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All Journal JURNAL KIMIA SAINS DAN APLIKASI POSITRON Jurnal Kimia Khatulistiwa Jurnal Sains dan Teknologi Alchemy : Journal of Chemistry Jurnal Sains dan Teknologi Kimia SEMIRATA 2015 Biopropal Industri Jurnal Farmasi Sains dan Komunitas Journal Of Chemical Process Engineering (JCPE) ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry Chemistry Indonesian Journal of Chemical Research CHEESA: Chemical Engineering Research Articles Jurnal Teknologi Lingkungan Lahan Basah Journal Of Chemical Process Engineering al Kimiya : Jurnal Ilmu Kimia dan Terapan

Imelda Hotmarisi Silalahi

Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Tanjungpura University, Jl. Ahmad Yani, Pontianak 78124, West Kalimantan, Indonesia

Author-ID : 5301149

Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health

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Bandgap Energy of TiO₂/M-Chlorophyll Material (M=Cu²⁺, Fe³⁺) Muhammad Yusprianto; Titin Anita Zaharah; Imelda Hotmarisi Silalahi
Jurnal Kimia Sains dan Aplikasi Vol 24, No 4 (2021): Volume 24 Issue 4 Year 2021
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The bandgap energy (Egap) of TiO2 material modified with metal-chlorophyll complex compounds (M = Cu2+, Fe3+) was observed. Chlorophyll (Chl) was isolated from cassava leaves, and its UV-Vis spectra showed absorption peaks in the Soret band region (410 nm) and in the Q band region (665 nm), which is the typical peak of chlorophyll. Copper(II)-chlorophyll complex was prepared from the reaction between chlorophyll and CuSO4.5H2O, while the iron(III)-chlorophyll was synthesized from chlorophyll and FeCl3.6H2O in methanol solvent under reflux at 65°C. The presence of copperand iron metals in the chlorophyll metal complexes was identified using Atomic Absorption Spectroscopy in methanol solution. The absorption of copper measured in Cu2+-Chl was 0.0488 (0.4805 mg/L), while the iron atom in Fe3+-Chl was 0.0050 (0.0195 mg/L). The UV-vis spectra demonstrate the hypsochromic shift of the Soret band to 405 nm (Cu2+-Chl) and 402 nm (Fe3+-Chl). The Infrared spectra of chlorophyll after being complexed with copper(II) shows the increase of vibrational absorption wavenumber of the C=N group from 1225.06 cm-1 to 1241.94 cm-1 indicates the coordination of the metal ion on the N atom in the pyrrole ring. The shift in the absorption band on the Fe3+-Chl spectrum was seen for the C=O ester group from 1720.49 cm-1 to 1721.10 cm-1 indicating the metal ion bonding in the C=O group of esters. The DR-UVis analysis of TiO2/metal-chlorophyll shows a bathochromic shift towards the visible light region. By using the Tauc plot method, it was observed that the Egap of TiO2 reduces from 3.08 eV to 2.89 eV and 2.93 eV in the compound of TiO2/Cu2+-Chl and TiO2/Fe3+-Chl, respectively.

Synthesis of Metal–Curcumin Complex Compounds (M = Na⁺, Mg²⁺, Cu²⁺) Peni Peni; Risya Sasri; Imelda Hotmarisi Silalahi
Jurnal Kimia Sains dan Aplikasi Vol 23, No 3 (2020): Volume 23 Issue 3 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Curcumin complex compound, MLn (L = curcumin; M = Na+, Mg2+, Cu2+) has been synthesized from the reaction between curcumin and metal precursors (NaCl, MgSO4.7H2O, CuCl2.2H2O) in ethanol under reflux conditions. Synthesis takes place through the reaction between the metal ions Na+, Mg2+, or Cu2+ as the central atom and curcumin as the ligand. Curcumin has been consumed after the reaction lasts for four hours, shown by thin-layer chromatography in which a new spot appears at higher Rf as the spot of curcumin disappears in the reaction mixture. Compared with the spectrum of curcumin, the FTIR spectra of the complexes show changes in the absorption bands and shifts of wave numbers particularly in absorption bands of phenolic –OH and C=O enol groups which strongly indicates the coordination of metal ions with the curcumin ligand which is proposed to be in β–1,3 diketone system. Also, the FTIR spectra of the reaction product showed typical absorption bands for the metal-oxygen group, M–O, at 524 cm–1, 670 cm–1 and 470 cm–1 in Na+–curcumin, Mg2+–curcumin and Cu2+–curcumin, respectively.

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+) Imelda Hotmarisi Silalahi; Risya Sasri; Peni Peni; Titin Anita Zaharah
Jurnal Kimia Sains dan Aplikasi Vol 25, No 1 (2022): Volume 25 Issue 1 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Bandgap energy (Egap) of TiO2/curcumin as well as TiO2/M-curcumin (M = Na+, Mg2+, Cu2+) was determined. The material was prepared on transparent conductive oxide as TiO2 film. Then, the curcumin and curcumin derivatives were adsorbed on TiO2 surface by immersing the film in solution of the compounds. The diffuse reflectance UV-Vis spectra of the materials were recorded and utilized to calculate the Egap using the Tauc plot method. The calculation gave the Egap of TiO2 of 3.27 eV that lowers after being deposited with curcumin and metal-curcumin compounds. The Egap of TiO2/curcumin was 2.82 eV, while TiO2/Na+-curcumin, TiO2/Mg2+-curcumin, and TiO2/Cu2+-curcumin were 2.36, 3.11, and 2.15 eV, respectively. Curcumin metal complexes, i.e., TiO2/Cu2+-curcumin, showed high molar absorptivity and effectively deposited on the TiO2 lowers the bandgap energy of TiO2 compared to free-curcumin on TiO2.

Co-Authors Afghani Jayuska Amanda, Ferdian Rizki Angelina, Dina Anis Shofiyani Ari Widiyantoro Arif Sulaiman Aritonang, Anthoni Batahan Chris Octavianus Dina Angelina Emy Awalliah Endah Sayekti Ernilia, Kristina Fabiani, Verry A. Firdaus, Giska Ristianty Gusrizal Gusrizal Harlia Harlia Heni Pujiastuti Henry Martua Tampubolon Henry Martua Tampubolon, Henry Martua Illen Stevani Julan Julan Kartika, Novi Lestari, Agustina Duwan Muhammad Yusprianto Muhammad Yusprianto Naselia, Uray Amira Nelly Wahyuni Nikmatun Khasanah Nurhadini Nurhadini Nurlina, Nurlina Omarta Omarta Peni Peni Peni Peni Puji Ardiningsih Putri, Rinka Carolina Risya Sasri Roberta Anjelia Rudiyansyah Rudiyansyah Sadenta, Deby Pascalia Sari Damayanti Sembiring, Albert Septiani Septiani Septiani Septiani Thamrin Usman Thamrin Usman Thamrin Usman Titin Anita Titin Anita Zahara Titin Anita Zahara, Titin Anita Titin Anita Zaharah Titin Anita Zaharah Titin Anita Zaharah Titin Anita Zaharah Ullica, Dheasi Rani Uray Amira Naselia Uray Amira Naselia Wanda Rossalina Winda Rahmalia Winda Rahmalia Winda Rahmalia Yossy Yossy Zaharah, Titin Anita Zéphirin Mouloungui

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