Luminescence investigation of the Sm(III)-b-diketonates with sulfoxides, phosphine oxides and amides ligands.

Submitted by Karine Ribeiro (karinelg.ribeiro@gmail.com) on 2015-03-31T18:23:37Z No. of bitstreams: 1 ARTIGO_LuminescenceInvestigationSm.pdf: 210797 bytes, checksum: 24313ec5e310236261024d829c9479cb (MD5)Approved for entry into archive by Oliveira Flávia (flavia@sisbin.ufop.br) on 2015-03-31T20:02:20Z (GMT) No. of bitstreams: 1 ARTIGO_LuminescenceInvestigationSm.pdf: 210797 bytes, checksum: 24313ec5e310236261024d829c9479cb (MD5)Made available in DSpace on 2015-04-01T17:16:04Z (GMT). No. of bitstreams: 1 ARTIGO_LuminescenceInvestigationSm.pdf: 210797 bytes, checksum: 24313ec5e310236261024d829c9479cb (MD5) Previous issue date: 2002In this paper we report on a photoluminescent investigation of complexes involving Sm -b-diketonates with sulfoxides, phosphine oxides and amides ligands. In the synthesis of the coordination compounds we used samarium tris(thenoyltrifluoroacetonate) dehydrated precursor with the following ligands (L): DBSO and PTSO sulfoxides; TPPO phosphine oxide and (PHA) N-phenylacetamide. They have 31 31 shown high orange luminescence characteristic of the Sm ion. The emission spectra of the Sm -complexes present narrow bands 4 6 4 6 arising from the G →H (J55/ 2, 7/ 2, 9/ 2, 11/2) transitions with the hypersensitive G →H transition as a prominent group. It 5 / 2 J 5 / 2 9/ 2 4 31 is observed an efficient intramolecular energy transfer from the triplet state (T) of the ligands to the emitting G state of the Sm ion. 5 / 2 The experimental intensity parameters (h andh ) for the Sm and Eu complexes have been determined and compared. The lifetimes (t ) Sm Eu 4 of the emitting level G of the Sm-complexes are approximately 10 times higher than in the precursor compound [Sm(TTA) ?(H O) ] 5 / 2 3 2 2 indicating that radiative processes are operative in all the compounds due to the absence of multiphonon relaxation by coupling with the OH oscillators