A new Tb3+-diketonate complex and its inclusion in a K2SO4 crystal matrix: Luminescent hourglass

Serra, Osvaldo Antônio; Rosa, Ieda L. V.; Nassar, Eduardo J.; Calefi, Paulo S.; Cardoso, Paulo César

doi:10.1016/s0925-8388(96)02530-3

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…Serra and co-workers have prepared highly luminescent lanthanide hourglasses of terbium and europium complexes within K 2 SO 4 . [392][393][394] However, the 247 Crystal dyeing was also explored as a means of preparing photorefractive materials. Gu ¨nter and coworkers doped 2-cyclooctylamino-5-nitropyridine with tetracyanoquinodimethane; however, the specificity of the growth process could not be judged in crystals grown from the melt.…”

Section: Photonicsmentioning

confidence: 99%

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Dyeing Crystals

2001

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Section: Photonicsmentioning

confidence: 99%

“…Serra and co-workers have prepared highly luminescent lanthanide hourglasses of terbium and europium complexes within K 2 SO 4 . − However, theligand sphere of the guest ions and their relationship to the host crystals were not defined.…”

Section: Photonicsmentioning

confidence: 99%

Dyeing Crystals

2001

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“…Solubilization of these chelates in water can be achieved by their encapsulation into macrocyclic compounds, which isolates the coordination site from the solvent molecules, thus avoiding non-radiative losses to the medium. 9,10 In this work we describe how the inclusion of terbium(III) β-diketonate chelates into the hydrophobic cavity of α-cyclodextrin enhances the solubility of the complexes in aqueous medium and leads to changes in their photophysical properties. Cyclodextrins (CD) are an important class of cyclic oligosaccharides consisting of six (α-CD), seven (β-CD), or eight ( -CD) D-(+)glucopyranose units linked through α-1,4 glycosidic bonds.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic study of Tb3+(beta-diketonate)3: alpha-cyclodextrin inclusion compounds in aqueous solution

Ribeiro

Serra

2007

J. Braz. Chem. Soc.

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Neste trabalho descrevemos a síntese de β-dicetonatos de Tb 3+ e o aumento de sua solubilidade em água através da formação de compostos de inclusão em α-ciclodextrina (α-CD). Os complexos [Tb(ppa) 3 (H 2 O) 2 ] e [Tb(ppa) 3 (phen)] (ppa=3-fenil-2,4-pentanodiona; phen = fenantrolina) foram sintetizados, caracterizados e a seguir incluídos em α-ciclodextrina. A inclusão foi confirmada por 1 H NMR e a estequiometria de associação determinada pelo método de Job. Nos espectros de excitação, os comprimentos de onda dos máximos de intensidade dos compostos de inclusão em solução aquosa [Tb(ppa) 3 (H 2 O) 2 ]:α-CD e [Tb(ppa) 3 (phen)]:α-CD apresentaram-se deslocados em 15 e 60 nm, respectivamente, com relação aos comprimentos de onda dos máximos dos complexos não incluídos. Nos espectros de emissão, as bandas características do Tb 3+ foram observadas mesmo após a inclusão dos compostos em α-CD. In this work we describe how the inclusion of Tb 3+ β-diketonate chelates into the hydrophobic cavity of α-cyclodextrin enhances the solubility of the complexes in aqueous medium and leads to changes in their photophysical properties. To this end, the complexes [Tb(ppa) 3 (H 2 O) 2 ] and [Tb(ppa) 3 (phen)] (ppa=3-phenyl-2,4-pentanedione; phen = phenantroline) were synthesized and characterized, and they were then included into α-cyclodextrin pockets. This inclusion was confirmed by 1 H NMR spectroscopy and the stoichiometry was determined by means of the Job method. In the excitation spectra, the maximum intensity wavelength of the inclusion compounds [Tb(ppa) 3 (H 2 O) 2 ]: α-CD and [Tb(ppa) 3 (phen)]:α-CD were displaced 15 and 60 nm respectively when compared with the non-CD starting complexes. The typical Tb 3+ emission bands were maintained after inclusion of the complexes into α-CD and their subsequent solubilization in aqueous medium.

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“…However, they are forbidden transitions, so the rare earth ions absorb very little of the excitation energy. On the other hand, rare earth organic complexes exhibit intense narrow emission band via an effective intramolecular energy transfer from the ligand to the metal ion, under excitation by near ultraviolet light, which is called the antenna effect [2,3]. The ␤-diketones have been shown as excellent organic molecules to transfer energy for rare earth ions [4,5].…”

Section: Introductionmentioning

confidence: 99%