Site-selective Eu(iii) spectroscopy of highly efficient luminescent mixed-metal Pb(ii)/Eu(iii) coordination polymers. Issue 10 (18th January 2017)

• Record Type: Journal Article
• Authors: Barbosa, C. D. E. S.; da Luz, L. L.; Paz, F. A. Almeida; Malta, O. L.; Rodrigues, M. O.; Júnior, S. A.; Ferreira, R. A. S.; Carlos, L. D.
• Is Part Of: RSC advances. Volume 7:Issue 10(2017)
• Page Start: 6093
• Page End: 6101
• Publication Date: 2017-01-18
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra27850g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Novel coordination polymers based on Pb1− x Eu x –BDC ( x = 0.05–0.50, BDC = 1, 4-benzenedicarboxylic acid) are reported with a maximum emission quantum yield of 69 ± 7%. Abstract : Novel mixed-metal coordination polymers (CPs) based on Pb1− x Eu x –BDC ( x = 0.05, 0.10, 0.25, 0.50 and BDC = 1, 4-benzenedicarboxylic acid) are reported. The materials display different coordination structures as the Pb : Eu metal ratio is modified. Whereas for x < 0.25 the Eu 3+ ions essentially replace the Pb 2+ ones in the [Pb(BDC) n ] structure, for x > 0.25 the samples are isotypical with [Eu2 (BDC)3 (H2 O)4 ], as shown by powder (including Rietveld analysis) and single-crystal X-ray diffraction. The unique Pb0.75 Eu0.25 –BDC compound displays a mixture of both crystalline phases with the highest emission quantum yield value reported for luminescent CPs based on Pb(ii ), 69 ± 7%. Site-selective excitation using a common Xe lamp permits the detailed study of the two Eu 3+ local sites, illustrating how powerful the Eu 3+ luminescence is as a local probe spectroscopic tool.