abstract
The synthesis of pyrene-1,3,6,8-tetrayltetrakis(phosphonic acid) (H(8)ptp) and its use in the preparation of a new isotypical family of Metal-Organic Frameworks (MOF) using oxalic acid as secondary linker are reported. This new family, generally formulated as [Ln(2)(H(4)ptp)(ox)(H2O)(6)]center dot 5H(2)O [where Ln(3+)= Ce3+(1Ce), Pr3+(1Pr), Nd3+(1Nd), Sm3+(1Sm), Eu3+(1Eu), Gd3+(1Gd), Tb3+(1Tb) and Dy3+(1Dy)], were prepared under hydrothermal conditions and fully characterized using different techniques. The photoluminescence properties of1Euwere studied, showing emission lifetimes of 0.27 +/- 0.01 ms and 0.33 +/- 0.01 ms at 294 K and 12 K, respectively. This family of materials, based on a fully hydrolysed tetraphosphonate pyrene ligand, constitutes the first example of MOFs obtained using this highly fluorescent organic ligand.
keywords
MOFS
subject category
Chemistry
authors
Firmino, ADG; Mendes, RF; Ananias, D; Figueira, F; Tome, JPC; Rocha, J; Paz, FAA
our authors
Ana Daniela Gonçalves Firmino
Researcher
Duarte Ananias
Assistant Researcher
Filipe Alexandre Almeida Paz
Principal Researcher
Flávio Alberto da Silva Figueira
Junior Researcher
Ricardo Faria Mendes
Junior Researcheracknowledgements
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES. Thanks are also due to the University of Aveiro and FCT/MCT for the financial support for the QOPNA research Unit (FCT UID/QUI/00062/2019) and CQE (UIDB/00100/2020) research units through national funds and, where applicable, co-financed by the FEDER, within the PT2020 Partnership Agreement. FCT is also gratefully acknowledged for the Ph.D. grant SFRH/BD/84495/2012 (to ADF), and the Junior Research Position CEECIND/00553/2017 (to RFM) the PhD grant. The research contract of FF (REF-168-89-ARH/2018) is funded by national funds (OE), through FCT, in the scope of the framework contract foreseen in Nos. 4, 5 and 6 of article 23 of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19.