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Featured Images from Penn Chemistry Researchers

molecule
Walsh Group
Polymeric [K3(THF)2(BINOLate)3Yb]n, a precatalyst, was synthesized by Dr. Alfred Wooten of the Walsh group. This beautiful and distinct structure has a 6-fold screw axis and exhibits intramonomer (3.27-3.66 Å) and intermonomer (3.02-3.37 Å) K-C π-interactions that hold the monomeric units together.
molecule
Rappe Group
Titanium encapsulated in an octahedron of oxygen.This image can be used to describe ferroelectricity, showing the ferroelectric effect. This image is courtesy of the research group of Prof. Andrew Rappe
molecule
Rappe Group
A three-dimensional contour plot that maps out polarization of lead titanate. Image courtesy of the research group of Prof. Andrew Rappe
molecule
Rappe Group
The highest occupied molecular orbital (HOMO) of nickel-substituted lead titanate solid solution. The square-planar environment of nickel is stabilized by an oxygen vacancy, which leads to a ferroelectric with a decreased band gap. Image courtesy of the research group of Prof. Andrew Rappe
molecule
Rappe Group
The lowest unoccupied molecular orbital (LUMO) of nickel-substituted lead titanate solid solution. Image courtesy of the research group of Prof. Andrew Rappe
molecule
X-Ray Facility
Result of the structure determination of cobalt octabromotetramesityl porphyrin complex. Porphyrins are important sub-units in biological molecules like hemoglobin as well a being interesting catalysts for oxygen fixation.
molecule
Kozlowski Group
Cercosporin, a member of the perylenequinone natural products. The chromophore of the perylenequinones permits their use in photodynamic therapy, and they are known to be both potent and specific PKC inhibitors. The key steps in the first total synthesis of cercosporin involve an asymmetric biaryl coupling and copper-mediated epoxide openings.
molecule
X-Ray Facility
Structure of a Xenon atom trapped in a cryptophane cage. These kinds of molecules are being developed in the Dmochowski lab as MRI probes for biological systems.
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