Download Inorganic Chemistry Presentation

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)