Citation data:
- Articles: 108
- h-index: 40 (Google Scholar)
- Citations: 3523
- Citations per paper: 33
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Chapters:
Wilton-Ely J, 2006, Dinuclear ruthenium and osmium compounds with metal-metal bonds, Comprehensive Organometallic Chemistry III, Editor(s): Crabtree, Mingos, Elsevier, Pages:647-716, ISBN:978-0080445908
Journal Articles:
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Journal articleEminov S, Filippousi P, Brandt A, et al., 2016,
Direct catalytic conversion of cellulose to 5-hydroxymethylfurfural using ionic liquids
, Inorganics, Vol: 4, ISSN: 2304-6740Cellulose is the single largest component of lignocellulosic biomass and is an attractive feedstock for a wide variety of renewable platform chemicals and biofuels, providing an alternative to petrochemicals and petrofuels. This potential is currently limited by the existing methods of transforming this poorly soluble polymer into useful chemical building blocks, such as 5-hydroxymethylfurfural (HMF). Ionic liquids have been used successfully to separate cellulose from the other components of lignocellulosic biomass and so the use of the same medium for the challenging transformation of cellulose into HMF would be highly attractive for the development of the biorefinery concept. In this report, ionic liquids based on 1-butyl-3-methylimidazolium cations [C4C1im]+ with Lewis basic (X = Cl−) and Brønsted acidic (X = HSO4−) anions were used to investigate the direct catalytic transformation of cellulose to HMF. Variables probed included the composition of the ionic liquid medium, the metal catalyst, and the reaction conditions (temperature, substrate concentration). Lowering the cellulose loading and optimising the temperature achieved a 58% HMF yield after only one hour at 150 °C using a 7 mol % loading of the CrCl3 catalyst. This compares favourably with current literature procedures requiring much longer reactions times or approaches that are difficult to scale such as microwave irradiation.
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Journal articleEminov S, Brandt A, Wilton-Ely JD, et al., 2016,
The Highly Selective and Near-Quantitative Conversion of Glucose to 5-Hydroxymethylfurfural Using Ionic Liquids
, PLOS One, Vol: 11, ISSN: 1932-6203A number of ionic liquids have been shown to be excellent solvents for lignocellulosic biomass processing, and some of these are particularly effective in the production of the versatile chemical building block 5-hydroxymethylfurfural (HMF). In this study, the production of HMF from the simple sugar glucose in ionic liquid media is discussed. Several aspects of the selective catalytic formation of HMF from glucose have been elucidated using metal halide salts in two distinct ionic liquids, 1-butyl-3-methylimidazolium chloride and 1-butyl-3-methylimidazolium hydrogen sulfate as well as mixtures of these, revealing key features for accelerating the desired reaction and suppressing byproduct formation. The choice of ionic liquid anion is revealed to be of particular importance, with low HMF yields in the case of hydrogen sulfate-based salts, which are reported to be effective for HMF production from fructose. The most successful system investigated in this study led to almost quantitative conversion of glucose to HMF (90% in only 30 minutes using 7 mol% catalyst loading at 120°C) in a system which is selective for the desired product, has low energy intensity and is environmentally benign.
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Journal articleCollinson J-M, Wilton-Ely JDET, Diez-Gonzalez S, 2016,
Functionalised [(NHC)Pd(allyl)Cl] complexes: Synthesis, immobilisation and application in cross-coupling and dehalogenation reactions
, Catalysis Communications, Vol: 87, Pages: 78-81, ISSN: 1566-7367A novel NHC–palladium(II) (NHC = N-heterocyclic carbene) complex and itsimmobilised version have been prepared and fully characterised. Optimisation studies led to goodcatalytic activities in Suzuki-Miyaura cross coupling and chloroarene dehalogenation reactions.Furthermore, the unexpected palladium-mediated transfer hydrogenation of a carbonyl compound isreported.
