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  • Journal article
    Albrecht T, Inkpen MS, Lemmer M, Fitzpatrick N, Costa-Milan D, Nichols RJ, Long NJet al., 2015,

    New insights into single-molecule junctions using a robust, unsupervised approach to data collection and analysis

    , Journal of the American Chemical Society, ISSN: 1520-5126
  • Software
    Inkpen M, Lemmer M, Fitzpatrick N, Costa-Milan D, Nichols RJ, Long NJ, Albrecht Tet al., 2015,

    Macro Scheduler code for data collection

    Supporting information associated with the publication "New insights into single-molecule junctions using a robust, unsupervised approach to data collection and analysis", J. Am. Chem. Soc., 2015, DOI: 10.1021/jacs.5b05693. This Macro Scheduler (MJT Net Ltd, UK) script is a representative example of that used to automatically measure I(s) traces from 1,8-ODT-coated and blank (uncoated) Au substrates using an Agilent 5100 Scanning Tunnelling Microscope (interfacing with PicoView 1.14, Agilent Technologies). A short 'Guide to...' document is also included to introduce the user, as are additional files (Microsoft Excel spreadsheets and images) required by the script.
  • Software
    Inkpen MS, Lemmer M, Fitzpatrick N, Costa-Milan D, Nichols RJ, Long NJ, Albrecht Tet al., 2015,

    MATLAB script for data sorting

    Supporting information associated with the publication "New insights into single-molecule junctions using a robust, unsupervised approach to data collection and analysis", J. Am. Chem. Soc., 2015, DOI: 10.1021/jacs.5b05693. This MATLAB script is a representative example of that used to objectively sort I(s) traces obtained from 1,8-ODT-coated and blank (uncoated) Au substrates. A short 'Guide to...' document is also included to introduce the user.
  • Journal article
    Phanopoulos A, Miller PW, Long NJ, 2015,

    Beyond Triphos - New hinges for a classical chelating ligand

    , Coordination Chemistry Reviews, Vol: 299, Pages: 39-60, ISSN: 1873-3840

    Branched triphosphine ligands have been less widely studied than mono- and bi-dentate analogues. The most studied ligand of this type is TriphosPh (CH3C(CH2PPh2)3). Substitution of the apical Csingle bondCH3 moiety with boron, silicon, tin, nitrogen or phosphorus fragments has generated a new family of ligands, in some cases displaying varying coordination chemistry and reactivity to the parent carbon-based system. This review includes the synthetic strategies implemented to afford these ligands, as well as derivatives by way of varying the phosphine substituents. Although not exhaustive, relevant types of reported complexes featuring these ligands are discussed, as well as their reactivity and catalytic applications. Through critical analysis, common themes and chemical trends across this family of apical heteroatomic, branched triphosphines can be identified, leading to improvements in current chemical applications, as well as new areas that remain underdeveloped.
  • Journal article
    Phanopoulos A, White AJ, Long NJ, Miller PWet al., 2015,

    Catalytic transformation of levulinic acid to 2-methyltetrahydrofuran using ruthenium–N-triphos complexes

    , ACS Catalysis, Vol: 5, Pages: 2500-2512, ISSN: 2155-5435

    A series of pre- or in situ-formed ruthenium complexes were assessed for the stepwise catalytic hydrogenation of levulinic acid (LA) to 2-methyltetrahydrofuran (2-MTHF) via γ-valerolactone (γVL) and 1,4-pentanediol (1,4-PDO). Two different catalytic systems based on the branched triphosphine ligands Triphos (CH3C(CH2PPh2)3) and N-triphos (N(CH2PPh2)3) were investigated. The most active catalyst was the preformed ruthenium species [RuH2(PPh3){N(CH2PPh2)3-κ3P}] (5), which gave near quantitative conversion of LA to 1,4-PDO when no acidic additives were present, and 87% 2-MTHF when used in conjunction with HN(Tf)2. Various acidic additives were assessed to promote the final transformation of 1,4-PDO to 2-MTHF; however, only HN(Tf)2 was found to be effective, and NH4PF6 and para-toluenesulfonic acid (p-TsOH) were found to be detrimental. Mechanistic investigations were carried out to explain the observed catalytic trends and importantly showed that PPh3 dissociation from 5 resulted in its improved catalytic reactivity. The presence of acidic additives removes catalytically necessary hydride ligands and may also compete with the substrate for binding to the catalytic metal center, explaining why only an acid with a noncoordinating conjugate base was effective. Crystals suitable for X-ray diffraction experiments were grown for two complexes: [Ru(NCMe)3{N(CH2PPh2)3-κ3P}] (14) and [Ru2(μ-Cl)3{N(CH2PPh2)3-κ3P}2][BPh4] (16).
  • Journal article
    Phanopoulos A, Long N, Miller P, 2015,

    The Synthesis, Characterization and Reactivity of a Series of Ruthenium <i>N</i>-triphos<SUP>Ph</SUP> Complexes

