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Indonesian Journal of Chemistry

ijc
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Published by Universitas Gadjah Mada

ISSN : 14119420 EISSN : 24601578 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

Indonesian Journal of Chemistry is an International, peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry including applied chemistry. The journal is accredited by The Ministry of Research, Technology and Higher Education (RISTEKDIKTI) No : 21/E/KPT/2018 (in First Rank) and indexed in Scopus since 2012. Since 2018 (Volume 18), Indonesian Journal of Chemistry publish four issues (numbers) annually (February, May, August and November).

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Articles 20 Documents

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Search results for , issue "Vol 7, No 2 (2007)" : 20 Documents clear

CYCLOPENTYL TRISILANOL SILSESQUIOXANES – MODIFIED NATURAL RUBBER (CpSSQ(OH)3– ENR-50) NANOCOMPOSITE IN THE PRESENCE OF TIN (II) CHLORIDE DIHYDRATE H. Rosniza; M. A. Bakar; S. Abdul Hamid; J. Ismail
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

A nanocomposite comprising cyclopentyl trisilanol silsesquioxanes (CpSSQ(OH)3) and 50% epoxidized natural rubber (ENR-50) was prepared at reflux temperature with Tin (II) chloride dihydrate (SnCl2.2H2O) as catalyst. SnCl2.2H2O was found to be an affective catalyst to promote ring opening in ENR-50 and tailored it to CpSSQ(OH)3 via chemical reaction. The generation of carbonyl functional groups arising from epoxide ring opening can be clearly seen in FTIR spectra. 1H and 29Si NMR analyses further proved that the incorporation of CpSSQ(OH)3 in ENR-50 occured. TGA studies showed a degradation temperature with 10% weight decreased and DSC thermogram indicates a single Tg. Single peak in XRD diffractogram at 2-Theta angle further confirmed the surface modification.

SYNTHESIS AND CONFORMATIONS OF p-(ACETAMIDO)-BUTOXYCALIX[4]ARENE AND p-(BENZAMIDO)-BUTOXYCALIX[4]ARENE Firdaus Firdaus; Jumina Jumina; Hardjono Sastrohamidjojo
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

The conversion of p-(amino)butoxycalix[4]arene, 1, to p-(acetamido)butoxy-calix[4]arene, 2, and p-(benzamido)butoxycalix[4]arene, 3, via acetylation and benzoylation reactions, respectively have been conducted. The acetylation reactions was conducted by reflux method and room temperature method. The reflux method was conducted by refluxed a solution of 1 and acetic anhydride in acetic acid glacial solvent for 12 hours to result 2 in 53.8% yield; while the room temperature method was conducted by stirred a solution of 1, acetyl chloride, and dry pyridine in dry toluene solvent and inert atmosphere at room temperature for 24 hours to result 2 in 97.8% yield. By the room temperature method and using benzoyl chloride, the compound 3 was obtained in 67.1% yield. Structures of the both compounds were confirmed using IR, 1H NMR, and 13C NMR spectroscopy methods. Pursuant to the 1H-NMR spectral patterns of their bridge methylene and calix aryl protons, they were known that the compound 3 exist in partial cone conformation; whereas the compound 2 exist in partial cone, cone, and 1,2-alternate conformations where the partial cone was the main conformer.

ORTHO-CHLOROANILINE DEGRADATION UNDER THE INFLUENCE OF OZONE IN AQUEOUS SOLUTION Ermin Katrin Winarno
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

The degradation study on 2-chloroaniline (2-ClA) used as a model of water pollutant by ozonation was performed. The change of spectrum and substrate concentration of treated solutions were measured by spectrophotometer as well as by HPLC method. The change of solutions pH after ozonization was observed. The yields of the products formed (chloride ions, ammonium ions, and formaldehyde) were investigated as a function of ozonation time. The results showed that the ozonation gave to an efficient degradation of 2-ClA.

1D AND 2D NMR STUDIES OF 2–(2–(BENZYLOXY)–3–METHOXYPHENYL)–1H–BENZIMIDAZOLE Mohammed Hadi Al–Douh; Shafida Abd Hamid; Hasnah Osman
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

The reaction of Benzyl o-vanillin 1 and o-phenylene diamine 2 in dichloromethane produced new benzimidazole, 3. The complete assignments of 3 were made using 1D and 2D NMR including COSY, HMQC and HMBC NMR in CDCl3 and acetone-d6. The coupling constants J are reported in Hertz, and the differences in the peak splittings using both solvents are discussed.

THE DISTRIBUTION OF COMMERCIAL CROWN ETHER DC18C6 AND THE EXTRACTION STUDY OF ALKALI AND EARTH ALKALI METALS Bambang Rusdiarso
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

Distribution of A and B isomers of crown-ether DC18C6 on their organic and water phases (chloride, nitrate and sulphocyanide salts) and extraction of alkali and earth alkali metals has been studied. In LiCl 0.1 M environment, lithium extraction could be ignored. The presence of extracted potassium metal may affect the crown ether DC18C6 distribution albeit only a little. In KNO3 0.1 M environment, the distribution coefficient values (d) were 6.1 and 10.3 for A and B isomers, respectively ; while in KCl 0.1 M environment the values were 4.9 and 11.8, respectively. In KSCN 0.1 M, d values for A and B isomers were 40.4 and 36.6, respectively, which were higher than the value obtained from both KNO3 and KCl 0.1 M environments. Caesium metal extraction using DC18C6 occurred weakly, up to only 5%. Strontium extraction using DC18C6 achieved better yield than the caesium extraction. The percentage of extraction increased under organic solvent according to the following: toluene (4%) < chloroform (28%) < TBP (35%).

