Abstract
Abstract Liquid molecular solar thermal fuels containing m-bisazobenzene units are newly developed. Efficient E-Z photoisomerization was observed both in solutions and in neat liquids, with the thermal stability of Z isomers comparable to those of azobenzene derivatives. The heat storage capacities of liquid m-bisazobenzenes (230–262 J/g) are larger than that previously reported for a liquid azobenzene solar thermal fuel (168 J/g). This work provides a new design guideline for enhancing gravimetric energy density in condensed molecular solar thermal fuels.
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