McNamara Louis, Waldron Abigail, Thomas Michael, Jones Willis, O'Rourke Patrick, Darrell Simmons, Strange Fessler K Alicia
Savannah River National Laboratory, 301 Gateway Drive, Aiken, 29803, SC, USA.
University of North Florida, 1 UNF Drive, Jacksonville, FL, 32224, USA.
Phys Chem Chem Phys. 2023 Jan 27;25(4):2990-2998. doi: 10.1039/d2cp04147b.
Molybdenum hexafluoride (MoF) is used as a non-radioactive substitute for uranium to study the hydrolysis of metal hexafluorides. Molybdenum hexafluoride gas and water vapor, from the air, were sequentially layered onto a diamond substrate kept at liquid nitrogen temperature using a custom designed cryogenic cell with a copper cold finger. Reaction progress was monitored by transmission Fourier Transform Infrared Spectroscopy (FTIR) through the layers and diamond substrate over several hours while allowing the substrate to warm. Changes in the modes in the 500-1000 cm region are tracked as the reaction progresses in order to identify intermediate species. Strong absorption features are also observed in the 1000-3000 cm range, suggesting the presence of ionic dissociation intermediates trapped in a disordered H-bonded network of cryogenic hydrofluoric acid. A possible reaction pathway is proposed and the final hydrolysis product is characterized by FTIR, UV-vis, and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS).
六氟化钼（MoF）被用作铀的非放射性替代品，以研究金属六氟化物的水解。使用带有铜冷指的定制低温池，将来自空气中的六氟化钼气体和水蒸气依次分层沉积到保持在液氮温度的金刚石基底上。在让基底升温的过程中，通过透射傅里叶变换红外光谱（FTIR）对穿过各层和金刚石基底的反应进程进行了数小时的监测。随着反应的进行，追踪500 - 1000厘米区域内模式的变化，以识别中间物种。在1000 - 3000厘米范围内也观察到强烈的吸收特征，这表明在低温氢氟酸的无序氢键网络中存在被困的离子解离中间体。提出了一种可能的反应途径，并通过FTIR、紫外可见光谱和扫描电子显微镜/能量色散X射线光谱（SEM/EDS）对最终水解产物进行了表征。
