title: Experimental and theoretical study of the photophysics and structures of europium cryptates incorporating 3,3'-bi-isoquinoline-2,2'-dioxide.
abstract: A detailed photophysical study of [Eu within (biqO2.2.2)(CF3SO3)](CF3SO3)2. CH3CN.H2O (Eu within 1) and two other types of cryptates incorporating three 3,3'-biisoquinoline-2,2'-dioxide units has been performed. Structural crystallographic data of Eu within 1, electronic structure calculations and theoretical models were used to obtain the intramolecular energy transfer rates and the appropriate set of rate equations, which was solved numerically. Quantum yields and decay lifetimes were obtained from these results and compared to the experimental data. The role of the ligand-to-metal charge transfer (LMCT) states was ascertained. A theoretical ligand field and intensity analysis was carried out and the results agree very well with the emission spectra. The molecular structures of the lanthanide cryptates were successfully modelled by the YIII ion using the restricted Hartree-Fock (RHF) method, with the advantage of dealing with closed-shell systems. These molecular structures were used to explain the drastic differences in the photophysics of the three EuIII cryptates.
authors.affiliation: Departamento de Química Fundamental, CCEN, Universidade Federal de Pernambuco, Cidade Universitária 50.740-540 Recife, PE, Brazil.
authors.forename: Paula
authors.initials: P
authors.lastname: Gawryszewska
authors.forename: Oscar L
authors.initials: OL
authors.lastname: Malta
authors.forename: Ricardo L
authors.initials: RL
authors.lastname: Longo
authors.forename: Fabiana R
authors.initials: FR
authors.lastname: Goncalves e Silva
authors.forename: Severino
authors.initials: S
authors.lastname: Alves
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Mierzwicki
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Latajka
authors.forename: Marek
authors.initials: M
authors.lastname: Pietraszkiewicz
authors.forename: Janina
authors.initials: J
authors.lastname: Legendziewicz