VOLUME 7, NO2, JUN 1985

THE INTERACTION OF TWO HEAVY METAL IONS AT THE IRON (III) HYDROXIDE/SOLUTION INTERFACE

The interaction of the Zn2+ and Ni2+ ions at the iron (III) hydroxiede/solution interface was studied as a function of the constant initial pH and over the metal ion concentration range 1-6 ppm. For each mole of heavy metal ion adsorbed, approximately two moles of H+ ions were displaced from the interface. These results are used for expressing the adsorption data as a function of the solution concentration of both H+ and metal ions. The results obtained permit the interfacial reaction to be described by the equation: 2SH + M2+ = S2M + 2H+ Were S represents a surface site. read more

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IKRAM UL HAQ ,S MUSTAFA ,

MASS SPECTROMETERIC FRAGMENTATION OF SATIVANINE-A AND -B*1

 Detailed mass spectrometric fragmentation pattern and structure of 14-membered cyclopeptide alkaloids; sativanine-A (1) and sativanine-B (2) are discussed. read more

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R TSCHESCHE ,G ECKHARDT ,A H SHSH ,

GEMINAL NONEQUIVALENCE AND STEREODYNAMICS IN SOME N-(1-ARYLETHYLIDENE) ISOBUTYLAMINES

The geminal anisochronism of the isobutyl groups indicate that the aryl ring is twisted out of the imino plane leading to a chiral conformation. Barriers to rotation around the aryl-imino bond were found by dynamic NMR to lie in the range 16.9-17.9 kcal mol-1 read more

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SALIM S AL-SHOWIMAN ,

DETERMINATION OF SIZE AND SHAPE OF THE MICELLES BY DISSYMMETRY METHOD IN DIFFERENT SELECTIVE SOLVENTS

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M KALEEM BALOCH ,NOOR AHMAD ,

A KINETIC STUDY ON THE DETERMINATION OF HYDRAZINE BY IODINE IN SULPHURIC ACID MEDIA

The kinetics of the reaction between iodine and hydrazine was studied spectrophotometrically for full understanding of the proper conditions under which the reaction is fast and quantitative. The hydrogen ions were fond to exert an enormous influence to and by the system that results in positive errors of the reaction order. The reaction was found to be complete within twenty seconds just above pH 4.5.A suitable buffer is recommended to be used for governing the pH decrease during the titration. Hydrazine free base acts as the active reductant and iodine as a two electron oxidant. Nitrogen gas (N2) was detected by mass spectrometry as the major product for hydrazine oxidation. A possible mechanism for the reaction under certain conditions was suggested. read more

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S A AL-TAMRAH ,A M AL-HAJJAJI ,A M AZIZ AL RAHMAN ,SALIM M SULTAN ,I Z AL-ZAMIL ,

SYNTHESIS AND SOME ADDITION REACTIONS OF 1-ARYL-3-CYCLOPROPYL-PROP-1-EN-3-ONES

Condensation of cyclopropyl methyl ketone with aromatic aldehydes gave 1-Aryl-3-cyclopropyl-prop-1-ene-3-ones (I). Addition reactions of bromine, hydrazine, and some active methylene compounds to (I) have been investigated. Structures of the products have been established by elemental analysis, IR, and PMR spectroscopic methods. read more

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M A HASSAN ,A A HAMED ,

METAL-CHELATE EQUILIBRIA OF T1+, UO22+, Th4+ WITH (L)2-AMINO-BUTANEDIOIC ACID-4-AMIDE IN AQUEOUS MEDIA

Interactions between T1+, UO22+, Th4+ and (L)2-amino-butanedioic acid-4-amide have been investigated at different temperature 25o, 35o and 45oC and ionic strengths u = [0m0, 0.1, 0.2, 0.5 and 1.0M KNO3] in aqueous media using a pH titration technique. The data suggest the formation of 1:1 complex with T1+ and UO22+ and 1:1 and 1:2 complexes with Th4+ ions in the pH range 6.3-9.2, 3.3-6.0 and 2.5-5.5 respectively. Formation constants have been evaluated employing Calvin and Melchior’s extension of Bjerrum’s method. The thermodynamic stability constants and other function –D Go, D Ho and D So accompanying complexation have also been evaluatedread more

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K K SAXENA ,R S SAXENA ,S SHARMA ,

CHLOROSULPHONATION OF SOME ANILIDES

Cinnamanilide (I), the N(p-chloro) (XVI) and 4-chloro (XXVII) derivatives by reaction with chlorosulphonic acid gave the sulphonyl chlorides (II, XVII, XXVIII); these were reacted with nucleophiles, e.g. amines, azide ion and hydrazine to give 28 compounds. Oxalanilide (XXXV), the 4, 4'-di-chloro derivative (XLV) and malonanilide (LIV; X=H) similarly afforded the sulphonyl chlorides (XXXVI, XLVI and LV) which were characterized as 30 derivatives. In contrast, 4,4'-dichloromalonanilide (LIV; X=Cl) failed to give the sulphonyl chloride with chlorosulphonic acid. The spectral data of selected compounds are briefly discussed. read more

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O SHODE ,R J CREMLYN ,J G BLOY ,K PATHAK ,F J SWINBOURNE ,

A TERNARY MOLECULAR INCLUSIVE COMPLEX FROM CROWN ETHER, CYCLODEXTRIN AND POTASSIUM 4-NITROPHENOLATE FORMATION AND SPECTROSCOPIC STUDIES

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SUMBAL MAHMUD ,A RASHID KAUSAR ,

SPECTROPHOTOMETRIC DETERMINATION OF PLATINUM (II) USING HEXACHLOROIRIDATE(IV)

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HASAN M KHAN ,