A New Visualization Tool for Chemical BondsDong-Kyun Seo (Arizona State University) DMR 0239837

Covalent and ionic bonds are two of the fundamental glues that bind atoms to form molecules and solids. Certainly, different elements form bonds differently, which is why they provide all distinct chemical and physical characteristics to their compounds.

We have shown that a mathematical function called RED (Relative Entropy Density) can visually differentiate chemical bonds among different atoms.

For example, RED shows how different the covalent bonds can be among Group 14 elements despite the fact that they all have classical two-center two-electron bonds (Figure).

RED function will be an essential tool in studies of properties of complicated metal alloys and intermetallics in materials research.

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Easy Synthesis of Quantum Dots in Undergrad. Labs

Dong-Kyun Seo (Arizona State University) DMR 0239837

Colloidal quantum dots, especially the ones consisting of Groups 12 and 16 elements, are one of the most studied materials in the area of nanoscience and nanotechnology because of their quantum confinement effect.

Based on our recent development of a new facile synthetic method for the materials, our undergraduate students now can synthesize highly fluorescent quantum dots in the Inorganic Chemistry Lab course and experience state-of-the-art materials research.

The synthesis can be carried out at lower temperatures without a need of refluxing apparatus.