Indones. J. Chem., 2018, 18 (4), 755 - 765 Noor Syafiqah Habdul Latif et al. 755 * Corresponding author. Email address : nurnadia@ns.uitm.edu.my DOI: 10.22146/ijc.34703 Synthesis, Structural, Density Functional Theory, and X-Ray Diffraction Study of Zn(II) N-Isopropylbenzyldithiocarbamate: Anti-Corrosion Screening in Acid Media Noor Syafiqah Habdul Latif 1 , Sheikh Ahmad Izaddin Sheikh Mohd Ghazali 1 , Erna Normaya Abdullah 2 , Azizul Hakim Lahuri 3 , Mohammad Fadzlee Ngatiman 4 , and Nur Nadia Dzulkifli 1* 1 Faculty of Applied Sciences, Universiti Teknologi MARA Negeri Sembilan Branch, Kuala Pilah Campus, 72000 Negeri Sembilan, Malaysia 2 Experimental and Theoretical Research Laboratory, Department of Chemistry, Kulliyah of Science, International Islamic University Malaysia, Bandar Indera Mahkota, 25200 Kuantan, Pahang, Malaysia 3 Department of Basic Science and Engineering, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu, 97008 Sarawak, Malaysia 4 Center for Research and Instrumentation Management (CRIM), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia Received March 12, 2018; Accepted August 1, 2018 ABSTRACT Corrosion of metal is a serious issue across many industries and is considered costly. Acids used during the cleaning process in industries may contribute to metal erosion. Dithiocarbamate is a ligand that can act as a corrosion inhibitor due to the presence of sulfur and nitrogen as electronegative atoms. Zn(II) N-isopropylbenzyldithiocarbamate (Zn[N-isopbenzdtc]2) complex was synthesized through direct synthetic method of < 4 °C and characterized using Fourier Transform Infrared-Attenuated Total Reflectance (FTIR-ATR), Ultraviolet-Visible (UV-Vis), Nuclear Magnetic Resonance (NMR), X-ray crystallography study, molar conductivity, melting point, and gravimetric analysis. Corrosion inhibition of mild steel was studied for different corrosive media (1 M HCl and 1 M H2SO4). The synthesized inhibitor was studied at different concentrations of 1, 2, 3, 4, and 5 mM at 40 °C. As a conclusion, as the inhibitor concentration decreased, the efficiency of the corrosion inhibitor also decreased at a constant temperature. In this study, it showed that the corrosion activity of mild steel in 1 M H2SO4 was higher compared to 1 M HCl due to the higher concentration of H + , which makes H2SO4 more corrosive than HCl. Keywords: dithiocarbamate; corrosion inhibitor; mild steel; acid ABSTRAK Korosi logam merupakan masalah serius di banyak industri dan dianggap mahal. Asam yang digunakan selama proses pembersihan dalam industri dapat menyebabkan erosi logam. Ditiokarbamat adalah ligan yang dapat bertindak sebagai inhibitor korosi karena kehadiran sulfur dan nitrogen sebagai atom elektronegatif. Zn(II) N- isopropilbenzilditiokarbamat (Zn [N-isopbenzdtc]2) kompleks disintesis melalui metode sintetik langsung < 4 °C dan dikarakterisasi menggunakan Fourier Transform Infrared-Attenuated Total Reflectance (FTIR-ATR), Ultraviolet-Visible (UV-Vis), Nuclear Magnetic Resonance (NMR), studi kristalografi sinar-X, konduktivitas molar, titik leleh, dan analisis gravimetri. Penghambatan korosi baja ringan dipelajari untuk media korosif yang berbeda (1 M HCl dan 1 M H2SO4). Inhibitor yang disintesis dipelajari pada konsentrasi yang berbeda dari 1, 2, 3, 4, dan 5 mM pada 40 °C. Sebagai kesimpulan, ketika konsentrasi inhibitor menurun, efisiensi inhibitor korosi juga menurun pada suhu konstan. Dalam penelitian ini, menunjukkan bahwa aktivitas korosi baja ringan dalam 1 M H2SO4 lebih tinggi dibandingkan dengan 1 M HCl karena konsentrasi H + yang lebih tinggi, yang membuat H2SO4 lebih korosif daripada HCl. Kata Kunci: ditiokarbamat; inhibitor korosi; baja ringan; asam INTRODUCTION Acids are normally used for the removal of undesirable scale and rust in metalwork, especially in chemical cleaning process [1]. Dithiocarbamates are sulfur-nitrogen containing ligands that possess a diversity of coordination chemistry. Dithiocarbamate is a flexible class of monoanionic 1,1-dithio ligand which