Australian Journal of Chemistry (AUST J CHEM )

Publisher: Commonwealth Scientific and Industrial Research Organization (Australia); Institute of Physics (Great Britain). Australian Branch; Australian National Research Council; Australian Academy of Science, CSIRO Publishing


Australian Journal of Chemistry - an International Journal for Chemical Science publishes research papers from all fields of chemical science and technology, including synthesis, structure, new materials, macromolecules, supramolecular chemistry, biological chemistry, nanotechnology, surface chemistry, and analytical techniques.

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  • Website
    Australian Journal of Chemistry website
  • Other titles
    Australian journal of chemistry
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  • Material type
    Periodical, Internet resource
  • Document type
    Journal / Magazine / Newspaper, Internet Resource

Publisher details

CSIRO Publishing

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    • Author can archive a post-print version
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    • On author or institutional repository
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  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper we demonstrate that the Turkevich reaction can be used to obtain not only spherical gold nanoparticles of various sizes, but also nanoparticles of different morphologies. The effect of the molar ratios of citrate to HAuCl4 at various temperatures has been studied, and it is found that the reagent ratio plays a significant role in defining the morphology of the gold nanosystems formed at low temperatures. This study shows that by controlling the reagent ratios and the reaction temperature of the Turkevich reaction nanostructured gold systems with various shapes, including spheres, wires, networks and systems comprising only polygonal nanoparticles or only nanochains, the latter two for the first time, can be obtained. The gold nanosystems obtained in this fashion were characterized by transmission electron microscopy and UV-Vis absorption spectroscopy
    Australian Journal of Chemistry 08/2014;
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    ABSTRACT: We demonstrate the utilisation of an azomethine 1,3-dipolar cycloaddition reaction with carbon fibre to graft complex molecules onto the fibre surface. In an effort to enhance the interfacial interaction of the fibre to the matrix, the functionalised fibres possessed a pendant amine that is able to interact with epoxy resins. Functionalisation was supported by X-ray photoelectron spectroscopy and the grafting process had no detrimental effects on tensile strength compared with the control (untreated) fibres. Also, microscopic roughness (as determined by atomic force microscopy) and fibre topography were unchanged after the described treatment process. This methodology complements existing methodology aimed at enhancing the surface of carbon fibres for advanced material applications while not compromising the desirable strength profile. Single-fibre fragmentation tests show a statistically significant decrease in fragment length compared with the control fibres in addition to transverse cracking within the curing resin, both of which indicate an enhanced interaction between fibre and resin.
    Australian Journal of Chemistry 07/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Polyoxometalates are robust and versatile multidentate oxygen-donor ligands, eminently suitable for coordination to trivalent lanthanoid ions. To date, 10 very different structural families of such complexes have been found to exhibit slow magnetic relaxation due to single-molecule magnet (SMM) behaviour associated with the lanthanoid ions. These families encompass complexes with between one and four of the later lanthanoid ions: Tb, Dy, Ho, Er, and Yb. The lanthanoid coordination numbers vary between six and eleven and a range of coordination geometries are evident. The highest energy barrier to magnetisation reversal measured to date for a lanthanoid–polyoxometalate SMM is Ueff/kB = 73 K for the heterodinuclear Dy–Eu compound (Bu4N)8H4[DyEu(OH)2(γ-SiW10O36)2].
    Australian Journal of Chemistry 07/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: A new sterically bulky Schiff base ligand,N-(8-quinolyl)-5-tert-butylsalicylaldimine (Hqsal-5-tBu) has been prepared and a series of FeIII complexes, [Fe(qsal-5-tBu)2]Y (Y¼Cl 1, ClO4 2, NO3 3, BF4 4) utilising this ligand are reported and fully characterised. UV-vis spectroscopic and electrochemical studies indicate that 1–4 are high spin (HS) in solution at room temperature and further suggest that the tBu group only slightly alters the electronic properties of 1–4 compared with related [Fe(qsal-5-X)2]+ systems. The structures of [Fe(qsal-5-tBu)2]Cl�.4MeOH�.H2O 1, [Fe(qsal-5-tBu)2]ClO4.�MeOH 2 and [Fe(qsal-5-tBu)2]NO3 3 determined at 100K reveal HS FeIII centres in all cases. Four-fold parallel aryl embraces and pi–pi interactions serve to link the cations forming 2D sheets mirroring the motifs found in other [Fe(qsal-5-X)2]+ complexes. Despite this the tBu group causes strong distortions at the Fe centre which as magnetic studies reveal prevent spin crossover trapping 1–4 in the HS state.
    Australian Journal of Chemistry 06/2014;
  • Australian Journal of Chemistry 06/2014;