    , JOVE-JOURNAL OF VISUALIZED EXPERIMENTS, ISSN: 1940-087X
  • Journal article
    Stasiuk GJ, Minuzzi F, Sae-Heng M, Rivas C, Juretschke H-P, Piemonti L, Allegrini PR, Laurent D, Duckworth AR, Beeby A, Rutter GA, Long NJet al., 2015,

    Dual-Modal Magnetic Resonance/Fluorescent Zinc Probes for Pancreatic beta-Cell Mass Imaging

    , Chemistry-A European Journal, Vol: 21, Pages: 5023-5033, ISSN: 1521-3765

    : Despite the contribution of changes in pancreaticb-cell mass to the development of all forms of diabetes mellitus,few robust approaches currently exist to monitor thesechanges prospectively in vivo. Although magnetic-resonanceimaging (MRI) provides a potentially useful technique, targetingMRI-active probes to the b cell has proved challenging.Zinc ions are highly concentrated in the secretory granule,but they are relatively less abundant in the exocrinepancreas and in other tissues. We have therefore developedfunctional dual-modal probes based on transition-metal chelatescapable of binding zinc. The first of these, Gd·1, bindsZnII directly by means of an amidoquinoline moiety (AQA),thus causing a large ratiometric Stokes shift in the fluorescencefrom lem =410 to 500 nm with an increase in relaxivityfrom r1=4.2 up to 4.9 mm1 s1. The probe is efficiently accumulatedinto secretory granules in b-cell-derived lines andisolated islets, but more poorly by non-endocrine cells, andleads to a reduction in T1 in human islets. In vivo murinestudies of Gd·1 have shown accumulation of the probe inthe pancreas with increased signal intensity over 140 minutes.
  • Journal article
    Edwards P, Krebs B, Raithby P, Long N, Cheetham A, Schroder Met al., 2015,

    The new chemistry of the elements Introduction

    , PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 373, ISSN: 1364-503X
  • Journal article
    Edwards PP, Krebs B, Long NJ, Raithby PRet al., 2015,

    Dedication to Lord Lewis: the new chemistry of the elements

    , PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 373, ISSN: 1364-503X
  • Journal article
    Bakewell C, Fateh-Iravani G, Beh D, Myers D, Tabthong S, Hormnirun P, White AJ, Long N, Williams CKet al., 2015,

    Comparing a series of 8-quinolinolato complexes of aluminium, titanium and zinc as initiators for the ring-opening polymerization of rac-lactide.

    , Dalton Transactions, Vol: 44, ISSN: 1477-9226

    The preparation and characterization of a series of 8-hydroxyquinoline ligands and their complexes with Ti(iv), Al(iii) and Zn(ii) centres is presented. The complexes are characterized using NMR spectroscopy, elemental analysis and, in some cases, by single crystal X-ray diffraction experiments. The complexes are compared as initiators for the ring-opening polymerization of racemic-lactide; all the complexes show moderate/good rates and high levels of polymerization control. In the case of the titanium or aluminium complexes, moderate iso-selectivity is observed (Pi = 0.75), whereas in the case of the zinc complexes, moderate hetero-selectivity is observed (Ps = 0.70).
  • Journal article
    Bakewell C, White AJP, Long NJ, Williams CKet al., 2015,

    Scandium and Yttrium Phosphasalen Complexes as Initiators for Ring-Opening Polymerization of Cyclic Esters

    , Inorganic Chemistry, Vol: 54, Pages: 2204-2212, ISSN: 1520-510X
  • Journal article
    Neri G, Walsh JJ, Wilson C, Reynal A, Lim JYC, Li X, White AJP, Long NJ, Durrant JR, Cowan AJet al., 2015,

    A functionalised nickel cyclam catalyst for CO<sub>2</sub> reduction: electrocatalysis, semiconductor surface immobilisation and light-driven electron transfer

    , PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 17, Pages: 1562-1566, ISSN: 1463-9076
    • Cite
    • Citations: 59
  • Journal article
    Stasiuk GJ, Holloway PM, Rivas C, Trigg W, Luthra SK, Iveson VM, Gavins FNE, Long NJet al., 2015,

    <SUP>99m</SUP>Tc SPECT imaging agent based on cFLFLFK for the detection of FPR1 in inflammation

    , DALTON TRANSACTIONS, Vol: 44, Pages: 4986-4993, ISSN: 1477-9226
  • Journal article
    Rivas C, Stasiuk GJ, Sae-Heng M, Long NJet al., 2015,

    Towards understanding the design of dual-modal MR/fluorescent probes to sense zinc ions

    , DALTON TRANSACTIONS, Vol: 44, Pages: 4976-4985, ISSN: 1477-9226
  • Journal article
    Duerrbeck A, Gorelik S, Hobley J, Wu J, Hor A, Long Net al., 2015,

    Highly emissive, solution-processable and dynamic Eu(III)-containing coordination polymers

    , CHEMICAL COMMUNICATIONS, Vol: 51, Pages: 8656-8659, ISSN: 1359-7345

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Professor Nick Long
Email: n.long@imperial.ac.uk
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