Related Experiment Video
Updated: Jan 20, 2026
Bond Energies, Bond Lengths and Multiplicity
Identification of cyc-B3H3 with Three Bridging B-H-B Bonds in a Six-Membered Ring
Sheng-Lung Chou1, Jen-Iu Lo1, Yu-Chain Peng1
1National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
Abstract:
Irradiation of samples of diborane(6), B2H6 and B2D6, separately and together, dispersed in solid neon near 4 K with tunable far-ultraviolet light from a synchrotron yielded new infrared absorption lines that are assigned to several carriers. Besides H, B, BH, BH2, BH3, B2, B2H2, and B2H4, previously identified, a further species is assigned on the basis of quantum-chemical calculations of vibrational wavenumbers and intensities to be cyc-B3H3 (D 3 , singlet state) in several isotopic variants, which feature three bridging B-H-B bonds in a six-membered ring.
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