Malaysian Journal of Analytical Sciences Vol 20 No 6 (2016): 1311 - 1317

DOI: http://dx.doi.org/10.17576/mjas-2016-2006-09

 

 

 

SYNTHESIS, CHARACTERIZATION AND ELECTOCHEMICAL

STUDIES OF 4-METHOXYBENZOYLTHIOUREA DERIVATIVES

 

(Sintesis, Pencirian dan Kajian Elektrokimia Terhadap Terbitan 4-Metoksibenzoiltiourea)

 

Karimah Kassim^1,2*, Noor Khadijah Mustafa Kamal¹, Adibatul Husna Fadzil³.

 

¹Faculty of Applied Sciences

²Institute of Science

Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

³Faculty of Applied Sciences,

Universiti Teknologi MARA (Perak), Kampus Tapah, 35400 Tapah Road, Tapah, Perak, Malaysia

 

*Corresponding author: karimah@salam.uitm.edu.my

 

 

Received: 17 August 2015; Accepted: 11 October 2016

 

 

Abstract

Three new 4-methoxybenzoylthiourea derivatives namely N-phenyl-N’-4-methoxybenzoylthiourea (A), N-(2-methoxy-phenyl)-N’-4-methoxybenzoylthiourea (B) and N-(2-nitrophenyl)-N’-4-methoxybenzoylthiourea (C) has successfully synthesized and characterized by elemental analysis, Fourier Transform Infrared (FTIR), proton (¹H) and carbon (¹³C) Nuclear Magnetic Resonance (NMR) spectroscopy. Result obtained for IR showed the presence of important bands of the compounds such as ν(N-H), ν(C=O), ν(C-N) and ν(C=S) which were observed at 3200 cm^-1, 1670 cm^-1, 1200 cm^-1 and 700 cm^-1, respectively. The ¹H chemical shifts for CONH and CSNH had been observed around 9 ppm and 12 ppm, respectively. For the ¹³C resonance, the signal of C=O and C=S had been observed at 180 ppm and 200 ppm, respectively. The efficiency of the synthesized compounds was investigated as corrosion inhibitor of mild steel in 1.0 M H₂SO₄ by using linear polarization resistance (LPR) technique.

 

Keywords:  4-methoxybenzoylthiourea, spectroscopy, corrosion inhibitor

 

Abstrak

Tiga terbitan 4-metoksibenzoiltiourea iaitu N-fenil-N’-4-metoksibenzoiltiourea (A), N-(2-metoksifenil)-N’-4-metoksi benzoiltiourea (B) and N-(2-nitrofenil)-N’-4- metoksibenzoiltiourea (C) telah berjaya disintesis dan dicirikan dengan penganalisis unsur, spektroskopi infra merah (IR), proton (¹H) dan karbon (¹³C) resonans magnet nuklear (RMN). Hasil daripada IR menunjukkan kumpulan penting dalam sebatian seperti ν(N-H), ν(C=O),  ν(C-N) and ν(C=S) yang terdapat pada 3200 cm^-1, 1670 cm^-1, 1200 cm^-1 and 700 cm^-1. Anjakan kimia ¹H untuk CONH dan CSNH telah dilihat pada 9 ppm dan 12 ppm. Bagi resonans ¹³C, C=O dan C=S dapat dilihat pada 180 ppm dan 200 ppm. Keberkesanan sebatian yang disintesis telah dikaji sebagai perencat kakisan keluli lembut dalam 1.0 M H₂SO₄ dengan menggunakan teknik rintangan polarisasi linear.

 

Kata kunci:  4-metoksibenzoiltiourea, spektroskopi, perencat kakisan

 

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