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Journal articleWilton-Ely JD, Toscani A, Marin-Hernandez C, et al., 2016,
Chromo-fluorogenic probes for carbon monoxide detection
, Chemical Communications, Vol: 52, Pages: 5902-5911, ISSN: 1364-548XThe sensing of carbon monoxide (CO) using electrochemical cells or semiconducting metal oxides has led to inexpensive alarms for the home and workplace. It is now recognised that chronic exposure to low levels of CO also poses a significant health risk. It is perhaps surprising therefore that the CO is used in cell-signalling pathways and plays a growing role in therapy. However, the selective monitoring of low levels of CO remains challenging, and it is this area that has benefited from the development of probes which give a colour or fluorescence response. This feature article covers the design of chromo-fluorogenic probes and their application to CO sensing in air, solution and in cells.
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Journal articleWilton-Ely JD, Toscani A, Brown N, et al., 2015,
Ruthenium(II) and Osmium(II) vinyl complexes as highly sensitive and selective chromogenic and fluorogenic probes for the sensing of carbon monoxide in air
, Chemistry - A European Journal, Vol: 21, Pages: 14529-14538, ISSN: 0947-6539The detection of carbon monoxide in solution and air has been achieved using simple, inexpensive systems based on the vinyl complexes [M(CH[DOUBLE BOND]CHR)Cl(CO)(BTD)(PPh3)2] (R=aryl, BTD=2,1,3-benzothiadiazole). Depending on the nature of the vinyl group, chromogenic and fluorogenic responses signalled the presence of this odourless, tasteless, invisible, and toxic gas. Solutions of the complexes in CHCl3 underwent rapid change between easily differentiated colours when exposed to air samples containing CO. More significantly, the adsorption of the complexes on silica produced colorimetric probes for the naked-eye detection of CO in the gas phase. Structural data for key species before and after the addition of CO were obtained by means of single X-ray diffraction studies. In all cases, the ruthenium and osmium vinyl complexes studied showed a highly selective response to CO with exceptionally low detection limits. Naked-eye detection of CO at concentrations as low as 5 ppb in air was achieved with the onset of toxic levels (i.e., 100 ppm), thus resulting in a remarkably clear colour change. Moreover, complexes bearing pyrenyl, naphthyl, and phenanthrenyl moieties were fluorescent, and greater sensitivities were achieved (through turn-on emission fluorescence) in the presence of CO both in solution and air. This behaviour was explored computationally using time-dependent density functional theory (TDDFT) experiments. In addition, the systems were shown to be selective for CO over all other gases tested, including water vapour and common organic solvents. Supporting the metal complexes on cellulose strips for use in an existing optoelectronic device allows numerical readings for the CO concentration to be obtained and provision of an alarm system.
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Journal articleSherwood R, Gonzàlez de Rivera F, Wan JH, et al., 2015,
Multimetallic complexes based on a diphosphine-dithiocarbamate "janus" ligand.
, Inorganic Chemistry, Vol: 54, Pages: 4222-4230, ISSN: 1520-510XThe HCl salt of the aminodiphosphine ligand HN(CH2CH2PPh2)2 reacts with [M(CO)4(pip)2] (M = Mo, W; pip = piperidine) to yield [M{κ(2)-HN(CH2CH2PPh2)2}(CO)4]. The molybdenum analogue readily loses a carbonyl ligand to form [Mo{κ(3)-HN(CH2CH2PPh2)2}(CO)3], which was structurally characterized. The same ligand backbone is used to form the new bifunctional ligand, KS2CN(CH2CH2PPh2)2, which reacts with nickel and cobalt precursors to yield [Ni{S2CN(CH2CH2PPh2)2}2] and [Co{S2CN(CH2CH2PPh2)2}3]. Addition of [AuCl(tht)] (tht = tetrahydrothiophene) to [Ni{S2CN(CH2CH2PPh2)2}2] leads to formation of the pentametallic complex, [Ni{S2CN(CH2CH2PPh2AuCl)2}2]. In contrast, addition of [PdCl2(py)2] (py = pyridine) to [Ni{S2CN(CH2CH2PPh2)2}2] does not lead to a trimetallic complex but instead yields the transmetalated cyclic compound [Pd{S2CN(CH2CH2PPh2)2}]2, which was structurally characterized. The same product is obtained directly