https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Analysis of gold in solutions containing ionic liquids by inductively coupled plasma atomic emission spectometry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3326 Wed 24 Jul 2013 22:21:31 AEST ]]> Mono- and dinuclear copper(II) complexes of pendant-arm macrocyclic polyamines: synthesis, characterization and investigation as hydrolytic cleavage agents for DNA https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3261 Wed 11 Apr 2018 14:44:37 AEST ]]> An electrochemical quartz crystal microbalance study into the deposition of manganese dioxide https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3211 Wed 11 Apr 2018 14:25:49 AEST ]]> Epitaxial retrieval of a disappearing polymorph https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27296 Wed 11 Apr 2018 12:46:32 AEST ]]> Hydrothermal MnO2: synthesis, structure, morphology and discharge performance https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:651 5 M), where alpha-MnO2 is formed, and high temperatures (>80degreesC) where beta-MnO2 is formed. The structural variety of gamma-MnO2 in this domain of stability is interpreted in terms of: (i) the fraction of De Wolff defects (P,), which is found to increase as the H2SO4 concentration is decreased and the temperature is increased; (ii) microtwinning (T-w), which despite being less statistically significant, is found to follow a similar trend; (iii) the cation vacancy fraction; (iv) the Mn(III) fraction. Both the latter structural properties decrease as the temperature is increased; but decreasing the H2SO4 concentration leads to a decrease in cation vacancy fraction and an increase in Mn(III) fraction. These structural characteristics, in particular the De Wolff defects, are interpreted on a molecular level in terms of soluble Mn(III) intermediate condensation, in which the electrolyte conditions determine the relative proportions of equatorial-axial edge sharing (ramsdellite domains only), and equatorial-axial corner sharing (both ramsdellite and pyrolusite domains) that occurs. Morphological differentiation is easily established due to the different characteristics of each phase. gamma-MnO2 exists as fine needles (250 nm x 50 nm), beta-MnO2 is formed as much larger columns (1 mum x 100 nm), while alpha-MnO2 is present as small spheres of up to 400 nm in diameter. Electrochemical characterization by voltammetry in an aqueous 9 M KOH electrolyte demonstrates that the performance of gamma-MnO2 Samples is comparable with that of commercial EMD, whereas alpha- and beta-MnO2 suffer from diffusional limitations which lower their operating voltage. For gamma-MnO2, superior performance results when lower temperatures and H2SO4 concentrations are used. This corresponds to intermediate levels of De Wolff defects and microtwinning, and to a cation vacancy fraction minimum.]]> Thu 25 Jul 2013 09:10:27 AEST ]]> Reaction kinetics and mechanism of formation of MnW6O24 (8-) by hypochlorous acid oxidation of Mn(II)(aq) in the presence of tungstate https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:435 Thu 25 Jul 2013 09:10:00 AEST ]]> Phosphate ester hydrolysis promoted by an amidopyridine carboxylate complex https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43351 Thu 15 Sep 2022 15:25:40 AEST ]]> Coordination chemistry of a new rigid, hexadentate bispidine-based bis(amine)tetrakis(pyridine) ligand https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30 Zn2+ >> Ni2+ < Co2+, which is not the typical Irving-Williams behavior. The preference for large M-N distances also emerges from relatively high redox potentials (the higher oxidation states, that is, the smaller metal ions, are destabilized) and from relatively weak ligand fields (dd-transition, high-spin electronic ground states). The potentiometric titrations confirm the efficient encapsulation of the metal ions since only 1:1 complexes are observed, and, over a large pH range, ML is generally the only species present in solution.]]> Sat 24 Mar 2018 11:02:46 AEDT ]]> Symmetrical diamides based on 2,6-bis(methoxycarbonyl)pyridine: syntheses and metal ion binding studies https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:8393 Sat 24 Mar 2018 08:40:59 AEDT ]]> Complexation of constrained ligands piperazine, N-substituted piperazines, and thiomorpholine https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7350 Sat 24 Mar 2018 08:40:14 AEDT ]]> Electrochemical detection of DNA hybridization by using a zirconia modified renewable carbon paste electrode https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7474 Sat 24 Mar 2018 08:38:47 AEDT ]]> Synthesis and crystal structure of the palladium(IV) polyoxomolybdate, K₀.₇₅Na₃.₇₅[PdMo₆O₂₄H₃.