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All Journal Jurnal Matematika & Sains
Susanto Imam Rahayu
Inorganic and Physical Chemistry Group, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Bandung
Mathematics

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Lanthanum (III) Selective Electrode Based on 1,10-Diaza-4,7, 13,16-Tetraoxacyclooctadecane-N,N’-Diacetic Acid (DACDA) as an Ionophore Susanto Imam Rahayu; Buchari Buchari; Indra Noviandri; Suyanta Suyanta
Jurnal Matematika & Sains Vol 11, No 1 (2006)
Publisher : Institut Teknologi Bandung

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A lanthanum(III) ion selective electrode based on ionophore 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-N,N-diacetic acid was studied. The electrode was prepared with an inner solution system in a membrane composition that contained an active ionophore 1,10-diaza-4,7-13,16-tetraoxacycloocta decana-N,N-diacetic acid (DACDA), an anionic side potassium tetrakis (4-chlorophenyl) borate (KTCPB), a plasticizer o-nitro phenyl octyl ether (NPOE) and a polyvinyl chloride (PVC) matrix support. A good response was obtained with a slope of 19.53 ± 1.62 mV/decade and the electrode gave responses with a detection limit of 3.92x10-6 M. The measurement range was wide (10-5-10-1 M) and the responses time was about 27 seconds. The electrode could measure lanthanum ion with a few interfering alkali, earth alkali and transition elements.
Synthesis and Magnetic Properties of a Fe-Mn-Cr Multinuclear Complex with 4-Amino-1,2,4-triazole and Oxalate Ligands Iis Siti Jahro; Djulia Onggo; Ismunandar Ismunandar; Susanto Imam Rahayu; Esther Jacoba Martha Vertelman; Petra van Koningsbruggen
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

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A multinuclear Fe-Mn-Cr complex with 4-amino-1,2,4-triazole (NH2trz) and oxalate (ox) ligands has been synthesized successfully. The formula of the [Fe(NH2trz)3][ClO4][MnCr(ox)3].4H2O complex has been obtained based on the metal and C, H, N contents. The presence of water molecules, metal-ligand bonding and bridge ligand in the multinuclear complex has been confirmed by its infrared spectrum. The compound crystallizes in the hexagonal system with cell parameters of a = b = 18.695 Å and c = 57.351 Å. The compound shows a gradual spin crossover for iron(II) in the [Fe(NH2trz)3]2+ with transition temperature (T1/2) of 205 K. The antiferromagnetic interaction between Cr(III) and Mn(II) ions in the [MnCr(ox)3]n n- network is observed from the Weiss constant (θ) of -2.3 K.
Co-Authors Bohari M. Yamin Buchari Buchari Djulia Onggo Esther Jacoba Martha Vertelman Iis Siti Jahro Indra Noviandri Ismunandar Ismunandar . Petra van Koningsbruggen Suyanta Suyanta