title: Water stable Zr-benzenedicarboxylate metal-organic frameworks as photocatalysts for hydrogen generation.
abstract: The Zr-containing metal-organic frameworks (MOFs) formed by terephthalate (UiO-66) and 2-aminoterephthalate ligands [UiO-66(NH(2))] are two notably water-resistant MOFs that exhibit photocatalytic activity for hydrogen generation in methanol or water/methanol upon irradiation at wavelength longer than 300 nm. The apparent quantum yield for H(2) generation using monochromatic light at 370 nm in water/methanol 3:1 was of 3.5% for UiO-66(NH(2)). Laser-flash photolysis has allowed detecting for UiO-66 and UiO-66(NH(2)) the photochemical generation of a long lived charge separated state whose decay is not complete 300 μs after the laser flash. Our finding and particularly the influence of the amino group producing a bathochromic shift in the optical spectrum without altering the photochemistry shows promises for the development of more efficient MOFs for water splitting.
authors.affiliation: Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 Valencia, Spain.
authors.forename: Cláudia
authors.initials: C
authors.lastname: Gomes Silva
authors.forename: Ignacio
authors.initials: I
authors.lastname: Luz
authors.forename: Francesc X
authors.initials: FX
authors.lastname: Llabrés i Xamena
authors.forename: Avelino
authors.initials: A
authors.lastname: Corma
authors.forename: Hermenegildo
authors.initials: H
authors.lastname: García