Mikhalyova E, Khomenko OV, Gavrilenko KS, Dotsenko VP, Addison AW, Pavlishchuk VV. Absorption- and Excitation-Modulated Luminescence of Pr
3+, Nd
3+, and Lu
3+ Compounds with Dianions of Tetrafluoroterephthalic and Camphoric Acids.
ACS OMEGA 2019;
4:2669-2675. [PMID:
31459502 PMCID:
PMC6648583 DOI:
10.1021/acsomega.8b02388]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 01/10/2019] [Indexed: 06/10/2023]
Abstract
The luminescence of coordination polymers of Pr3+, Nd3+, and Lu3+ with tetrafluoroterephthalate and camphorate, [Ln2(Fbdc)3(DMF)2(H2O)]2 (Ln = Pr, Nd, Lu) and [Ln2(Camph)2(NO3)2(MeOH)]4 (Ln = Pr, Nd, Lu), was studied. Ligand-centered and/or metal-centered emissions appear, which depend on the excitation wavelength, ultimately allowing the emitted light color to be adjusted. Low-efficiency ligand-to-metal energy transfer leads to a difference between the excitation spectra of the tetrafluoroterephthalate- and camphorate-Pr3+ compounds, arising from a primary filtering effect on the ligand-centered excitation, by Pr3+ absorption. A secondary inner filter effect significantly changes the shape of the luminescence band, allowing a wide variation in the emission color, producing, for instance, a purple color, which is not the normal spectral emission. The low-efficiency energy transfer renders tetrafluoroterephthalate and camphorate ineffective as traditional "antenna" ligands for Pr3+ and Nd3+.
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