A5042175515- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Crystallography and molecular interactions
- Metal complexes synthesis and properties
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Metal-Organic Frameworks: Synthesis and Applications
- Crystal structures of chemical compounds
- Catalytic Processes in Materials Science
- Photochemistry and Electron Transfer Studies
- Porphyrin and Phthalocyanine Chemistry
- Molecular Junctions and Nanostructures
- Synthesis and Characterization of Heterocyclic Compounds
- Luminescence and Fluorescent Materials
- Advanced Photocatalysis Techniques
- Organic Light-Emitting Diodes Research
- TiO2 Photocatalysis and Solar Cells
- Metal-Catalyzed Oxygenation Mechanisms
- Chemical Synthesis and Analysis
- Phenothiazines and Benzothiazines Synthesis and Activities
- Molecular Sensors and Ion Detection
- Electron Spin Resonance Studies
- Nanomaterials for catalytic reactions
- Supramolecular Chemistry and Complexes
- Nanocluster Synthesis and Applications
University of Canterbury
2015-2025
Christ University
2014-2020
Christchurch Clinical Studies Trust
2014-2018
MacDiarmid Institute for Advanced Materials and Nanotechnology
2009-2014
University of Otago
2002-2009
Université de Montréal
2004-2006
University of Ferrara
2004-2006
Los Alamos National Laboratory
2004
University of Waterloo
2002
Synchrotron XPS was used to investigate a series of chemically-synthesised, atomically-precise gold clusters Au(n)(PPh(3))(y) (n = 8, 9, 11 and 101, with y depending on cluster size) immobilized titania nanoparticles. The were washed toluene at 100 °C or calcined 200 remove the organic ligand. From position Au 4f(7/2) peak it is concluded that size not altered through deposition. analysis phosphorous spectra, can be applied heat treatment removes ligands. Washing calcination leads partial...
Objective To determine whether novel multi‐energy spectral photon‐counting computed tomography ( SPCCT ) imaging can detect and differentiate between monosodium urate MSU ), calcium pyrophosphate CPP hydroxyapatite HA crystal deposits ex vivo. Methods A finger with a subcutaneous gouty tophus calcified knee meniscus excised at the time of surgery were obtained. The was imaged using plain x‐ray, dual‐energy CT DECT . Plain x‐ray images acquired. For validation purposes, samples crystals...
The nature of Au cluster precursor and activation treatments affect catalyst activity in aerobic benzyl alcohol oxidation.
Abstract TiO 2 photocatalyst is of interest for antimicrobial coatings on hospital touch-surfaces. Recent research has focused visible spectrum enhancement photocatalytic activity. Here, we report with a high degree nanostructure, deposited stainless steel as solid layer more than 10 μm thick by pulsed-pressure-MOCVD. The coating exhibits rarely-reported microstructure comprising anatase and rutile in composite amorphous carbon. Columnar single crystals are segmented into 15–20 nm plates,...
The first example of an iridium biscyclometalated complex with a C∧N∧C 2,6-diphenylpyridine (dppy)-type ligand, [(4'-(4-bromophenyl)-2:2',6':2' '-terpyridine)Ir(2,6-diphenyl-4-(4-tolyl)pyridine)](NO3) (1), has been synthesized and characterized by various techniques such as X-ray crystallography, mass spectrometry, 1H 13C NMR, cyclic voltammetry, both steady-state time-resolved emission absorption studies. Preliminary density functional theory calculations have also conducted. 1 crystallizes...
A family of tridendate ligands 1 a-e, based on the 2-aryl-4,6-di(2-pyridyl)-s-triazine motif, was prepared along with their hetero- and homoleptic Ru(II) complexes 2 a-e ([Ru(tpy)(1 a-e)](2+); tpy=2,2':6',2"-terpyridine) 3 ([(Ru(1 a-e)(2)](2+)), respectively. The were characterized by (1)H NMR spectroscopy, ES-MS, elemental analysis. Single-crystal X-ray analysis a e demonstrated that triazine core is nearly coplanar non-coordinating ring, dihedral angles 1.2 18.6 degrees, redox behavior...
A new series of iridium cyclometalated complexes with a C/N/C dppy-type ligand and N/N/N tpy-type have been synthesized characterized by various techniques such as mass spectrometry, 1H 13C NMR, cyclic voltammetry, both steady-state time-resolved emission absorption studies, time-dependent DFT (TDDFT) calculations. The exhibit strong visible absorptions long-lived (1.6-2.0 micros) emissions (lambdamax, ca. 680 nm) in room-temperature solution. calculations on the ground-state geometry match...
