1261477-35-3Relevant articles and documents
Purely heterometallic lanthanide(III) macrocycles through controlled assembly of disulfide bonds for dual color emission
Lewis, David J.,Glover, Peter B.,Solomons, Melissa C.,Pikramenou, Zoe
, p. 1033 - 1043 (2011)
Lanthanide complexes based on bis(amides) of die thy lenetria minepentaace tic acid with thiol functionalities are modified with 2,2′-dipyridyl disulfide to give activated complexes that can selectively react with thiol-functionalized complexes to form heterometallic lanthanide macrocycles. The preparation and full characterization of the polyaminocarboxylate ligands N,N″-bis-[p-thiophenyl(aminocarbonyl)]diethylenetriamine-N, N′, N″-triacetic acid (H3LX) and the activated N, NPrime;-bis[p-(pyridyldithio)-[phenyl(aminocarbonyl)]]diethylenetriamine-N, N′, N″-triacetic acid (H3Ly) and the complexes LaLx, NdLx, SmLx, EuLx, GdL x, DyLx, TbLx, ErLx, and YbL x are reported. The luminescence properties of the LnLx complexes emitting in the visible (where Ln = Dy3+, Tb3+, Eu3+, and Sm3+) are examined by steady-state and time-resolved photoluminescence, and the triplet state energy level of GdL x was estimated to be 24 100 cm-1 from the 0-0 band of the 77 K phosphorescence spectrum. Near-infrared emission was detected for the NdLx, YbLx, and ErLx complexes, demonstrating the versatility of the thiophenol chromophore. The assembly of purely heterometallic EuTbLx2 macrocycles by reaction of EuL x with TbIy was followed by UV-vis absorption spectroscopy, monitoring the characteristic absorption peak of pyridyl-2-thione at 353 nm. Analysis of the solution by mass spectrometry reveals the formation of purely heterometallic macrocycle EuTbLx2. This is in contrast with the results obtained by dynamic self-assembly under oxidative conditions, where we observe a statistical mixture of macrocyclic complexes of Eu2Lx2, Tb2Lx 2, and EuTbLx2. The EuTbLx 2 macrocycle displays dual color emission, incorporating the characteristicf-ftransitions of Eu3+ and Tb3+. Investigation into the time-resolved photophysical properties of EuTbL x2 reveals energy transfer from Tb3+ to Eu 3+, facilitated by the different conformations of the macrocycle in solution.