from [PdCl2(py)2] and KS2CN(CH2CH2PPh2)2. In contrast, the same reaction with [PtCl2(NCPh)2] yields the oligomer, [Pt{S2CN(CH2CH2PPh2)2}]n. Reaction of KS2CN(CH2CH2PPh2)2 with cis-[RuCl2(dppm)2] provides [Ru{S2CN(CH2CH2PPh2)2}(dppm)2](+), which reacts with [AuCl(tht)] to yield [Ru{S2CN(CH2CH2PPh2AuCl)2}(dppm)2](+). Addition of [M(CO)4(pip)2] (M = Mo, W) to the same precursor leads to formation of the bimetallic compounds [(dppm)2Ru{S2CN(CH2CH2PPh2)2}M(CO)4](+), while treatment with [ReCl(CO)5] yields [(dppm)2Ru{S2CN(CH2CH2PPh2)2}ReCl(CO)3](+). Reaction of KS2CN(CH2CH2PPh2)2 with [Os(CH═CHC6H4Me-4)Cl(CO)(BTD)(PPh3)2] (BTD = 2,1,3-benzothiadiazole) provides [Os(CH═CHC6H4Me-4){S2CN(CH2CH2PPh2)2}(CO)(PPh3)2], but reaction with the analogous ruthenium precursor fails to yield a clean product.
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Journal articleLehner P, Staudinger C, Borisov SM, et al., 2015,
Intrinsic artefacts in optical oxygen sensors--how reliable are our measurements?
, Chemistry, Vol: 21, Pages: 3978-3986Optical oxygen sensing is of broad interest in many areas of research, such as medicine, food processing, and micro- and marine biology. The operation principle of optical oxygen sensors is well established and these sensors are routinely employed in lab and field experiments. Ultratrace oxygen sensors, which enable measurements in the sub-nanomolar region (dissolved oxygen), are becoming increasingly important. Such sensors prominently exhibit phenomena that complicate calibration and measurements. However, these phenomena are not constrained to ultratrace sensors; rather, these effects are inherent to the way optical oxygen sensors work and may influence any optical oxygen measurement when certain conditions are met. This scenario is especially true for applications that deal with high-excitation light intensities, such as microscopy and microfluidic applications. Herein, we present various effects that we could observe in our studies with ultratrace oxygen sensors and discuss the reasons for their appearance, the mechanism by which they influence measurements, and how to best reduce their impact. The phenomena discussed are oxygen photoconsumption in the sensor material; depletion of the dye ground state by high-excitation photon-flux values, which can compromise both intensity and ratiometric-based measurements; triplet-triplet annihilation; and singlet-oxygen accumulation, which affects measurements at very low oxygen concentrations.
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Journal articleToscani A, Helioevaara EK, Hena JB, et al., 2015,
Multimetallic Alkenyl Complexes Bearing Macrocyclic Dithiocarbamate Ligands
, Organometallics, Vol: 34, Pages: 494-505, ISSN: 1520-6041 -
Journal articleHurtubise VL, McArdle JM, Naeem S, et al., 2014,
Multimetallic Complexes and Functionalized Nanoparticles Based on Unsymmetrical Dithiocarbamate Ligands with Allyl and Propargyl Functionality
, INORGANIC CHEMISTRY, Vol: 53, Pages: 11740-11748, ISSN: 0020-1669- Author Web Link
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- Citations: 19
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Journal articleMoragues ME, Toscani A, Sancenon F, et al., 2014,
A Chromo-fluorogenic synthetic "Canary" for CO detection based on a Pyrenylvinyl Ruthenium(II) complex
, Journal of the American Chemical Society, Vol: 136, Pages: 11930-11933, ISSN: 0002-7863The chromo-fluorogenic detection of carbon monoxide in air has been achieved using a simple, inexpensive system based on ruthenium(II). This probe shows exceptional sensitivity and selectivity in its sensing behavior in the solid state. A color response visible to the naked eye is observed at 5 ppb of CO, and a remarkably clear color change occurs from orange to yellow at the onset of toxic CO concentrations (100 ppm) in air. Even greater sensitivity (1 ppb) can be achieved through a substantial increase in turn-on emission fluorescence in the presence of carbon monoxide, both in air and in solution. No response is observed with other gases including water vapor. Immobilization of the probe on a cellulose strip allows the system to be applied in its current form in a simple optoelectronic device to give a numerical reading and/or alarm.
