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All Journal VALENSI EduChemia: Jurnal Kimia dan Pendidikan
Yulyani Nur Azizah
Department Of Chemistry, Science And Technology Faculty, Syarif Hidayatullah Islamic State University, South Tangerang, 15412, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology

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Journal : EduChemia: Jurnal Kimia dan Pendidikan

 1 
Synthesis, Characterization and Antioxidant Activity of Kobalt (II)-Hydrazone Complex Yulyani Nur Azizah; Irma Mulyani; Deana Wahyuningrum; Damar Nurwahyu Bima
EduChemia (Jurnal Kimia dan Pendidikan) Vol 5, No 2 (2020)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (623.189 KB) | DOI: 10.30870/educhemia.v5i2.7987

Abstract

The potency of the first-row transition metal complexes with Schiff's base ligand as an antioxidant has been widely studied by researchers. In this study, hydrazone-type Schiff base compounds, salicylaldehyde-2,4-dinitrophenylhydrazone (SDPH), resulted from the condensation of salicylaldehyde (1.5 mmol) and 2,4-dinitrophenylhydrazine (1.5 mmol) were synthesized and characterized with 1H-NMR. The synthesized SDPH was used as ligands in the formation of Co(II) metal complexes. The Co(II)-SDPH complexes were synthesized with reflux reaction at 60oC for 6 hours in molar ratio 1:3. Triethylamine is used to synthesis Co(II)-SDPH, which serves to deprotonate SDPH ligands. ESI-MS analysis showed that the complex is a neutral dimeric complex.The complex has the chemical formula [Co2(SDPH)2[(Et)3N]2(acn)2(OH)2} ([M+Na]+ = 1061 g/ mol), shown on the ESI-MS spectrum. Coordinate bonds between Co (II) metal ions with ligands are observed in the presence of shifting of the C=N wave number, as well as the loss of the vibrating peaks of the O-H groups to the infrared spectra of complexes. The IR spectrum of complexes was suggested that SDPH behave as a bidentate ligand through the azomethine nitrogen atom and phenolic oxygen atom. The ligand and its Co(II) complex have been screened for antioxidant activity against DPPH (2,2-diphenyl-1-picrylhydrazine). Based on the activity test results, the IC50 value of Co(II)-SDPH complex was lower than ligand. These results show that Co(II)-SDPH are potentials as antioxidants.
Physico-Chemical Characteristics of Lampung Natural Zeolite Functionalized Mercapto-Silane Yulyani Nur Azizah; Faizal Rachman
EduChemia (Jurnal Kimia dan Pendidikan) Vol 8, No 1 (2023)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v8i1.18514

Abstract

Lampung natural zeolite (ZAL) is a potential adsorbent for metal pollutants.However, its adsorption capacity is still low due to the presence of impurities that cover the pores and active sites on its surface. To improve the adsorption performance, especially on soft acid Lewis metals/cations, ZAL needs to be activated and functionalized with organosilanes containing thiol groups (-SH) as soft Lewis bases such as (3-mercaptopropyl) trimethoxysilane (MPTMS). This study aims to determine the physicochemical properties of organosilane-modified natural zeolites. The MPTMS silanization process in ethanol: water (1:1, v/v) media was carried out on ZAL activated with 1 M HCl. Qualitatively, the success of the functionalization can be directly observed from the dispersion of the zeolite in organic and aqueous phases, where the hydrophobicity of the silane-modified zeolite (ZM-EA) increased compared to the natural zeolite. The functional group analysis results showed typical peaks of S-H and C-H at 2554 and 2930 cm-1. MPTMS functionalization produced five peaks of the typical diffraction pattern of clinoptilolite at 2θ: 10,4o; 17,8o; 22,8o; 28,3o; 30,5o; dan 32,4o. SEM-EDX results on ZM-EA showed the presence of a sulfur component of 4.75% (% At) with a Si/Al ratio >7.
Co-Authors Damar Nurwahyu Bima Deana Wahyuningrum Faizal Rachman Hendrawati Hendrawati Irma Mulyani Niah Kusuma Hapsari