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Publication Type
Journal Article
UWI Author(s)
Author, Analytic
Gajadhar-Plummer, Alison S.; Kahwa, Ishenkumba A.; White, Andrew J.; Williams, David J.
Author Affiliation, Ana.
Department of Chemistry
Article Title
One-pot synthesis, structure, and unusual luminescence of novel one-dimensional lanthanide(III) tetramethoxyborates
Medium Designator
n/a
Connective Phrase
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Journal Title
Inorganic Chemistry
Translated Title
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Reprint Status
Refereed
Date of Publication
1999
Volume ID
38
Issue ID
8
Page(s)
1745-53
Language
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Connective Phrase
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Location/URL
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ISSN
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Notes
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Abstract
Detailed studies of formation, structure, and luminescence characteristics of novel ionically linked sinusoidal chains of [{Na} {(sal)3Ln(B(OCH3)4Ln(sal)3}]n [Ln = Nd, Sm, Tb-Lu, Y (4); Ln = Eu (5); Ln = Gd (6) was undertaken to assess the versatility of tetramethoxyborate anions as consistent general synthons for one-dimensional materials. Crystal data for [{Na}{(sal)3Nd(B(OCH3)4Nd(sal)3}]n [4(Ln = Nd)]: monoclinic; space group, C2/c (15), a = 20.884(2) , b = 12.454(1) , c = 37.663(5) , b = 102.09(2), Z = 8; [{Na}{(sal)3Eu(B(O CH3)4)- Eu(sal)3}]n (5): monoclinic; space group, C2/c (15), a = 20.846(2) , b = 12.460(1) , c = 37.365(4) , b = 102.17(1), Z = 8. Europium luminescence from [{Na}{(sal)3Ln1-xEux(B(OCH3)4)Ln1-xEux(sal)3}]n [Ln = Eu (5); Gd (7-11), Y (12), Dy (13-18), Dy/Gd (19) reveals the presence of defect Eu3+ sites, possibly resulting from swapping regular Eu3+ and Na+ positions. Strong Eu3+ -Eu3+ electronic interactions result in multidimensional energy migration and a dynamic excitation energy-transport regime. Efficient thermally activated regular Eu3+- to-defect Eu3+ back-energy transfer dominates at 297 K.....
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Keywords