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Journal articleCecchini MP, Turek VA, Demetriadou A, et al., 2014,
Heavy Metal Sensing Using Self-Assembled Nanoparticles at a Liquid–Liquid Interface
, Advanced Optical Materials -
Journal articleLin YH, Duclaux L, de Rivera FG, et al., 2014,
The Pentynoate Ligand as a Building Block for Multimetallic Systems
, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Vol: 2014, Pages: 2065-2072, ISSN: 1434-1948- Author Web Link
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- Citations: 11
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Journal articleNaeem S, Serapian SA, Toscani A, et al., 2014,
Ring-Closing Metathesis and Nanoparticle Formation Based on Diallyldithiocarbamate Complexes of Gold(I): Synthetic, Structural, and Computational Studies
, INORGANIC CHEMISTRY, Vol: 53, Pages: 2404-2416, ISSN: 0020-1669- Author Web Link
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- Citations: 32
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Journal articleSung S, Holmes H, Wainwright L, et al., 2014,
Multimetallic Complexes and Functionalized Gold Nanoparticles Based on a Combination of d- and f-Elements
, INORGANIC CHEMISTRY, Vol: 53, Pages: 1989-2005, ISSN: 0020-1669- Author Web Link
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- Citations: 30
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Journal articleEminov S, Wilton-Ely JDET, Hallett JP, 2014,
Highly selective and near-quantitative conversion of fructose to 5-hydroxymethylfurfural using mildly acidic ionic liquids
, ACS Sustainable Chemistry & Engineering, Vol: 2, Pages: 978-981, ISSN: 2168-0485 -
Journal articleNaeem S, Ribes A, White AJP, et al., 2013,
Multimetallic Complexes and Functionalized Nanoparticles Based on Oxygen- and Nitrogen-Donor Combinations
, INORGANIC CHEMISTRY, Vol: 52, Pages: 4700-4713, ISSN: 0020-1669- Author Web Link
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- Citations: 17
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Journal articleCollinson J-M, Wilton-Ely JDET, Diez-Gonzalez S, 2013,
Reusable and highly active supported copper(I)-NHC catalysts for Click chemistry
, CHEMICAL COMMUNICATIONS, Vol: 49, Pages: 11358-11360, ISSN: 1359-7345- Author Web Link
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- Citations: 79
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Journal articlePatel P, Naeem S, White AJP, et al., 2012,
Synthesis and reactivity of dialkyldithiophosphate complexes of ruthenium(II)
, RSC ADVANCES, Vol: 2, Pages: 999-1008- Author Web Link
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- Citations: 10
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Journal articleChampion MJD, Solanki R, Delaude L, et al., 2012,
Synthesis and catalytic application of palladium imidazol(in)ium-2-dithiocarboxylate complexes
, DALTON TRANSACTIONS, Vol: 41, Pages: 12386-12394, ISSN: 1477-9226- Author Web Link
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- Citations: 28
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Journal articleNaeem S, White AJP, Hogarth G, et al., 2011,
Multifunctional Dithiocarbamates: Synthesis and Ring-Closing Metathesis of Diallyldithiocarbamate Complexes (vol 29, pg 2547, 2010)
, ORGANOMETALLICS, Vol: 30, Pages: 2068-2069, ISSN: 0276-7333- Author Web Link
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- Citations: 7
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Journal articleOliver K, White AJP, Hogarth G, et al., 2011,
Multimetallic complexes of group 10 and 11 metals based on polydentate dithiocarbamate ligands
, DALTON TRANSACTIONS, Vol: 40, Pages: 5852-5864, ISSN: 1477-9226- Author Web Link
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- Citations: 50
