There is an interesting editorial by Roald Hoffmann, What, Another Nobel Prize in Chemistry to a Nonchemist? in the latest issue in Angewandte Chemie International.
Hoffmann, thoughtfully argues that chemists should not be upset [some are] that the chemistry prize seems to be increasingly awarded to people from outside chemistry departments [esp. biochemistry and molecular biology, but also physics and materials science].
He also asks the interesting question: will a chemist ever win the Nobel Prize in physics? He argues that Bednorz and Muller who discovered superconductivity in cuprate compounds might be considered chemists. I don't buy that. Their education, employment, and publications were clearly in the physics.
I welcome possible answers to Hoffmann's question.
My answer might be: in principle, yes; but in practice no. I think this may be partly because of the arrogant reductionism of influential parts of the physics community.
Possible areas impacting physics and to which chemists make important contributions include synthesis of new materials with exotic ground states, single molecule electronics, single molecule spectroscopy, glasses, ....
I thank Seth Olsen for bringing the article to my attention.