A series of liquid and photoliquefiable azobenzene (Azo)
derivatives
(Azo-Cn-Br) have been synthesized for molecular solar
thermal fuels. Each of the liquid and photoliquefiable azo derivatives
shows a high degree of isomerization, a fast isomerization rate, a
long half-life, an appropriate energy storage density, and a solvent-free
“charging” and “discharging” process.
The photoliquefied azo derivatives can isomerize upon UV light irradiation
at low temperatures to give the “UV-charged” azo ones.
Therefore, the phase transition enthalpy is stored simultaneously
along with the isomerization enthalpy. The “UV-charged”
azo derivatives are capable of releasing heat under the manipulation
of blue light.
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