SYNTHESIS AND CHARACTERIZATION OF CdS IN DIOL VANILIN LIQUID CRYSTAL MONOMER H. L. Lee; M. Abu Bakar; J. Ismail; A.M. Issam
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

Nanocomposites comprising diol-vanilin and cadmium sulfide (CdS) has been synthesized via chemical precipitation method in ethanol at refluxed temperature (160 oC) for 12 hours. CdCl2. 2.5H2O and thiourea as cadmium and sulfide precursors respectively were employed. Diol vanilin is a thermotropic liquid crystal monomer which exhibits enantiotropic nematic metaphase texture when observed under polarizing microscope and confirmed by DSC thermal stability study. A series of different mass composition of diol vanilin and CdS nanocomposites ranging from 0.1:1.0 till 1.0:1.0(w/w) were prepared and characterized using XRD, TEM, SEM-EDX, POM and DSC. The X-ray diffraction pattern (XRD) showed broad peaks due to the formation of cubic CdS nanoparticles in diol vanilin matrix. The nanocomposites at low mass composition of CdS still maintained their nematic phase. However, the liquid crystal property was affected when the mass composition of CdS in nanocomposite was increased and the liquid crystal characteristic vanished when the mass composition was at 0.6:1.0.

MONTE CARLO SIMULATION OF I-, Br-, AND Cl- IN WATER USING AB INITIO PAIR POTENSIAL FUNCTIONS Harno Dwi Pranowo
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

Monte Carlo simulations were performed for I-, Br- and Cl-, in water using ab initio pair potential. The systems consisting of one anion in 215 solvent molecules have been simulated at 298 K. Anion-water pair potentials have been newly developed based on ab initio calculations of split valence basis set plus polarization quality. The structure of the solvated ion is discussed in terms of radial distribution functions, coordination number and pair potential distribution. Structural properties were investigated by means of radial distribution functions and their running integration numbers, leading for the first solvation shell to an average 12.60 H2O around I- with I--O distance of 3.74 Å and I--H distance of 2.86 Å, 11.84 H2O around Br- with Br--O distance of 3.40 Å and Br--H distance of 2.42 Å, and 10.68 H2O around Cl- with Cl--O distance of 3.20 Å and Cl--H distance of 2.24 Å, respectively. The structure of the water-anion complexes are agreed with dipole orientation. Pair energy distribution of hydrated anions showed that the pair interaction energy are increase from I-, Cl-, to Br-, namely, -6.28, -9.98 and -13.67 kcal/mol, respectively. The coordination number distribution analysis for the first solvation shell of the all hydrated anions indicated a high exchange rate for the first solvation shell ligands.

THE EFFECT OF CONCENTRATION OF CARRIER, pH AND TIME OF EXTRACTION ON SEPARATION'S FACTOR OF PENICILLIN G - PHENYL ACETATE BY REACTIVE EXTRACTION Imam Santoso; Buchari Buchari; M. Bachri Amran; Aminudin Sulaeman
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

The aim of this research is to study the effect of concentration carrier, pH and time of extraction on separation's factor of penicillin g - phenyl acetate by reactive extraction technique. The 10 mL aqueous solution with variation of pH : 5, 6 contains 0.001 M penicillin G and 0.001 M phenyl acetate has been extracted with 10 mL n-butyl acetate contains dioctylamine as carrier. Variation concentration of carrier were 0.000; 0.002; 0.004; 0.006 and 0.008 M. Variation time of extraction were 1, 5, 10, 15 and 20 min. The penicillin G and phenyl acetate that dissolved in organic phase ha been reextracted with 10 mL aqueous with variation of pH : 7, 8. The optimum condition obtained as follow : concentration dioctylamine was 0.002M ; pH the first phase water was 5 and the second phase water was 8 ; and the time of extraction was 10 min.

SYNTHESIS OF UK-3A ANALOGUE AND ASSAY ON P 388 MURINE LEUKEMIA CELLS Y Anita; M Hanafi; AMJ Putra; S Arifin; Y Usuki; H Iio
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

UK-3A is secondary metabolite of Streptomyces sp.517-02 which has IC50 38 µg/mL against P388 Murine Leukemia cells. An analogue of UK-3A was synthesized from L-methyl serine as the starting material by amidation and esterification. An analogue UK-3A was analyzed and identified by TLC, FT-IR, LC-MS and NMR spectrometer. It was found to have IC50 15.4µg/mL against the same Leukemia cells. The overall yield was 87.10%.

THE ENZYMATIC EFFECT (α-AMYLASE) ON VISCOSITY AND CARBOHYDRATE COMPOSITION OF MAIZE FLOUR MODIFIED Suarni Suarni; Tj. Harlim; Ambo Upe; Abd R. Patong
Indonesian Journal of Chemistry Vol 7, No 2 (2007)
Publisher : Universitas Gadjah Mada

Technology is required in making new product of maize flour. Enzymatic modification of three varieties of maize flours i.e. MS2, Srikandi and Local product has been conducted using α-amylase from mung bean sprouts has been carried out in Laboratorium Bioproses BB Pascapanen Bogor. A research was performed used the flour without addition of sprouts (as control) and with addition of 10, 20, 30 % of sprouts. Parameters observed were the change in viscosity of the maize flour; amylose, glucose and oligosaccharide contents. Results showed that there were changes in polymerization degree, dextrose equivalent, amylase content, viscosity (50 oC), viscosity (50 ºC/20΄), and carbohydrate composition. An enzymatic treatment using 20% of sprout to the three varieties gave results as follows: amylose content was 20.02 - 24.02%, viscosity (50 ºC) was 210 - 230 BU, and viscosity (50 ºC/20΄) was 200 - 220 BU. Functional properties of the flour fulfilled with the soft texture product, such as food material for children under five years old. Data of the modified flour can be utilized by consuments as an alternative food material.

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