engineering spec. molecule

[eagleone]

I'm interested in engeeniring molecule with specific max. e-m wave apsorption. How to, where from to start ?
eg. Like one used for blocking UV rays (btw do you have formulas of these molecules).

[Chemicalsuperfreak]

Try a poly conjugated enone. Look up the Woodward rules for UV spectroscopy. He's got all the functional groups laid out in a nice table.