个人简介

B.Sc. - York University Ph.D. - University of British Columbia

研究领域

Inorganic Chemistry Coordination and Organometallic Chemistry

Organometallic and Inorganic Chemistry supramolecular coordination polymers, magnetic materials, open-shell organometallics, actinide chemistry, metal-metal bonds Compounds which contain unpaired electrons can be found throughout chemistry, from the active sites in many proteins to magnetic materials. The variety of spin carriers is impressive: such systems can involve transition metals, lanthanides and organic radicals. We are interested in all aspects of paramagnetic molecules, in particular focusing on the areas of advanced molecular magnetic materials and paramagnetic organometallic complexes. Molecular Magnetic Materials are a new type of magnetic material composed of molecules rather than metal atoms. This fundamental difference allows us to create types of advanced materials that have 'radically' different properties compared to classical magnets. For example, molecular magnetic materials can be dissolved. They can be highly coloured or transparent. Imagine a luminescent magnet, a chiral magnet or magnetic polymers! These long-term goals have applications in the electronics and computer industries as information storage and display components, as sensors and as molecular switches. We are also very active in the general synthesis and characterization of paramagnetic metal-containing coordination polymers for other applications that target luminescent, non-linear optical and zeolitic (porous) properties. Paramagnetic Organometallic Complexes have been much less studied relative to the vast literature on diamagnetic organometallic complexes. We are interested in the synthesis, structural chemistry, reactivity and magnetic behaviour of this underexamined class of organometallics. To what extent does the presence of unpaired electrons at the metal centre affect the stability, structure and reactivity of these compounds? Reactivity studies in particular with respect to catalysis and redox chemistry are explored. Current Research Programs: Transition-Metal and Lanthanide-Based Supramolecular Coordination Polymers Using combinations of paramagnetic transition metals, lanthanides and appropriate bridging ligands, we are pursuing novel molecular magnetic materials. Bridging ligands include metal-cyanides and phenylenes. In particular, the use of linear d10 metal cyanides such as [Au(CN)2]- that display strongly attractive metal-metal interactions are under investigation. The fundamental interactions between unpaired electrons are also examined. Paramagnetic Transition-Metal Organometallics The examination of paramagnetic (a) high-valent transition metal organometallics, (b) early/late heterobimetallic and (c) mixed-valent complexes are of particular interest. Ligand design and synthesis is an inherent part of this project. Actinide Chemistry As an extension of our research in both supramolecular coordination chemistry and paramagnetic organometallics, the chemistry of uranium complexes with a variety of ligand systems, from oxidation state +3 to +6 is explored. Actinides are relatively underexamined compared with their transition-metal counterparts and provide an exciting route into some unusual chemistry. Spin Crossover Complexes for Molecular Electronics Compounds which exhibit high/low spin transitions are synthesized and their magnetic and optical properties studied with respect to understanding and controlling the transition. The design of molecule-based information storage systems, switches and sensors is envisioned. Graduate students who join my group will gain experience in a wide range of techniques including multinuclear NMR (and NMR of paramagnetic complexes), ESR, FTIR, UV-vis kinetics, cyclic voltammetry and thermogravimetric analysis. They are also exposed to a variety of magnetic measurement methods, including the use of a state-of-the-art SQUID magnetometer. The determination of solid state structures by X-ray crystallography plays a crucial role in this research and we routinely collect diffraction data and solve our own crystal structures. Students will be trained in the synthesis and manipulation of air and moisture-sensitive compounds using vacuum-line/Schlenk techniques and a state-of-the-art glovebox system.

