Hafidh, Afifa Touati, Fathi Hosni, Faouzi Hamzaoui, Ahmed Hichem Somrani, Sayda New silica hybrids elaborated by sol-gel process from bifunctional thiadiazole and 1,2,4-triazole precursors <p>New hybrid materials were synthesized from an inorganic precursor, (tetraethoxysilane: TEOS) and bifunctional organic precursors through the sol-gel process. Indeed, monolithic and transparent hybrid gels were obtained by the reaction of tetraethoxysilicate (TEOS) with 1,2,4-thiadiazole-3,5-diamine <b>(1)</b>, 5-amino-1,3,4-thiadiazole-2-thiol <b>(2)</b>, and 1H-1,2,4-triazole-3-thiol <b>(3)</b> in ethanol as solvent, using chloric acid (HCl 10<sup>−1</sup>M) as catalyst. It is shown that TEOS has been cross-linked with bi-functional heterocyclic compounds: <b>(1), (2)</b> and <b>(3)</b> leading to the formation of transparent and colorous gels. The characterization was realized by infrared, <sup>29</sup>Si and <sup>13</sup>C CP MAS NMR. The xerogels morphology and texture were studied by scanning electron microscopy (SEM) and Brunauer – Emmet – Teller method (BET). The obtained results show that organic adducts <b>(1), (2)</b> and <b>(3)</b> react with TEOS leading to gels in which Si–N and Si–S bridges were formed. According to N<sub>2</sub>-physisorption results, xerogels are mesoporous with specific surface area varied from 105 to 312 m<sup>2</sup>g<sup>−1</sup> and their isotherms are classified as type IV. The optic and magnetic properties of hybrids were studied respectively by UV-Vis spectroscopy and RPE. This study showed that all materials are paramagnetic semiconductors.</p> Hybrid material;Sol-Gel process;1,2,4-thiadiazole;1,2,4-triazole;29Si and 13C CP MAS-NMR;UV-vis and RPE 2018-02-20
    https://tandf.figshare.com/articles/journal_contribution/New_Silica_Hybrids_Elaborated_by_Sol-Gel_process_from_Bifunctional_Thiadiazole_and_1_2_4-Triazole_PrecursorsNouveaux_Hybrides_base_de_Silicium_Elabor_s_par_le_Proc_d_Sol-Gel_partir_de_Pr_curseurs_Thiadiazoles_et_1_2_4-triazole_bifonctionnels/5521984
10.6084/m9.figshare.5521984.v3