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Journal articleNaeem S, Thompson AL, White AJP, et al., 2011,
Dithiocarboxylate complexes of ruthenium(II) and osmium(II)
, DALTON TRANSACTIONS, Vol: 40, Pages: 3737-3747, ISSN: 1477-9226- Author Web Link
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- Citations: 35
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Journal articleChia EY, Naeem S, Delaude L, et al., 2011,
Gold(I) complexes bearing mixed-donor ligands derived from N-heterocyclic carbenes
, DALTON TRANSACTIONS, Vol: 40, Pages: 6645-6658, ISSN: 1477-9226- Author Web Link
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- Citations: 16
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Journal articleAnastasiadis C, Hogarth G, Wilton-Ely JDET, 2010,
Functionalised dithiocarbamate complexes: Complexes based on indoline, indole and substituted piperazine backbones - X-ray crystal structure of [Ni(S<sub>2</sub>CNC<sub>3</sub>H<sub>6</sub>C<sub>6</sub>H<sub>4</sub>)<sub>2</sub>]
, INORGANICA CHIMICA ACTA, Vol: 363, Pages: 3222-3228, ISSN: 0020-1693- Author Web Link
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- Citations: 30
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Journal articleNaeem S, White AJP, Hogarth G, et al., 2010,
Multifunctional Dithiocarbamates: Synthesis and Ring-Closing Metathesis of Diallyldithiocarbamate Complexes
, ORGANOMETALLICS, Vol: 29, Pages: 2547-2556, ISSN: 0276-7333- Author Web Link
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- Citations: 51
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Journal articleNaeem S, Delaude L, White AJP, et al., 2010,
The Use of Imidazolium-2-dithiocarboxylates in the Formation of Gold(l) Complexes and Gold Nanoparticles
, INORGANIC CHEMISTRY, Vol: 49, Pages: 1784-1793, ISSN: 0020-1669- Author Web Link
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- Citations: 62
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Journal articleNaeem S, Ogilvie E, White AJP, et al., 2010,
The functionalisation of ruthenium(II) and osmium(II) alkenyl complexes with amine- and alkoxy-terminated dithiocarbamates
, DALTON TRANSACTIONS, Vol: 39, Pages: 4080-4089, ISSN: 1477-9226- Author Web Link
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- Citations: 28
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Journal articleChaudhry BR, Wilton-Ely JDET, Tabor AB, et al., 2010,
Effect of peptide orientation on electron transfer
, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 12, Pages: 9996-9998, ISSN: 1463-9076- Author Web Link
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- Citations: 20
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Journal articleNaeem S, Thompson AL, Delaude L, et al., 2010,
Non-innocent Behaviour of Dithiocarboxylate Ligands Based on N-Heterocyclic Carbenes
, CHEMISTRY-A EUROPEAN JOURNAL, Vol: 16, Pages: 10971-10974, ISSN: 0947-6539- Author Web Link
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- Citations: 35
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Journal articleHogarth G, Rainford-Brent E-JC-RCR, Kabir SE, et al., 2009,
Functionalised dithiocarbamate complexes: Synthesis and molecular structures of 2-diethylaminoethyl and 3-dimethylaminopropyl dithiocarbamate complexes [M{S<sub>2</sub>CN(CH<sub>2</sub>CH<sub>2</sub>NEt<sub>2</sub>)<sub>2</sub>}<i><sub>n</sub></i>] and [M{S<sub>2</sub>CN(CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>NMe<sub>2</sub>)<sub>2</sub>}<i><sub>n</sub></i>] (<i>n</i>=2, M = Ni, Cu, Zn, Pd; <i>n</i>=3, M = Co)
, INORGANICA CHIMICA ACTA, Vol: 362, Pages: 2020-2026, ISSN: 0020-1693- Author Web Link
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- Citations: 65
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