近期论文

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Herasymchuk, K.; Chiang, L.; Hayes, C. E.; Brown, M. L.; Ovens, J. S.; Patrick, B. O.; Leznoff, D. B.; Storr, T., "Synthesis and electronic structure determination of uranium(VI) ligand radical complexes", Dalton Trans., 2016, 12576-12586 Download 108. Ovens, J. S.; Christensen, P. R.; Leznoff, D. B., "Designing tunable white-light emission from an aurophilic CuI/AuI coordination polymer with thioether ligands", Chem. Eur. J. 2016, 8234-8239 Download 107. Roberts, R. J.; Ahern, J. C.; Patterson, H. H.; Leznoff, D. B., "Ce/Au(CN)2--based coordination polymers containing and lacking aurophilic interactions", Eur. J. Inorg. Chem., 2016, 13-14, 2082-2087 Download 106. Pick, F. S.; Thompson, J. R.; Savard, D. S.; Leznoff, D. B.; Fryzuk, M. D., "Synthesis of iron and cobalt complexes of a ferrocene-linked diphosphinoamide ligand and characterization of a weak iron-cobalt interaction", Inorg. Chem. 2016, 4059-4067 Download 105. Thompson, J. R.; Goodman-Rendall, K. A. S.; Leznoff, D. B., "Birefringent, emissive cyanometallate-based coordination polymer materials containing group(II) metal-terpyridine building blocks", Polyhedron 2016, 108, 93-99 Download 104. Featured on the front cover of Chemical Communications, Issue 76, 2015 Download Roberts, R. J.; Le, D.; Leznoff, D. B. "Controlling intermolecular aurophilicity in emissive dinuclear Au(I) materials and their luminescent response to ammonia vapour", Chem. Commun., 2015, 14299-14302 103. Yoshida, T.; Zhou, W.; Furuyama, T.; Leznoff, D. B.; Kobayashi, N., "An extremely air-stable 19π porphyrinoid", J. Am. Chem. Soc. 2015, 9258-9261 Download 102. Zhou, W.; Platel, R. H.; Tasso, T. T.; Furuyama, H.; Kobayashi, N.; Leznoff, D. B., "Reducing zirconium(IV) phthalocyanines and the structure of a Pc4-Zr complex", Dalton Trans. 2015, 13955-13961 Download 101. Thompson, J. R.; Katz, M. J.; Williams, V. E.; Leznoff, D. B., "Structural design parameters for highly birefringent coordination polymers", Inorg. Chem. 2015, 6462-6471 Download 100. Poirier, S.; Roberts, R. J.; Le, D.; Leznoff, D. B.; Reber, C., "Interpreting effects of structure variations induced by temperature and pressure on luminescence spectra of platinum(II) bis(dithiocarbamate) compounds", Inorg. Chem. 2015, 3728-3735 Download 99. Platel, R. H.; Tasso, T. T.; Zhou, W.; Furuyama, T.; Kobayashi, N.; Leznoff, D. B., "Metallophthalocyanin-ocenes: scandium phthalocyanines with an η5-bound Cp ring", Chem. Commun. 2015, 5986-5989 Download 98. Ovens, J. S.; Leznoff, D. B., "Raman detected sensing of volatile organic compounds by vapochromic Cu[AuX2(CN)2]2 (X = Cl, Br) coordination polymer materials", Chem. Mater. 2015, 1465-1478 Download 97. Jelier, B. J.; Howell, J. L.; Montgomery, C. D.; Leznoff, D. B.; Friesen, C. M., "A convenient route to tetraalkylammonium perfluoroalkoxides from hydrofluoroethers", Angew. Chem. Intl. Ed. 2015, 2945-2949 Download 96. Savard, D. S.; Leznoff, D. B., "Magnetostructural characterization of copper(II) hydroxide dimers and coordination polymers coordinated to apical isothiocyanate and cyanide-based counteranions", Can. J. Chem. 2014, 1021-2030 Download 95. Leznoff, D. B., "Professor Alfred B. P. (Barry) Lever TRIBUTE", Can. J. Chem. 2014, vii-viii Download 94. Hayes, C. E.; Gill, D. E.; Brown, M. L.; Leznoff, D. B., "Mixed-donor amido-siloxo actinide(IV) halide and alkyl complexes with an aryl C-ipso interaction", Eur. J. Inorg. Chem. 2014, 3690-3700 Download 93. Ahern, J. C.; Roberts, R. J.; Follansbee, P.; McLaughlin, J.; Leznoff, D. B.; Patterson, H. H., "Structure and emissive properties of heterobimetallic Ln-Au coordination polymers: role of Tb and Eu in non-aurophilic [nBu4N]2[Ln(NO3)4Au(CN)2] versus aurophilic Ln[Au(CN)2]3•3H2O/3D2O chains", Inorg. Chem. 2014, 7571-7579 Download 92. Hayes, C. E.; Leznoff, D. B. "Actinide coordination and organometallic complexes with multidentate polyamido ligands", Coord. Chem. Rev., 2014, 155-170 Download 91. Featured on the back cover of Chemical Communications, Issue 50, 2014 Download Roberts, R. J.; Belanger-Desmarais, N.; Reber, C.; Leznoff, D. B. "The luminescence properties of linear vs. kinked aurophilic 1-D chains of bis(dithiocarbamato)gold(I) dimers", Chem. Commun., 2014, 3148-3150 90. Thompson, J. R.; Roberts, R. J.; Williams, V. E.; Leznoff, D. B. "Birefringent, emissive coordination polymers incorporating bis(benzimidazole)pyridine as an anisotropic building block", CrystEngComm, 2013, 9387-9393