₅]·17H₂O https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:9344 Sat 24 Mar 2018 08:36:29 AEDT ]]> Direct electron transfer of glucose oxidase immobilized on a mesoporous silica KIT-6 matrix to screen-printed electrodes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:8063 Sat 24 Mar 2018 08:34:23 AEDT ]]> Superior hydrolytic DNA cleavage by a dinuclear copper(II) N4S4-donor complex compared with a mononuclear N2S2-donor close analogue https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:2960 Sat 24 Mar 2018 08:30:59 AEDT ]]> Metal complex-promoted cleavage of RNA dimers and trimers: electrospray ionisation mass spectrometry evidence for cleavage https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:1424 Sat 24 Mar 2018 08:28:14 AEDT ]]> Heavy metals in wastewater: the effect of electrolyte composition on the precipitation of cadmium(II) using lime and magnesia https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:1767 Sat 24 Mar 2018 08:27:37 AEDT ]]> 'Green' leaching: recyclable and selective leaching of gold-bearing ore in an ionic liquid https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:2443 Sat 24 Mar 2018 08:26:53 AEDT ]]> Synthesis, characterization, and crystal structure of a tricadmium complex of 3,4-diamino-5-methyl-1,2,4-triazole https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:15319 3(DAMT)2(DAMTH)2cl8] have been prepared and identified by elemental analyses, infrared, Raman, ¹H and ¹³C NMR spectroscopy, and a single crystal X-ray diffraction. The protonation equilibria of the ligand have been studied by pH-potentiometry, with pK₁ 13.29 and pK₂ 5.40 determined. The free ligand consists of triazole cations (DAMTH) and chloride counter ions. The neutral cadmium compound is a complex of the cationic ligand in which 3Cd's are coordinated by two unidentate cation forms of the ligands (DAMTH), two ambidentate neutral forms of the ligand (DAMT), and eight chlorides. Cadmium ions have slightly distorted octahedral geometry.]]> Sat 24 Mar 2018 08:26:36 AEDT ]]> An amperometric biosensor based on glucose oxidase immobilized in a sol-gel polyvinyl alcohol/silica hybrid composite film on a prussian blue modified electrode https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11386 Sat 24 Mar 2018 08:10:01 AEDT ]]> Conjoint analysis of kinetic and equilibrium data for mechanistic elucidation in polynuclear complexation reactions, exemplified by metal(II) helicate complex formation https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11161 Sat 24 Mar 2018 08:08:32 AEDT ]]> Synthesis and metal(II) ion complexation of pyridine-2, 6-diamides incorporating amino alcohols https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:10776 12. In the presence of metal(II) ions they undergo concomitant deprotonation and complexation to form [M(L-2H)] compounds. Formation constants have been determined for Cu(II), Ni(II), and Zn(II) complexes of the suite of ligands. Determined values for the two observed steps of log β ML-2H and log β ML-3H (where additional alcohol or coordinated water deprotonation occurs) are approximately −10 and −20, respectively. As pKa values of the diamide cannot be determined independently, absolute log KML-2H values for the di-deprotonated complexes cannot be definitively assigned, although estimates are made using predicted pKa values for the diamide. The circular dichroism spectra of optically active complexes were determined and are discussed.]]> Sat 24 Mar 2018 08:07:05 AEDT ]]> Complexation of the N,N',O-donor ligand N-trans-(2'-hydroxycyclohexyl)-2-aminomethylpyridine https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17417 py) facial Co(III) complexes are presented. Protonation constants for 1 and stability constants with Cu(II), Ni(II), and Zn(II) are reported, with both ML and ML₂ species defined. The trend for ML (log K₁ values for Cu, Ni, and Zn of 8.3, 6.9, and 5.3, respectively) is conventional. Protonation and stability constants with Cu(II) for N,N-bis(2-pyridylmethyl)amine (2) were also defined. The log K₁ value measured for 2 of 7.4 is very similar to that found for 1 of 8.3, despite the marked difference in the third donor group; it appears that the third donor of the tridentate ligand generally binds only poorly to Jahn–Teller elongated Cu(II) in solution.]]> Sat 24 Mar 2018 08:01:37 AEDT ]]> Metal-templated macrocycle synthesis in an ionic liquid: a comparison with reaction in protic solvents https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19655 Sat 24 Mar 2018 08:01:13 AEDT ]]> Interaction between cucurbit[8]uril and viologen derivatives https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5133 Sat 24 Mar 2018 07:49:39 AEDT ]]> Synthetic, structural, electrochemical and solvent extraction studies of neutral trinuclear Co(II), Ni(II), Cu(II) and Zn(II) metallocycles and tetrahedral tetranuclear Fe(III) species incorporating 1,4-aryl-linked bis-β-diketonato ligands https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5257 Sat 24 Mar 2018 07:46:35 AEDT ]]> From Spanish fly to room-temperature ionic liquids (RTILs): synthesis, thermal stability and inhibition of dynamin 1 GTPase by a novel class of RTILs https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5000 Sat 24 Mar 2018 07:44:09 AEDT ]]> Electrochemical detection of short DNA sequences related to the Escherichia coli pathogen using a zirconia-modified screen-printed DNA biosensor https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5642 Sat 24 Mar 2018 07:44:01 AEDT ]]> Heavy metals in wastewater: the effect of electrolyte composition on the precipitation of cadmium(II) using lime and magnesia