[ks1]

I was wondering how would you increase conjugation of Dibenzalacetone to increase it's UV characteristics thereby increasing its Sunscreen role

[Honclbrif]

Increasing conjugation is as simple as adding more alternating single and double bonds.

However, remember your particle in a box: increasing conjugation redshifts absorption. If it gets too long it will begin absorbing in the visual range, which wouldn't make a very good sunscreen, would it?

What other physical parameter would it be advantageous to modify to make a better sunscreen? Hint: think Beer's Law...

[ks1]

molar absorptivity???

[Honclbrif]

If you were using a sunscreen, would you want one with a longer absorption wavelength, or a higher molar absorptivity?

[ks1]

The increase in conjugation makes it easier for electrons to jump to a higher energy level hence longer wavelength of light to be absorbed and transmitted

Thanks