Wolfram, the maker of Mathematica, has a new online tool that provides an amazing amount of data on materials and chemicals that can be used as a handy reference tool. The tool is called Mathematica Alpha. You can enter queries like:

• Carbon, Si, P
• density Ag, Au
• elements semiconductor
• ferromagnetic elements
• Anthracene
• Pentacene 3D structure
• Fe3O4
• Streptavidin
• DNA

The image below is an example output from the tool and is the 3D structure of Pentacene. Pentacene is a p-type organic semiconductor with a bandgap of around 1.8eV. You can also use the tool to evaluate equations. It's a very powerful online tool.



I would like to point out the Mathematica is also available for students (spectacular value $140), and there is a home version of all you closet mathematicians (you know who you/we are for $295). The full version is $2495.