One-Dimensional BeH<sub>2</sub> Polymers: Infrared Spectra and Theoretical Calculations
作者:Xuefeng Wang、Lester Andrews
DOI:10.1021/ic048464b
日期:2005.2.1
neon to form BeH2 and (BeH2)2, which are identified through isotopic substitution and DFT calculations. Unreacted Be atoms isolated in solid neon or hydrogen are excited to the 1P0 state and react further with H2 to enhance the BeH2 and (BeH2)2 concentrations and produce (BeH2)n polymers. The series of strong infrared-active parallel Be-H-Be bridge-bond stretching modes observed for (BeH2)n polymers
Reactions of beryllium atoms with hydrogen. Matrix infrared spectra of novel product molecules
作者:Thomas J. Tague、Lester Andrews
DOI:10.1021/ja00078a057
日期:1993.12
Beryllium atoms formed by pulsed laser ablation have been codeposited with gaseous mixtures of hydrogen diluted in argon (concentrations varied from 25:1 to 100:1) onto a substrate at 10 K. Infrared spectroscopy on the reaction mixture identified six novel product molecules-BeH, BeH2, BeBeH, HBeBH, HBeHBeH, and HBe(H)2-BeH. Assignments of infrared absorption bands were made on the basis of broad-band photolysis and annealing behavior, isotopic substitutions, and ab initio calculations performed at the MBPT(2) level. The major products initially are BeH (1970.0 cm-1) and the previously unobserved BeH2 molecule (upsilon3 = 2159.1 cm-1, upsilon2 = 697.9 cm-1) with formation of the three dimers HBeBeH, HBeHBeH, and HBe(H)2BeH at the expense of the initial reaction products upon annealing of the matrix to 30 K. The former dimer involves a stable Be-Be bond, and the latter dimers incorporate bridging hydrogen atoms. The new Be2H molecule (2013.7, 540.0 cm-1) is a minor product in these experiments, which exhibits a stronger Be-Be bond than Be2.