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Viewing upcoming talks in: EaStCHEM Colloquia
RSC Award Lectures
RSC Corday Morgan Award Lecture - Solar-driven Reforming of Waste Polymers for the Synthesis of Sustainable Fuels and Chemicals
Speaker: Erwin Reisner (Cambridge)
The synthesis of solar fuels and chemicals through artificial photosynthesis allows the direct pairing of light absorption to drive chemical redox processes. This approach is a one-step and versatile alternative to the more indirect coupling of a photovoltaic cell with electrolysis and enables potentially the synthesis of a wide range of fuels and feedstock chemicals. A common drawback in most artificial photosynthetic systems and organic photocatalysis is their reliance on expensive materials and device architectures, which challenges the development of ultimately scalable devices. Another limitation in many approaches is their inefficiency and reliance on sacrificial redox reagents, which may be system damaging and often prevent truly energy-storing chemistry to proceed. This presentation will give an overview about our recent progress in developing semiconductor suspension systems to perform efficient full redox cycle solar catalysis with inexpensive components, and our approach for sustainable waste polymer (biomass and plastics) photoreforming and fine chemical synthesis.
Representative recent publications
(1) “Electro- and solar-driven fuel synthesis with first row transition metal complexes”
Dalle, Warnan, Leung, Reuillard, Karmel, Reisner, Chem. Rev., 2019, 119, 1752.
(2) “Photoreforming of lignocellulose into H2 using nanoengineered carbon nitride under benign conditions”
Kasap, Achilleos, Huang, Reisner, J. Am. Chem. Soc., 2018, 140, 11604.
(3) “Plastic waste as a feedstock for solar-driven H2 generation”
Uekert, Kuehnel, Wakerley, Reisner, Energy Environ. Sci., 2018, 11, 2853.
(4) “Solar Hydrogen Generation from Lignocellulose”
Kuehnel, Reisner, Angew. Chem. Int. Ed., 2018, 57, 3290.
(5) “Solar-driven reforming of lignocellulose to H2 with a CdS/CdOx photocatalyst”
Wakerley, Kuehnel, Orchard, Ly, Rosser, Reisner, Nature Energy, 2017, 2, 17021.
(6) “Carbon dots as photosensitisers for solar-driven catalysis”
Hutton, Martindale, Reisner, Chem. Soc. Rev., 2017, 47, 6111.
(7) “Solar-driven Reduction of Protons Coupled to Alcohol Oxidation with a Carbon Nitride-Catalyst System”
Kasap, Caputo, Martindale, Godin, Lau, Lotsch, Durrant, Reisner, J. Am. Chem. Soc., 2016, 138, 9183.
On: May 29, 2019 From: 14h00 To: 15h00View talk
Speaker: Dan Preston (Canterbury)
Complementary denticity: structurally and behaviourally complex systems from simple components D. Preston ,*,a,b G. R. Weal, b J.J. Sutton, b K.C. Gordon, b A.L. Garden, b P.E. Kruger, a and J.D. Crowley b a School of Physical and Chemical Sciences, University of Canterbury, New Zealand. b Department of Chemistry, University of Otago, New Zealand. E-mail: daniel.preston @canterbury.ac.nz Much of the current work in metallo -supramolecular chemistry is targeted towards developing behaviourally complex (i.e. switchable) systems, as well as architectures with potential for applied functions such as catalysis. We report here the self -assembly a nd molecular recognition properties of a system based around a simple 2 -(1-(pyridine -4-methyl) -1H -1,2,3 -triazol -4-yl)pyridine ligand (Figure 1). Due to self -complementary denticity at the 2 -pyridy l-1,2,3 -triazole bidentate site with square planar Pd(II) or Pt(II) metal ions , in a 2:1 ligand to metal ratio a complex with a planar cationic panel forms, that has affinity for neutral aromatic guests. 1 In a homo -metallic ligand/Pd(II) system, stoichiometry and concentration can be used to cycle between a [PdL 2]2+ complex , a [Pd 2L2]4+ dimer, and a nonanuclear [Pd 9L12]18+ cage. The equivalent nonanuclear hetero -metallic [Pd 3Pt9L12]18+ cage has also been synthesised. The Pt(II) -containing panels allow this cage to act as a photosensitizer for the production of singlet oxygen upon irradiation, resulting in the conversion of anthracenyl substrates into endoperoxides. 2
Figure 1. Cycl ing between three homo -metalllic Pd(II) species using stoichiometry and concentration/ dilution as stimuli ( left ), and a nonanuclear hetero -metallic Pd(II)/Pt(II) cage that acts as a photosensitizer for conversion of anthracenyl guests into endoperoxides i n the presence of light ( right ).
