Deciphering the photobehaviour of ensemble and single crystals of Zr-based ITQ MOF composites

Synthesis, characterization & catalysis of ITQ 2D metal–organic frameworks and spectroscopic & photodynamic properties of their composites with organic dyes

“…The photodynamics of this material is rich and complex, with the emission decays fitted by a sum of 4 exponential components, giving time constants of τ 1 = 0.15 ns, τ 2 = 0.34 ns, τ 3 = 1.18 ns, and τ 4 = 3.31 ns. 126 The shortest τ 1 -component is the emission of NR molecules from their LE state, while the second τ 2 -component, which appears as a decay in the shorter wavelengths and as a rise in the longer ones, is related to the homo-ET process, similar to what was found for the NR@Al-ITQ-HB composite. However, this ET reaction is much slower (from 0.22 to 0.34 ns) because of the change in the polarity of the MOF material due to the replacement of the Al clusters by the Zr ones.…”

“…The ultrafast dynamics of NR@Zr-ITQ-HB is not very different from that described for NR@Al-ITQ-HB. 126 The analysis of the fsemission decays gives a sub-picosecond component of 0.6 ps, which is decaying at shorter wavelengths while rising at longer ones, and a second one of 10 ps, observed only at shorter wavelengths (Fig. 16b).…”

“…The effect of the metal cluster on the spectroscopic and photodynamic properties of the NR adsorbed on the M-ITQ-HB 2D-MOF was also evaluated. 126 To this end, the Al clusters were replaced by Zr ones, yielding the Zr-ITQ-HB 2D MOF. The absorption spectrum of the NR@Zr-ITQ-HB composite becomes broader than that of the NR@Al-ITQ-HB and presents a new shoulder at 650 nm, which is not observed for the Al-based MOF.…”

A Career in Catalysis: Avelino Corma

“…The peculiar and controllable hydrophobic−hydrophilic properties of these solids enable their use as containers of volatile organic compounds for agrochemical applications 284 and as photocatalysts after the incorporation of dye molecules. 285 8. SUPPORTED METAL CATALYSTS Supported metals are a prominent class of catalysts in the chemical industry.…”

“…In addition, these low-dimensional metalorganic structures were effective for one-pot two-step oxidation–acetalization reactions, which allow one to obtain novel heterogeneous multifunctional organic–inorganic materials when two or more active functions are present in the assembled 1D building units. The peculiar and controllable hydrophobic–hydrophilic properties of these solids enable their use as containers of volatile organic compounds for agrochemical applications and as photocatalysts after the incorporation of dye molecules …”