https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:355 Sat 24 Mar 2018 07:42:36 AEDT ]]> Palladium(II) as a versatile template for the formation of tetraaza macrocycles via Mannich-type reactions https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:383 Sat 24 Mar 2018 07:42:31 AEDT ]]> Complexes of 2,6-bis[N-(2'-pyridylmethyl)carbamyl]pyridine: formation of mononuclear complexes, and self-assembly of double helical dinuclear and tetranuclear copper(II) and trinuclear nickel(II) complexes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52 Sat 24 Mar 2018 07:42:01 AEDT ]]> Metal-mediated pseudo coordination isomerism in complexes of mixed neutral didentate and dianionic tridentate pyridine-containing ligands https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3281 Sat 24 Mar 2018 07:22:25 AEDT ]]> Metallocene and organo-main group trifluoromethanesulfonates https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3279 Sat 24 Mar 2018 07:22:25 AEDT ]]> Methyl 2-[N-(2'-Pyridylmethyl)carbamyl]pyridine-6-carboxylate: a precursor for unsymmetrical diamide ligands https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3280 Sat 24 Mar 2018 07:22:25 AEDT ]]> Aminoalcohols incorporating piperazine ring: synthesis, complexation of a hexadentate ligand and DNA cleavage capability of copper(II) complexes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3214 Sat 24 Mar 2018 07:22:15 AEDT ]]> Isomers of 1,4,8,11-tetraazacyclotetradecane-6,13-dicarboxylate characterized as cobalt(lll) complexes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3226 Sat 24 Mar 2018 07:22:15 AEDT ]]> Synthesis and complexation of a chiral sexidentate pendant-arm macropolycyclic polyamino acid https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3229 Sat 24 Mar 2018 07:22:15 AEDT ]]> Synthesis of a four-strand N₂O₂-donor ligand and its transition metal complexation probed by electrospray ionisation mass spectrometry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3223 Sat 24 Mar 2018 07:22:15 AEDT ]]> Cyclic polyamines via a molybdenum(0) templated Mannich-type reaction https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3215 Sat 24 Mar 2018 07:22:14 AEDT ]]> Octahedral complexes of a mixed N,N,O-donor ligand N-trans-(2'-hydroxycyclohexyl)-2-aminomethylpyridine https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3221 Sat 24 Mar 2018 07:22:14 AEDT ]]> Isolation and structural characterization of Di- And tetra-protonated forms of the macrocyclic hexaamine trans-6,13-Dimethyl-1,4,8-11-tetraazacyclodecane- 6,13-diamine https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3188 Sat 24 Mar 2018 07:21:57 AEDT ]]> Interaction between tetramethylcucurbit[6]uril and some pyridine derivates https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3187 Sat 24 Mar 2018 07:21:56 AEDT ]]> Stability constants: a new twist in transition metal bispidine chemistry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3189 Sat 24 Mar 2018 07:21:56 AEDT ]]> Channel structures in a simple inorganic salt: an open framework formed through structural integration of distinct sodium acetate and sodium perchlorate domains https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3190 Sat 24 Mar 2018 07:21:55 AEDT ]]> Host-guest complex of a water-soluble cucurbit[6]uril derivative with the hydrochloride salt of 3-amino-5-phenylpyrazole https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:4714 Sat 24 Mar 2018 07:21:51 AEDT ]]> Complexation of a four-strand tetraalcohol with labile metal ions probed by electrospray mass spectrometry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3253 Sat 24 Mar 2018 07:21:20 AEDT ]]> Ionic liquids and metal ions: from green chemistry to ore refining https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3852 Sat 24 Mar 2018 07:19:57 AEDT ]]> Complexation kinetics of copper(II) and nickel(II) with macrocycles: identification of an outer-sphere chelate effect https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3186 Sat 24 Mar 2018 07:18:08 AEDT ]]> Host-guest complexes of cucurbit[8]uril with some pentaerythritol derivative guests https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25199 Sat 24 Mar 2018 07:14:02 AEDT ]]> A comparative analysis of teacher education by country https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31958 Mon 23 Sep 2019 11:19:10 AEST ]]> Synthesis and characterization of copper complexes with a series of tripodal amine ligands https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47588 4-p33) crystallized as a dinuclear complex, [Cu(Me4-p3H3)OH]2(ClO4)4, that could be structurally characterized. Interestingly, it turned out that in crystalline form the two bridging hydroxide ions were intact while two of the amine arms of the two ligands were protonated. DFT calculations were performed to get a better understanding of the behavior of this complex system in solution. Further protonation of two more amine ligand arms in solution was possible, still keeping the bridging hydroxide ions in place in the solid state. A related copper(II) complex system could be crystallized that contained a coordinated carbonate anion together with a protonated amine arm.]]> Mon 23 Jan 2023 14:42:36 AEDT ]]>