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    ABSTRACT: Electrospinning has attracted great attention in recent years from different industries including biomedical engineering. Due to the relative ease of fabricating ultrafine fibers with core-shell structures, emulsion electrospinning has been investigated intensively for making nanofibrous delivery vehicles for local and sustained release of bioactive or therapeutic substances, especially biomolecules such as growth factors. In preparing emulsions for electrospinning, different surfactants, ionic or non-ionic, can be used, which may subsequently influence the evolution of the core-shell structure in electrospun emulsion jet or fiber. In this investigation, emulsions consisting of deionized water or phosphate buffer saline as the water phase, a poly(lactic-co-glycolic acid) solution as the oil phase and Span 80 (a non-ionic surfactant) or sodium dodecyl sulfate (SDS, an ionic surfactant) were electrospun into fibers for studying the core-shell structure and its evolution in emulsion electrospun fibers. Different microscopies were employed to study the morphological changes of the water phase in fiber samples collected at different locations along the jet (or fiber) trajectory during emulsion electrospinning. It was found that the evolution of fiber core-shell structure was significantly different when different surfactants were used. If Span 80 was the surfactant, the water phase within the thick emulsion jet (or fiber) close to the Taylor cone existed in a discrete state whereas in ultrafine fibers collected beyond certain distance from the Taylor cone, a mostly continuous water phase core was observed. If SDS was the surfactant, the core-shell structure in the thick jet (or fiber) was irregular but relatively continuous. A single core core-shell structure was eventually developed in ultrafine fibers. The core-shell structure in electrospun fibers and its evolution were also affected by the emulsion composition (e.g., polymer solution concentration, water phase volume, and ion addition in the water phase).
    Australian Journal of Chemistry 05/2014;
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    ABSTRACT: 2-Mercaptopropionyl glycine (MPG) is also known as Tiopronin, is a free - radical scavenger, a detoxicating synthetic aminothiol which also acts as an antioxidant with a wide range of clinical applications. The oxidation of MPG by aqueous bromine and acidified bromate has been studied by spectrophotometric techniques. The stoichiometry for the reaction of acidic bromate with MPG is 1:1, HS(CH3)CH(=O)N(H)CH2COOH + BrO3- → HO3S(CH3)CH(=O)N(H)CH2COOH + Br-; with reaction occurring only at the thiol center. For the direct reaction of bromine with MPG, the stoichiometric ratio is 3:1, HS(CH3)CH(=O)N(H)CH2COOH + 3Br2 + 3H2O →HO3S(CH3)CH(=O)N(H)CH2COOH + 6H+ + 6Br- In excess acidic bromate conditions the reaction displays an initial induction period followed by sharp and rapid increase in absorbance at 390 nm due to rapid bromine formation. The direct reaction of aqueous bromine with MPG was much faster than oxidation of the thiol by acidified bromate. The detection of thiyl radicals confirms the involvement of radicals as intermediates in the oxidation of MPG by acidified BrO3-. The involvement of thiyl radicals in oxidation of MPG competes with a non-radical pathway involving two-electron oxidations of the sulfur center. A bimolecular rate constant of 5.68 (± 0.94) x 103 M-1 s-1 for the direct reaction of MPG with bromine was determined. ESI spectral data shows that MPG is oxidized through its sulfinic acid, by-passing the unstable sulfenic acid. The product of a 2-electron oxidation of MPG rapidly disproportionates to the sulfinic acid and the unoxidized MPG, and hence no trace of the sulfenic acid intermediate was observed from ESI spectral data even after a limited oxidation of 2-electron equivalents of MPG. A simplified reaction network consisting of 19 reactions was simulated and it gave a very good fit to the experimental data.
    Australian Journal of Chemistry 04/2014;
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    ABSTRACT: The existence of selective microwave absorption phenomena in the synthesis of CdSe quantum dots has been investigated. These types of microwave effects involving selective microwave absorption by specific reagents have recently been proposed in the microwave-assisted synthesis of various nanoparticles. In the present study, the microwave synthesis of CdSe quantum dots was investigated according to a protocol published by Washington and Strouse to clarify the presence of selective microwave heating. Importantly, control experiments involving conventional conductive heating were executed under otherwise (except for the heating mode) identical conditions, ensuring the same heating and cooling profiles, stirring rates, and reactor geometries. Comparison of powder X-ray diffraction, UV-vis, photoluminescence, and transmission electron microscopy data of the obtained CdSe quantum dots reveals that identical types of nanoparticles are obtained independently of the heating mode. Therefore, no evidence for a selective microwave absorption phenomenon could be obtained.
    Australian Journal of Chemistry 04/2014;
  • Australian Journal of Chemistry 01/2014;
  • Australian Journal of Chemistry 01/2014;

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