From Chalmers web
One molecule stores solar energy and becomes the key element in an emissions-free energy system that saves heat from the summer sun for winter.
This is the result of a research group from Chalmers University of Technology, Sweden.
Around a year ago, the research team presented a molecule that was capable of storing solar energy. The molecule, made from carbon, hydrogen and nitrogen, has the unique property that when it is hit by sunlight, it is transformed into an energy-rich isomer – a molecule which consists of the same atoms, but bound together in a different way.