Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 7, Pages 5112-5120Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp04436g
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Funding
- MINECO [MAT2011-25472, MAT2014-52085-C2-2-P]
- Consolider Ingenio (MULTICAT) [CSD2009-0050]
- JCCM through the project [PRI-PIBIN-2011-1283]
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We report on the spectra and dynamics of a Zr-naphthalene dicarboxylic acid (Zr-NDC) MOF in different diluted solvent suspensions and in a concentrated tetrahydrofuran (THF) one. In a diluted diethyl ether (DE) suspension, we observed intraparticle excimer formation between neighboring naphthalene organic linkers, leading to a red-shifted broad band in the emission spectrum and to a dynamics composed of three components tau(1) = 650 ps, tau(2) = 3.7 ns and tau(3) = 13.9 ns, assigned to the excimer photoproduction, monomer and excimer lifetimes, respectively. Furthermore, both absorption and emission spectra show a blue shift in more polar solvents characterized by the solvent polarity function f (epsilon,n). We also observed changes in the excimer formation time (490-840 ps) probably due to a variation in the MOF structural fluctuation induced by solvent filling. The global fluorescence quantum yield of these suspensions is around 0.30 +/- 0.05. At higher concentrations of the MOF particles, we observed the absorption and emission signals of aggregates having an intercrystal excimer formation in similar to 5 ps in a THF suspension, similar to 100 times shorter than that observed in a diluted one. Our results give the spectral and dynamical properties of a Zr-NDC MOF in solvent suspensions, opening the way to further studies of these kinds of MOFs interacting with fluorescent dyes for possible photonic applications.
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