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J. Korean Ceram. Soc. > Volume 58(6); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(6): 728-736.
doi: https://doi.org/10.1007/s43207-021-00147-z
The photoluminescence properties of hybrid materials of metal (II)‑8‑hydroxyquinoline into mesoporous silica
Patcharaporn Pimchan, Pornpan Tana, Natchanok Jansawang
Department of Chemistry, Faculty of Science and Technology, Rajabhat Maha Sarakham University, Maha Sarakham 44000, Thailand
Correspondence  Patcharaporn Pimchan ,Email: patcharaporn.pi@rmu.ac.th
Received: July 16, 2021; Revised: September 17, 2021   Accepted: September 23, 2021.  Published online: November 30, 2021.
ABSTRACT
The hybrid materials (HBs) of metal (II)-8-hydroxyquinoline complexes, namely Coq2, Niq2 and Znq2 (Mq2), in the mesoporous silica were prepared, as well as their optical properties were investigated. The mesoporous silica (MCM) was synthesized by colloidal reaction of sodium silicate solution from the rice husk. After that the HBs was prepared by the solid–solid reactions between mesoporous silica, transition metals and 8-hydroxyquinoline. The incorporation of HBs were characterized by SEM, FT–IR, AAS, as well as PL. The photoluminescence maxima and intensities of the HBs varied depending on the spectro-chemical series and electron configuration as well as microstructure of metal complexes and mesoporous characteristics. The photoluminescence of the products increased in the order of Coq2@MCM < Znq2@MCM < Niq2@ MCM. The host mesoporous silica improves photoluminescence properties such that the PL intensities of Mq2 complexes into MCM were higher than those of the free complexes because mesoporous silica can reduce the luminescence quenching and enhance the complete metal-to-ligand charge transfer of metal complexes. Especially, the Niq2 and Znq2 in the mesoporous silica revealed the excellent photoluminescence property.
Key words: Hybrid materials · Luminescence · Mesoporous silica · Transition metal complexes · 8-Hydroxyquinoline
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