Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
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Australian Journal of Chemistry

Australian Journal of Chemistry

Volume 69 Number 1 2016

CH14735A Label-Free Colorimetric Biosensor for 17β-Estradiol Detection Using Nanoparticles Assembled by Aptamer and Cationic Polymer

Dongwei Zhang, Weilin Zhang, Jiayun Ye, Shenshan Zhan, Bing Xia, Jing Lv, Hanchu Xu, Gaoshang Du and Lumei Wang
pp. 12-19
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In this paper, a sensitive and selective biosensor for the detection of 17β-estradiol (E2) was developed using gold nanoparticles (AuNPs), label-free E2-specific aptamer, and poly(diallyldimethylammonium chloride) (PDDA).

CH15200Syntheses and Structures of Homodinuclear (Na–Na) and Heterodinuclear (Cu–Na, Cu–K) Metal Complexes

Rui Jia, Ting Gao, Ruoxi Chen, Yu Yang, Po Gao, Yan Wang and Pengfei Yan
pp. 20-26
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We examine two types of heterodinuclear metal complexes [CuIINaI(HL1)2(SbF6)]n (1) and [CuIIKI(HL1)2(PF6)]n (2), which are derived from the tridentate ligand o-vanillin (HL1), including transition metal ions (CuII) and main group metal ions (NaI and KI). Furthermore, we utilise N,N′-ethylene-bis(3-methoxysalicylideneimine) (H2L2), a kind of Schiff base, to synthesise a homodinuclear sodium complex [Na2(H2L2)2] (3) and studied the structure of this complex.

CH15141Efficiently Converting CO2 into C2H4 using a Porphyrin–Graphene Composite Photocatalyst

Meihua Piao, Nan Liu, Yanshu Wang and Chunsheng Feng
pp. 27-32
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Novel photocatalysts consisting of porphyrin and graphene were designed to reduce CO2 to hydrocarbons under visible light. These catalysts can (1) effectively reduce CO2 to hydrocarbons, particularly to C2H4; (2) selectively control the photogenerated electrons transfer from graphene to CO2 rather than H2O; and (3) induce reduction and oxidation on different components of the photocatalyst, thus reducing the complexity of investigating the mechanism of the photocatalyst.

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The construction of four distinct ZnII coordination polymers has been successfully achieved based on a neutral versatile tripyridyltriazole linker, the diverse structures of which can be effectively regulated by the synergistic modulation of counter-ions and adaptable conformations of the organic linker.

CH15250Fabrication of TiO2/Ag/Ag2O Nanoparticles to Enhance the Photocatalytic Activity of Degussa P25 Titania

Safyan A. Khan, Shahid Ali, Manzar Sohail, Mohamed A. Morsy and Zain H. Yamani
pp. 41-46
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A simple chemical reduction approach was used to synthesize Ag nanoparticles (NPs) over a reputed photocatalyst, Degussa P25 titania. Ag NPs were then partially oxidized by treatment with hydrogen peroxide. The resulting P25/Ag/Ag2O nanocomposite exhibited better photodegradation activity than P25 and Ag3PO4 for non-biodegradable dyes under visible light irradiation.

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The ring-opening copolymerization of CHO and maleic anhydride (MA) in bulk and solution was studied in detail using a series of diallyl-modified (salen)Mn complexes. The best catalytic performances were obtained using the following copolymerization procedure: CHO/MA/catalyst/DMAP molar ratio of 250 : 250 : 1 : 1, polymerization time of 300 min, and reaction temperature of 110°C in toluene.

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A new ZnII coordination polymer based on trinuclear [Zn3(COO)6] cluster subunits has been obtained under solvothermal conditions. Luminescence properties for the title compound dispersed in different organic solvents reveal that it has a unique selectivity for detection of CCl4 molecules via a fluorescence quenching mechanism.

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Acidic cleavage of pyrazolo[1,5-b][1,2,4,6]thiatriazines 1 afforded pyrazolo-guanidines, which upon reaction with one-carbon electrophiles, provided various 4-substituted pyrazolo[1,5-a][1,3,5]triazines. Alcoholysis and aminolysis of 7-benzyl-pyrazolo[1,5-b][1,2,4,6]thiatriazines 2 afforded sulfamates and sulfamides. Thermal rearrangement of compounds 2 furnished 6-benzyl-pyrazolo[3,4-e][1,2,4]thiadiazines.

CH15161DFT and SERS Study of Adsorption of 1,4-Dimethoxy-2-nitro-3-methylanthracene-9,10-dione onto Silver Nanoparticles

K. Geetha, T. N. Rekha, M. Umadevi, Beulah J.M. Rajkumar, G.V. Sathe, P. Vanelle, T. Terme and O. Khoumeri
pp. 76-84
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The adsorption mechanism, orientation of 1,4-dimethoxy-2-nitro-3-methylanthracene-9,10-dione molecule onto silver surface, and charge transfers have been investigated based on DFT and SERS methods. As anthraquinone derivatives have been recently used as potent anti-tumour drugs, the adsorption studies reported in the current investigation can pave way to the potential application of DMNMAD in drug delivery.

CH15184Kinetics of Hydrolysis of N-Methyl-2,4-dithiophenobarbital

Monika Tarsa, Małgorzata Starek, Grzegorz Żuchowski, Anna Stasiewicz-Urban and Marek Cegła
pp. 89-97
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Using N-methyl-2,4-dithiofenobarbital as an example, we investigated how the position of the methyl group, and introducing a second sulfur atom in place of oxygen in the carbonyl group, affects the rate of hydrolytic degradation. The method was also applied to study the effect of pH and temperature and a probable pathway of chemical changes.

CH15267A New Protocol for Total Synthesis of Natural Product Frutinone A and Its Derivatives

Kang Lei, Dong-Wei Sun, Yuan-Yuan Tao and Xiao-Hua Xu
pp. 98-106
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A new protocol for total synthesis of natural product frutinone A was accomplished in three steps by using inexpensive 2′-hydroxyacetophenone as starting material. Twenty target compounds were synthesized. The synthetic route features good yield, transition metal-free and mild reaction conditions, and high tolerance for functionality, thereby allowing easy substitutions around the frutinone A core.

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A series of random copolypeptides, i.e. poly(γ-propyl-l-glutamate)-graft-(oligo-ethylene-glycol)-random-poly(γ-benzyl-l-glutamate)s (PPLG-g- OEG3-ran-PBLG) with similar main chain lengths and various compositions of oligo-ethylene-glycol (OEG) and benzyl pendants were readily prepared in three steps, including ring-opening polymerization, nucleoplilic substitution, and copper-mediated alkyne–azide 1,3-dipolar cycloaddition. The cloud point temperature, in the range of 22–53°C, can be readily obtained by controlling the OEG/benzyl composition.

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Three-dimensional (3D) BiOBr/BiOI hierarchical microspheres were successfully fabricated on the surface of fly ash cenospheres (FACs) via a facile one-pot solvothermal method for the first time. The photophysical properties of the as-prepared samples were fully characterized. The photodegradation tests examining the removal of rhodamine B from water under visible light irradiation (λ > 420 nm) showed that BiOB/BiOI-FACs displayed superior photocatalytic activity to BiOBr-FACs and BiOI-FACs. The enhanced photocatalytic activity mechanism of BiOB/BiOI-FACs was proposed.

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