Pressure-induced transformations in diborane: a Raman spectroscopic study.

摘要: As a classical electron-deficient molecule with unique hydrogen bridge bonding, diborane has created considerable interest in the structural chemistry. We report here first evidence of pressure-induced transformations probed by situ Raman spectroscopy. At pressures around 4 GPa, undergoes liquid-solid phase transformation to new high-pressure I possible structure similar low-temperature phase. When compressed above 6 spectral features, such as doubling lattice modes, appearance several internal and emergence ring stretch mode, indicate another II. This extended network higher hydrides borane. 14 transforms yet III. All observed are completely reversible upon decompression.