Ethynylene‐Linked 1,2‐Dihydro‐1,2‐Azaborinines With High Energy Densities for Efficient Molecular Solar Thermal Energy Storage

Molecular solar thermal energy storage (MOST) systems offer an approach to harnessing solar energy by converting, storing, and releasing it within chemical bonds. This study introduces ethynylene‐linked 1,2‐dihydro‐1,2‐azaborinines as highly promising candidates for MOST systems, exhibiting exceptional energy densities and extended storage times. With an outstanding energy density of 1229 kJ/kg, a half‐life exceeding 36 days, and an absorption onset wavelength of 350 nm, these dihydroazaborinines satisfy the key criteria for optimal MOST performance. Their remarkable properties make them a highly promising basis for developing materials capable of efficiently converting and storing solar energy.