References 1 N. Kishi, M. Akita, M. Yoshizawa, Angew. Chem., Int. Ed. 2014 , 53 , 3604 -3607 2 V. Marti -Centelles, A. L. Lawrence, P. J. Lusby, J. Am. Chem. Soc. 2018 , 140 , 2862 -2868 3 Preston, D.; Findlay, J. A.; Crowley, J. D., Chem. Asian J. 2018 , ahead of print , DOI: 10.1002/asia.201801132 4 Preston, D.; Sutton, J. J.; Gordon, K. C.; Crowley, J. D., Angew. Chem. Int. Ed. 2018 , 57 , 8659 -8663. Download PDF
On: May 30, 2019 From: 14h00 To: 15h00View talk
Speaker: Christian Mueller (Freie Universität Berlin)
The Multifaceted Chemistry of Aromatic Phosphorus Heterocycles Prof. Dr. Christian Müller , Institut für Chemie und Biochemie , Freie Universität Berlin, Fabeckstr. 34 -36, 14195 Berlin, Germany http://www.bcp.fu -berlin.de/ak -mueller ; c.mueller@fu -berlin.de Low -coordinate phosphorus(III) compounds have recently re -gained noticeable interest as the very peculiar stereoelectronic and coordination proper ties of such λ 3σ2-species differ significantly from classical trivalent λ 3σ3-phosphanes. These special characteristics can lead to interesting effects in more applied research fields, such as homogeneous catalysis and material science. We recently found a facile synthetic access to the Si(CH 3)3-substituted phosphinine I, from which the parent phosphinine C 5H5P ( II) can be prepared by means of protodesilylation reaction (Figure 1). [1.2] Interestingly we noticed, that the Si(CH 3)3-group in β -position of the phosphorus atom has a significant influence on the electronic properties of I, which can be attributed to the β -silyl effect. It turned out, that Si(CH 3)3-substituted phosphinines show a distinct reactivity towards certain main group elements and main group compounds. For instance, we could prepare and characterize for the first time hitherto unknown phosphinine -selenides ( III). DFT calculations are in agreement with an increased nucleophilicity and basicity of the phosphorus ato m in II. Accordingly, a considerable increase in the gas phase basicities of various Si(CH 3)3-substituted phosphinines was noticed. Figure 1.
Novel 32-phosphinines with a particular substitution pattern could be prepared , which can even activate stro ng O -H and N -H bonds under formation of the corresponding λ 5-phosphinines ( IV). Our recent results open up the opportunity to develop a new chemistry for phosphinines, complementary to the one of already established systems.
References:  M. H. Habicht, F. Wossidlo, M. Weber, C. Müller, Chem. Eur. J. 2016 , 22 , 12877 -12883.  M. H. Habicht, F. Wossidlo, T. Bens, E. A. Pidko, C. Müller, Chem. Eur. J. 2018 , 24 , 944 -952. Download PDF
On: June 6, 2019 From: 15h00 To: 16h00View talk
RSC Award Lectures
RSC Soft Matter and Biophysical Chemistry Award Lecture - Materials Chemistry to Mimic Living Matter
Speaker: Prof Samuel Stupp (Northwestern University)
Materials Chemistry to Mimic Living Matter Samuel I. Stupp Departments of Chemistry, Materials Science & Engineering, Medicine, and Biomedical Engineering Simpson Querrey Institute for Bio -Inspired Science and Technologies Northwestern University
One of the grand challenges in materials chemistry is the search for synthetic supramolecular systems that could mimic the behaviors of living matter . Advances in this frontier could yield materials that impact health , energy, and environment al protection technologies. The design of molecular motions and the discovery of mechanisms for reversible formation of structure, particularly hierarchical ones, are of fundamental importance in this area. A remarkable biological example is the dynamic formation and di sassembly of supramolecular polymers in the cytoskeleton of cells. Ideally such biomimetic reversible behavior in synthetic soft matter would occur at constant temperature through the addition of chemicals or the use of other external stimuli. This lecture will report on the development of biomolecular systems that mimic protein ligands to signal cells or organize reversibly into superstructures upon addition of molecules . Of relevance to energy and the environ ment, the lecture will also discuss photocatalytic synthetic systems inspired by the photosynthetic machinery of green plants, and others that respond to light or magnetic fields to acquire robotic functions . Download PDF
On: June 11, 2019 From: 14h00 To: 15h00View talk