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Structure and NIR-luminescence of ytterbium(III) Beta-Diketonate Complexes With 5-nitro-1,10-phenanthroline Ancillary Ligand: Assessment of Chain Length and Fluorination Impact

Structure and NIR-luminescence of ytterbium(III) Beta-Diketonate Complexes With 5-nitro-1,10-phenanthroline Ancillary Ligand: Assessment of Chain Length and Fluorination Impact

Pablo Martín-Ramos, Pedro S Pereira da Silva, Victor Lavín, Inocencio R Martín, Fernando Lahoz, Pedro Chamorro-Posada, Manuela Ramos Silva, Jesús Martín-Gil

Dalton Trans. 2013 Oct 7;42(37):13516-26.

PMID: 23900403

Abstract:

Seven new tris(β-diketonear-nate)ytterbium(III) complexes with the general formula [Yb(β-diketonate)3(5NO2phen)] (where the β-diketone is either 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione, 4,4,4-trifluoro-1-(2-furyl)-1,3-butanedione, 1,1,1-trifluoro-2,4-pentanedione, 1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedione, 1,1,1,5,5,6,6,7,7,7-decafluoro-2,4-heptanedione, 2,4-hexanedione or 2,6-dimethyl-3,5-heptanedione, and 5NO2phen = 5-nitro-1,10-phenanthroline) were synthesized and characterized by elemental analysis, attenuated total reflectance Fourier transform infrared spectroscopy and photoluminescence spectroscopy. Single crystal X-ray structures have been determined for three fluorinated complexes and ground state geometries of the other four complexes have been predicted using the Sparkle/PM6 model. These experimental structures and those designed by semi-empirical models reveal octacoordination around the Yb(3+) ion. Photoluminescence studies and lifetime measurements show that the increase in the fluorinated β-diketonate chain length is associated with a decrease in Yb(3+) luminescence intensity of the (2)F5/2→(2)F7/2 transition at around 980 nm and the (2)F5/2 excited state lifetime, while the ligand lifetime value remains almost unaffected. Finally, fluorination of the ligands is only advised when the complexes are to be used for co-doping with isostructural Er(3+) complexes for optical amplifiers, since it leads to a slight decrease in luminescence intensity for the same β-diketonate chain length.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP4199886	5-Nitro-1,10-phenanthroline		4199-88-6	Price
AP893334	4,4,4-Trifluoro-1-(2-naphthyl)-1,3-butanedione		893-33-4	Price

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