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Inorganic Faculty with Research Interests Presentation to 2/c Chemistry Majors January 30, 2017 Assoc. Prof. Wayne Pearson My research interests lie in the development of new protocols to improve accuracy in XRF and SCXRD analyses. Project 1: Development of a System of Scaling Factors to Improve Quantitative Analysis in XRF studies Project 2: Application of Radial Form Factors to Improve Refinements of X-ray Crystal Structures. Assoc. Prof. Amy MacArthur Research interests: • development of inexpensive catalysts (Co, Cu, and Ni) to replace traditional, expensive Pd, Pt, Rh, and Ir catalysts • development of catalytic reactions with two catalysts operating simultaneously in solution (tandem catalysis) Qualifies for biochem concentration! Hydrodehalogenation of ArCl Cyanation of ArCl Cannon, K. A.; Geuther, M. E.; Kelly, C. K.; Lin, S.; MacArthur, A. H. R. Organometallics 2011, 30 (15), 4067-4073 Coughlin, M. M.; Kelly, C. K.; Lin, S.; MacArthur, A. H. R. Organometallics 2013, 32 (12), 3537-3543 Assoc. Prof. Joseph F. Lomax • Collaboration with the National Gallery of Art and Dr. Suzanne Q. Lomax • Investigating historical and novel modern organic pigments •Synthesis • Analytical • IR and Raman • NMR • MALDI • Research project or Capstone • Collaboration with Prof. Peter Brereton, Physics Department • Synthesis of ‘monolayer’ transition metal dichalcogenides • Similar to graphene, monolayer graphite • Potential optical computer components • Interactions with organic bases • Occurs in layered transition metal dichalcogenides • May give insight into the intercalation reaction Assoc. Prof. William Heuer Overview: Synthetic Inorganic chemistry. (1) Preparation & study of metal complexes with novel photophysical and redox properties. Tools: NMR, IR, UV-Vis, CV, Luminescence, MALDI-MS, XRD (with Prof. Pearson). DFT calculations? (2) Preparation, ligand exchange reactions & applications of semiconductor quantum dots (collaboration with groups at NRL and NSWC Indian Head. Ru-Ni complex – surprising photochemical reaction Photochemical reaction observed for complex with estersubstituted bpy ligands on Ru but not for bpy analogue: start 10 min 10 min 1 42 min 52 min 0.6 65 min 32 min absorbance absorbance 32 min 0.8 20 min 0.8 20 min Sarah Duffy USNA ’11 start 1 1.2 42 min 0.6 52 min 65 min 0.4 76 min 76 min 0.4 0.2 0.2 0 UV-Vis spectrum of the bimetallic complex is not simply the sum of the parts: 220 2+ 2+ NC S S N S S (deeb)2Ru (M-1cm-1) 60000 e 80000 40000 N S N S S P N S S N S S P Ph Ph P Ni Ni (deeb)2Ru NC 1b Ph Ph Ph S 2b P Ph Ph Ph 0 325 375 425 475 525 wavelength, nm Possible mechanism involves ET from ligand bridge to the diesterbpy ligands (?) 520 wavelength, nm 620 720 3 • Prepare analogues with other metals (e.g. Cu or Pt) at the sulfur site. • Electronic structure? 20000 275 420 Given that the spectra of the two complexes are so similar, why do they react so differently? 100000 N 320 575 625 675 0 220 320 420 520 wavelength, nm 620 720 Another approach: Possible route to more robust bimetallic complexes? Doyoung Lee ’14 Unsymmetrical, cationic bis-chelate Pt(II) complexes Structure: assignment of 1H peaks using 2-D NMR (COSY, HMQC) and chloro-substitution: Delano Martins ’14 Nate McLauchlan ‘16 UV-Vis and Emission: Electronic Structure: Aggregation: conc.-dependent chemical shifts in 1H NMR spectrum: X-ray crystallography: • Crystal growth & X-ray • Aggregation studies • Investigate interaction with DNA? Semiconductor Nanocrystals (“Quantum Dots”) •Synthesis and ligand-exchange reactions of soluble colloidal semiconductor QD’s and development of solution-based methods for fabrication of superlattice films, LED’s and thin-film solar cells. Nanocrystal superlattice films: Credit: Kovalenko research group Applications: Light-emitting diode (LED): Solar cell: Credit: Fafarman research group Credit: Shirasaki, et. al. Nature Photonics 7, 13–23 (2013)