One-Pot Synthesis, Structure, and Unusual Luminescence of Novel One-Dimensional Lanthanide(III) Tetramethoxyborates.
Detailed studies of formation, structure, and luminescence characteristics of novel ionically linked sinusoidal chains of [{Na}{(sal)(3)Ln(B(OCH(3))(4))Ln(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)(3)Nd(B(OCH(3))(4))Nd(sal)(3)}](n)() [4(Ln = Nd)]: monoclinic; space group, C2/c (15), a = 20.884(2) Å, b = 12.454(1) Å, c = 37.663(5) Å, beta = 102.09(2) degrees, Z = 8; [{Na}{(sal)(3)Eu(B(O CH(3))(4))Eu(sal)(3)}](n)() (5): monoclinic; space group, C2/c (15), a = 20.846(2) Å, b = 12.460(1) Å, c = 37.365(4) Å, beta = 102.17(1) degrees, Z = 8. Europium luminescence from [{Na}{(sal)(3)Ln(1)(-)(x)()Eu(x)()(B(OCH(3))(4))Ln(1)(-)(x)()Eu(x)()(sal)(3)}](n)() [Ln = Eu (5); Gd (7-11), Y (12), Dy (13-18), Dy/Gd (19)] reveals the presence of defect Eu(3+) sites, possibly resulting from swapping regular Eu(3+) and Na(+) positions. Strong Eu(3+)-Eu(3+) electronic interactions result in multidimensional energy migration and a dynamic excitation energy-transport regime. Efficient thermally activated regular Eu(3+)-to-defect Eu(3+) back-energy transfer dominates at 297 K.
Gajadhar-Plummer
Alison S.
AS
Chemistry Department, University of the West Indies, Mona Campus, Kingston 7, Jamaica, and Chemistry Department, Imperial College of Science, Technology and Medicine, South Kensington, London SW7 2AY, United Kingdom.
Kahwa
Ishenkumba A.
IA
White
Andrew J. P.
AJ
Williams
David J.
DJ