AbstrakSebatian baru terbitan tiourea, 1-etil-1-(2-hidroksi-etil)-3-naftalen-1-il-tiourea (3a) dan 1-(fenil-amino)-3-naftalen-1-il-tiourea (3b) telah berjaya disintesis melalui tindak balas antara 1-naftil isotiosianat (1) dengan etilena 2-etilaminoetanol (2a) dan fenilhidrazina (2b) menggunakan kaedah penyinaran mikrogelombang dan kaedah refluks. Peratusan hasil bagi kedua-dua kaedah yang digunakan untuk sebatian 3a dan 3b masing-masing adalah 3a (refluks: 66%, mikrogelombang: 98%) dan 3b (refluks: 72%, mikrogelombang: 97%). Hasil sintesis dianalisa dengan menggunakan alat spektroskopi FT-Inframerah (FT-IM), Spektroskopi Resonan Magnetik Nuklear (RMN) dan Spektrometri Jisim. Kajian antimikrob juga dilakukan dengan menggunakan Staphylococcus aureus dan Bacillus subtillus sebagai Gram positif, Escherichia coli dan Salmonella typhimurium sebagai Gram negatif dan kulat yang digunakan adalah Aspergillus niger. Kawalan positif yang digunakan adalah streptomisin dan kanamisin, manakala kawalan negatif yang digunakan adalah DMSO. Walaubagaimanapun hasil kajian mendapati tiada perencatan yang ketara terhadap pertumbuhan bakteria dan kulat (hanya 6-7mm kawasan perencatan) menggunakan sebatian tiourea ini.Kata kunci: sebatian tiourea, mikrogelombang, aktiviti antimikrob Abstract New thiourea derivatives, 1-ethyl-1-(2-hydroxy-ethyl)-3-naphthalen-1-yl-iourea (3a), 1-(phenyl-amino)-3-naphthalen-1-ylTiourea (3b) have been synthesized from the reaction of naphthylisothiocyanate with 2-(ethylamino)ethanol (2a) and phenylhydrazine (2b) using microwave irradiation method. The percentage yield for both method used for compound 3a and 3b, respectively 3a (reflux: 66%, microwave: 98%) and 3b (refluks: 72%, mikrogelombang: 97%).The compounds were analyzed by using Spectrometer FT-Infrared (FT-IR), Spectrometer Nuclear Magnetic Resonance (NMR) and Mass Spectrometry. Antimicrobial study was also conducted using Staphylococcus aureus and Bacillus subtillus as Gram positive, Escherichia coli and Salmonella typhimurium as Gram negative and fungi Aspergillus niger is used. The positive control used was streptomycin and kanamycin, while DMSO was used as the negative. However, this study shows no inhibition of bacteria and fungi (6-7mm of inhibition area) using these thiourea compounds.Keywords: thiourea compound, microvawe, antimicrob activity Pengenalan Tiourea adalah sebatian organosulfur yang mempunyai formula SC(NH 2 ) 2 . Struktur molekulnya sama seperti urea kecuali kedudukan oksigen digantikan dengan sulfur. Dalam satu kajian terbitan tiourea, kompleks poli(etilena
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