title: Photochemistry and infrared spectrum of single-bridged diborane(5) anion isolated in solid argon.
abstract: Three-center two-electron bonds are important for understanding electron-deficient molecules. To examine such a molecule, we produced a diborane(5) anion with a single-bridged structure upon electron bombardment during matrix deposition of Ar containing a small proportion of diborane(6). The diborane(5) anion was destroyed upon photolysis at 180, 220, 385, and 450 nm, but not at 532 nm. Moreover, the possible formation of neutral diborane(5) was observed upon photolysis at 385 and 450 nm, whereas neutral diborane(3) was observed upon photolysis at 180 and 220 nm. The observed line wavenumbers, relative intensities, and isotopic ratios of the diborane(5) anion agreed satisfactorily with those predicted by density functional theory calculations at the B3LYP/aug-cc-pVTZ level of theory. Thus, this method produced the boron hydride anion of interest with few other fragments, which enabled us to clearly identify the IR spectrum of the diborane(5) anion.
authors.affiliation: National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
authors.forename: Meng-Chen
authors.initials: MC
authors.lastname: Liu
authors.affiliation: Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100, Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan.
authors.forename: Hui-Fen
authors.initials: HF
authors.lastname: Chen
authors.affiliation: Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100, Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan.
authors.forename: Wei-Jie
authors.initials: WJ
authors.lastname: Huang
authors.affiliation: National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
authors.forename: Chih-Hao
authors.initials: CH
authors.lastname: Chin
authors.affiliation: National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
authors.forename: Sian-Cong
authors.initials: SC
authors.lastname: Chen
authors.affiliation: National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
authors.forename: Tzu-Ping
authors.initials: TP
authors.lastname: Huang
authors.affiliation: National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
authors.forename: Yu-Jong
authors.initials: YJ
authors.lastname: Wu