Polymorphism and luminescence properties of heteropolynuclear metal-organic frameworks containing oxydiacetate as linker

Author(s)

Igoa, Fernando ^[1] ; Martinez, Sebastian ^[1] ; Zanoni, Kassio P. S. ^[2] ; Castiglioni, Jorge ^[3] ; Suescun, Leopoldo ^[4] ; Gonzalez-Platas, Javier ^[5] ; de Camargo, Andrea S. S. ^[2] ; Kremer, Carlos ^[1] ; Torres, Julia ^[1]

Affiliation

^[1] Univ Republica, Fac Quim, Dept Estrella Campos, Area Quim Inorgan, Montevideo - Uruguay

^[2] Univ Sao Paulo, Sao Carlos Inst Phys IFSC, Sao Carlos, SP - Brazil

^[3] Univ Republica, Fac Quim, DETEMA, LAFIDESU, Montevideo - Uruguay

^[4] Univ Republica, Fac Quim, DETEMA, Cryssmat Lab, Montevideo - Uruguay

^[5] Univ La Laguna, Inst Univ Estudios Avanzados Fis Atom Mol & Foton, Dept Fis, Tenerife - Spain

• Document type: Journal article
• Source: CrystEngComm; v. 20, n. 34, p. 4942-4953, SEP 14 2018.
• Web of Science Citations: 1

Abstract

Using the flexible ligand oxydiacetic acid (H(2)oda), ten new heteropolynuclear compounds with general formula {[}Ln(2)Zn(3)(oda)(6)]xH(2)O (Ln = lanthanide ion, oda = oxydiacetate) were synthesized and structurally characterized. They were prepared by the direct reaction of oda in aqueous solution with stoichiometric amounts of Zn and Ln salts, followed by slow organic solvent diffusion. Two different structures were obtained: the larger lanthanides Pr, Nd, Eu and Tb gave compounds belonging to the hexagonal system, space group P6/mcc; whereas, the smaller ones, Ho, Er, Yb and Y formed cubic systems, space group Fd3c. In the case of Dy, the two polymorphs were obtained by slight variations in the synthetic conditions. The phase change observed is discussed in comparison with previously reported {[}Ln(2)M(3)(oda)(6)]xH(2)O compounds (M = bivalent metal ion). Luminescence studies were also carried out. Compounds containing Eu and Tb showed the most intense luminescence, also bearing relatively long lifetimes for the excited state deactivation. The luminescence profiles of both Dy systems are independent of the hexagonal or cubic arrangements, due to the similar environment of the Ln having the same point symmetry. (AU)

• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 16/07706-4 - Nanocrystalline luminescent materials: new chemical concepts for energy conversion and sustainability
• Grantee: Kassio Papi da Silva Zanoni
• Support type: Scholarships in Brazil - Post-Doctorate