title: Intra-complex energy transfer of europium(III) complexes containing anthracene and phenanthrene moieties.
abstract: Laser excitation and luminescence studies were carried out for an ethanol solution of tris(hexafluoroacetylacetonato)europium(III), Eu(hfac)(3)(H(2)O)(2) (1), and n-hexane solutions of tris(hexafluoroacetylacetonato)europium(III) bis(9-diisopropylphosphorylanthracene), Eu(hfac)(3)(DiPAnO)(2) (2), and tris(hexafluoroacetylacetonato)europium(III) bis(2-diisopropylphosphorylphenanthrene), Eu(hfac)(3)(DiPPheO)(2) (3). The absorption spectra of 2 and 3 in n-hexane are interpreted by assuming that the central Eu(III) ion weakly interacts with the DiPAnO and DiPPheO moieties. The emission spectroscopic studies revealed that (1) Eu(hfac)(3)(DiPAnO)(2) emits only fluorescence from the DiPAnO moiety and (2) Eu(hfac)(3)(DiPPheO)(2) gives luminescence from the central Eu(III) ion, and (3) Eu(hfa)(3)(H(2)O)(2) and Eu(hfac)(3)(DiPPheO)(2) afford emission from both the (5)D(1) and (5)D(0) states of the Eu(III) ion upon 355 nm laser excitation. The intracomplex energy transfer processes are presented on the basis of absorption, emission and laser excitation studies.
authors.affiliation: RIKEN (The Institute of Physical & Chemical Research), Hirosawa 2-1, Wako-Shi 351-0198, Japan. osawa@postman.riken.jp
authors.forename: Masahisa
authors.initials: M
authors.lastname: Osawa
authors.forename: Mikio
authors.initials: M
authors.lastname: Hoshino
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Wada
authors.forename: Fumi
authors.initials: F
authors.lastname: Hayashi
authors.forename: Shuichi
authors.initials: S
authors.lastname: Osanai
mesh_terms: D000873:Anthracenes / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010616:Phenanthrenes / Q000737:chemistry*
chemical_list: D000873:Anthracenes; D049408:Luminescent Agents; D009942:Organometallic Compounds; D010616:Phenanthrenes; D005063:Europium; C031181:phenanthrene; C034020:anthracene