Sains Malaysiana 40(9)(2011): 999–1006

Synthesis, Characterization and Thermal Properties of Two Novel Lanthanide 2,2’-Biquinoline-4,4’-Dicarboxylate Complexes

(Sintesis, Pencirian dan Sifat Terma Dua Kompleks Lantanida 2,2’-bikuinolin-4,4’-dikarboksilat)

S. Zati-Hanani, R. Adnan*, A.F.A. Latip & C.S. Sipaut

Pusat Pengajian Sains Kimia, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia

Diserahkan: 16 Jun 2010 / Diterima: 6 Januari 2011

ABSTRACT

Two new lanthanide coordination complexes with 2,2’-biquinoline-4,4’-dicarboxylic acid (H2bqda) and 1,10-phenanthroline (phen), [La2(Hbqda)2(bqda)2(phen)]n [1] and [Gd(bqda)1.5(phen)]n [2] were successfully synthesized and characterized. The complexes were obtained through hydrothermal method at 170oC for 3 days. The metal to acid to 1,10-phenanthroline ratio, 1:1:2 had been chosen to synthesize 1 and 2. The percentage yield for 1 and 2 was 68% and 75%, respectively calculated based on the starting lanthanide salt used. The yellow coloured complexes were found to be stable at room temperature and insoluble in organic solvents. The complexes obtained were characterized by elemental analysis (CHN), infrared spectroscopy (FTIR) and thermogravimetric (TGA) analysis. The FTIR spectra of these complexes confirm the complexation had taken place by the existence of COO- symmetric and asymmetric stretching peaks at 1385 and 1542-1532 cm-1, respectively.

Keywords: 1,10-phenanthroline; 2,2’-biquinoline-4,4’-dicarboxylic acid; hydrothermal method; lanthanide

ABSTRAK

Dua kompleks koordinatan baru lantanida dengan asid 2,2’-bikuinolin-4,4’-dikarboksilik (H2bqda) dan 1,10-fenantrolina (phen), [La2(Hbqda)2(bqda)2(phen)]n [1] dan [Gd(bqda)1.5(phen)]n [2] telah berjaya disintesis dan dicirikan. Kompleks ini telah diperoleh melalui kaedah hidroterma pada suhu 170oC selama 3 hari. Nisbah logam kepada asid kepada 1,10-fenantrolin, 1:1:2, telah dipilih untuk mensintesiskan 1 dan 2. Peratus hasil bagi 1 dan 2 masing-masing adalah 68% dan 75% dikira berdasarkan garam lantanida yang digunakan. Kompleks berwarna kuning ini didapati stabil pada suhu bilik dan tidak larut dalam pelarut organik. Kompleks yang diperoleh telah dicirikan menggunakan analisis unsur (CHN), spektroskopi inframerah (FTIR) dan analisis termogravimetri (TGA). Spektra FTIR bagi kompleks membuktikan pengkompleksan telah berlaku dengan kewujudan puncak simetrik dan asimetrik COO- masing-masing pada 1385 dan 1542-1532 cm-1.

Kata kunci: asid 2,2’-bikuinolin-4,4’-dikarboksilik; kaedah hidroterma; lantanida; 1,10-fenantrolina

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*Pengarang untuk surat-menyurat; email: r_adnan@usm.my