A Luminescent MOF Based on Pyrimidine-4,6-dicarboxylate Ligand and Lead(II) with Unprecedented Topology
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Razquin-Bobillo, Laura; Vitorica-Yrezabal, Iñigo Javier; Moreno Sánchez, José María; Rodríguez Diéguez, AntonioEditorial
MDPI
Materia
Lead(II) Metal–organic framework Pyrimidine-4,6-dicarboxylate New topology Photoluminescence properties Time-dependent density-functional theory
Date
2023-10-13Referencia bibliográfica
Razquin-Bobillo, L.; Pajuelo-Corral, O.; Zabala-Lekuona, A.; Vitorica-Yrezabal, I.; García, J.A.; Moreno, J.M.; Rodríguez-Diéguez, A.; Cepeda, J. A Luminescent MOF Based on Pyrimidine-4,6- dicarboxylate Ligand and Lead(II) with Unprecedented Topology. Crystals 2023, 13, 1490. [https://doi.org/10.3390/cryst13101490]
Sponsorship
Secretaría de Estado de Investigación, Desarrollo e Innovación MCIN/ AEI/10.13039/501100011033, PGC2018-102052-A-C22, PGC2018-102052-B-C21 I+D+i; Euskal Herriko Unibertsitatea EHU; Junta de Andalucía FQM-394, ProyExcel_00386; SGIker of UPV/EHU; European funding (ERDF and ESF); UPV/EHUAbstract
In the present work, we report on a 3D MOF of {[Pb5(μ3-OH)(μ3-NO3)3(μ6-pmdc)3]·H2O}n formula (pmdc = pyrimidine-4,6-dicarboxylate) synthesized by an oven-heated, solvent-free procedure. The large connectivity afforded by the three ligands in their coordination to lead(II) ions grows cubic building units characterized by a central Pb atom with an unusual coordination index of 12 and 6 pmdc ligands occupying the faces. These cubic units are linked to one another giving rise to a quite condensed structure that represents an unprecedented topology showing the (4·62)6(43)2(45·610)3(45·68·82)6(46·69)6(612·83) point symbol. The crystalline material has been characterized by routine physico-chemical techniques to confirm its purity, and its thermal behaviour has been also studied by thermogravimetric and thermodiffractometric analyses. The solid presents a greenish blue photoluminescent emission based on pmdc ligands, as revealed by time-dependent density-functional theory (TDDFT) calculations, which is substantially more intense than in the free H2pmdc ligand according to its improved quantum yield. The emissive capacity of the material is further analysed according to decreasing temperature of the polycrystalline sample, finding that sizeable, long-lasting phosphorescence is present.