NaB(OH)3CH3: a deep-ultraviolet optical crystal with unprecedented methyl-modified [B(OH)3CH3] units

Non-π-conjugated [B(OH) 3 CH 3 ] units as novel deep-ultraviolet (DUV) building blocks are found by the intrinsic modification of the tetrahedron, and the first methyl borate DUV optical crystal, NaB(OH) 3 CH 3 , is successfully synthesized.