation (up to 3.5 h). The nature of the IAM ligands allows the photoexcitation of the complexes at wavelengths even longer than 350 nm, which is a spectral window suitable to develop luminescent lanthanide probes dedicated to bioanalyses and bioimaging applications.
authors.affiliation: Istituto di Scienze e Tecnologie Molecolari (ISTM), Consiglio Nazionale delle Ricerche (CNR) e Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM) - Dipartimento di Scienze Chimiche - Università di Padova - Via F. Marzolo, 1 - 35131, Padova, Italy. lidia.armelao@unipd.it
authors.forename: Lidia
authors.initials: L
authors.lastname: Armelao
authors.forename: Gregorio
authors.initials: G
authors.lastname: Bottaro
authors.forename: Silvio
authors.initials: S
authors.lastname: Quici
authors.forename: Marco
authors.initials: M
authors.lastname: Cavazzini
authors.forename: Chiara
authors.initials: C
authors.lastname: Scalera
authors.forename: Gianluca
authors.initials: G
authors.lastname: Accorsi
mesh_terms: D008024:Ligands; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry; D010795:Phthalic Acids / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013725:Terbium / Q000737:chemistry*; D013818:Thermogravimetry; D014466:Ultraviolet Rays
chemical_list: D008024:Ligands; D049408:Luminescent Agents; D009942:Organometallic Compounds; D010795:Phthalic Acids; D013725:Terbium; D012822:Silicon Dioxide