Abstract A new family of ruthenium(II) complexes with multichromophoric properties was prepared based on a “chemistry‐on‐the‐complex” synthetic approach. The compounds are tridentate chelating sites (tpy‐type ligands, tpy=2,2′:6′,2′′‐terpyridine) and most them carry appended anthryl chromophores. Complexes 2 b were synthesized through the Pd‐catalyzed Suzuki coupling reaction between 9‐anthrylboronic acid chloro ligands presursor species 1 , respectively. monocoupling product c also as...
The dinuclear ruthenium complex of a large, planar bis-tridentate bridging ligand has been prepared; to the best our knowledge, this species is near IR-emitting Ru(II) exhibiting longest-lived emission and highest quantum yield reported so far, due dramatic reduction in its radiationless decay rate constant.
We show here that the surface of MnO2 nanorods can be modified with aryl groups by grafting from aqueous and non-aqueous solutions aryldiazonium salts. X-ray photoelectron spectroscopy provides direct evidence for covalent bonding to through oxygens.
Hydantoins are important scaffolds in natural products and pharmaceuticals, with only a few synthetic strategies available for their asymmetric preparation. We herein describe single-step enantioselective synthesis of 5-monosubstituted hydantoins via condensation glyoxals ureas the presence chiral phosphoric acid at room temperature. Products were formed up to 99% yield 98 : 2 e.r. Using mechanistic kinetic studies, including time course 1H NMR monitoring, we revealed that reaction likely...
The crystal structures of tris(ethylmethylamino)-cyclopropenium chloride and tris(diethylamino)-cyclopropenium iodide reveal the presence closely bound dicationic dimers formed from two closed-shell monomer units. distances between C3 centroids staggered monomers are at short end those normally found in π-stacked neutral arenes, let alone charged aromatic rings. Computational analysis reveals that short-range interactions dominated by strong dispersion forces, enabling metastable to form...
We report the synthesis of two novel Hofmann-type metal–organic frameworks, [Co(H2mdp)(Ni(CN)4)] and [Fe(H2mdp)(Ni(CN)4)], using a pyrazole based organic linker. Both materials show good selectivity for C 2 H 3 6 several gas separations.
The Negishi cross-coupling reaction creates a new binding site in ruthenium complex with high efficiency as exemplified by the synthesis of heterodimetallic ruthenium-osmium complex.
A new family of easily prepared and functionalised terpyridine-like ligands exhibit room-temperature luminescence as their Ru(II) complexes.
The resonance Raman and infrared spectra of the bridging ligand 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine (bptz) have been studied. Ab initio calculations on bptz radical anion bptz·− are able to predict frequencies intensities vibrational spectra. This analysis is used interpret spectroscopy bridged binuclear complexes [(bpy)2Ru(μ-bptz)Ru(bpy)2]4+ (1) [(PPh3)2Cu(μ-bptz)Cu(PPh3)2]2+ (2) their redox products. 1 reveals bichromophoric nature complex, with bpy modes being enhanced selectively as a...
A simple and fast method for the synthesis of Schiff bases was developed. series were synthesized by reaction aromatic aldehydes with primary amines in presence catalytic amount Cu(NO3)2, 6H2O ethanol or acetonitrile at room temperature. Some major advantages this environmentally benign procedure are high yields, use available catalyst, easy workup short times.
The compound [(Cu(PPh3)2)3(HATNMe6)](BF4)3 has been synthesized and characterized by X-ray crystallography, resonance Raman spectroscopy, density functional theory (DFT) calculations. structure of solvated [rhombohedral, R3̅, a = b 21.6404(4) Å, c 53.188(3) α β 90°, γ 120°] shows that the HATNMe6 ligand is very slightly twisted. electronic absorption spectrum complex in chloroform two bands visible region attributed to ligand-centered (LC) metal-to-ligand charge-transfer (MLCT) transitions,...
In the reaction zone: Reaction of an aryltriazene with acid generates corresponding aryldiazonium ion. When this takes place in mixing zone, at interface between two streams flowing laminarly and parallel through a 100 μm microchannel, submicrometer line organic film is grafted substrate surface.
Heterodinuclear ruthenium(II)–cobalt(III) complexes have been prepared as part of investigations into a new approach to selective cancer treatment. A cobalt(III) centre bearing amine ligands, which serve models for cytotoxic nitrogen mustard is connected by bridging ligand ruthenium(II)–polypyridyl moiety. Upon excitation the ruthenium visible light, electron transfer results in reduction cobalt(II) and consequent release its ligands. We synthesised several such structures demonstrated their...
Abstract The ligand dipyrido[3,2-a:2′,3′-c]phenazine (dppz) and its deuterated analogues, d4-dppz, d6-dppz, d10-dppz, [ReCl(CO)3] complexes with these ligands have been synthesized. Using DFT calculations it is possible to calculate a geometry of the such that matches crystallographic data for variety dppz complexes. B3LYP/6-31G(d) frequency correspond closely experimental IR Raman data. Analysis calculated normal modes vibration reveals presence number are localized ring sections...