Chemical sensors based on a Eu(iii)-centered periodic mesoporous organosilica hybrid material using picolinic acid as an efficient secondary ligand. Issue 32 (21st July 2021)

• Record Type: Journal Article
• Authors: Liu, Wanlu; Kaczmarek, Anna M.; Rijckaert, Hannes; Van Der Voort, Pascal; Van Deun, Rik
• Is Part Of: Dalton transactions. Volume 50:Issue 32(2021)
• Page Start: 11061
• Page End: 11070
• Publication Date: 2021-07-21
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt01767e
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Eu(iii )-Centered periodic mesoporous organosilicas with picolinic acid as the 'antenna effect' ligand have been utilized for metal ion sensing (Fe 3+, Co2 + and Cu 2+ ) as well as pH sensing in alkaline environments. Abstract : Through a series of post synthetic modification methods applied to the 100% trans ethenylene-bridged Periodic Mesoporous Organosilica (ePMO), the lanthanide-functionalized hybrid nanomaterial ePMO@Eu_PA (PA = picolinic acid) has been prepared. The pristine and lanthanide-grafted ePMO materials were characterized by powder X-ray diffraction, DRIFTs, TGA, N2 sorption, SEM and TEM. The selected PA ligand could effectively sensitize the Eu 3+ ion, leading to the characteristic luminescence of Eu 3+ in ePMO@Eu_PA. The luminescence properties of the ePMO@Eu_PA were studied in detail in the solid state and after dispersing in water. The material was investigated for the use as ion sensor and showed a selective monitoring of Fe 3+, Co2 + and Cu 2+ ions with luminescence quenching. In addition, the material showed a linear relationship between the luminescence intensity and the pH value in the pH range from 7.7 to 10.2. These findings demonstrate that ePMO@Eu_PA possesses potential practical applications in ion sensing as well as in pH sensing.