Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Apr 5;123:385-91. doi: 10.1016/j.saa.2013.12.022. Epub 2013 Dec 17.
The benefit of near infrared (NIR) spectroscopy to follow the adsorption of dimethylsulfoxide and acetonitrile on reduced-charge Cu-montmorillonites differing in their chemical composition is presented. A NIR UpDRIFT accessory enabling measurement of spectra directly in closed glass vials was used to determine the amounts of adsorbed solvents. The area of the complex 2νCH band correlated very well with gravimetric analysis confirming that the UpDRIFT technique is suitable for studies of total content of organic solvents adsorbed on montmorillonites. Changes of the 2νOH band revealed that acetonitrile with a lower dipole moment (DP) and Gutmann donor number (GDN) fully solvated all samples heated up to 200°C and only partially those heated at 300°C, while DMSO with a higher DP and GDN completely solvated all the samples. These results indicate that fixation of Cu(2+) cations in montmorillonites upon heating is a partially reversible process.
本文介绍了近红外（NIR）光谱在跟踪二甲基亚砜和乙腈在电荷降低的铜蒙脱石上吸附的应用，这些蒙脱石在化学成分上存在差异。使用一种能够在封闭玻璃小瓶中直接测量光谱的 NIR UpDRIFT 附件来确定吸附溶剂的量。2νCH 带的面积与重量分析非常吻合，证实了 UpDRIFT 技术适用于研究蒙脱石上吸附的有机溶剂的总量。2νOH 带的变化表明，偶极矩（DP）和古特曼给体数（GDN）较低的乙腈完全溶剂化了所有加热至 200°C 的样品，仅部分溶剂化了加热至 300°C 的样品，而 DP 和 GDN 较高的 DMSO 则完全溶剂化了所有样品。这些结果表明，铜（2+）阳离子在蒙脱石上的固定是一个部分可逆的过程。
