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Investigation on the Trioctylphosphine Oxide-Based Super-Concentrated HCl System

Investigation on the Trioctylphosphine Oxide-Based Super-Concentrated HCl System

Ran Guo, Lin Guo, Kun Huang, Anqi He, Jin Zhang, Lirong Zheng, Yi Liu, Tingguo Kang, Xiuxiang Gao, Shifu Weng, Ying Zhao, Zhanlan Yang, Yizhuang Xu, Isao Noda, Jinguang Wu

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Feb 5;136 Pt B:288-94.

PMID: 25448932

Abstract:

We report a new super-concentrated HCl system prepared by using trioctylphosphine oxide (TOPO)-based reverse micelles. The observed molar ratio between acid and water (nHCl/nH2O) in the super-concentrated HCl are much higher than that in the saturated aqueous HCl solution (0.28). Moreover, FT-IR spectroscopic results reveal that a significant amount of HCl remains in the molecular form rather than being ionized into H(+) and Cl(-). As a result, two H-Cl stretching bands can be observed in the FT-IR spectrum. The super-concentrated HCl provides a unique chemical environment in which many chemical substances occur in unusual states. For example, the color of super-concentrated HCl solution containing copper ion was found to be reddish brown rather than green as in conventional state. UV-Vis-NIR spectral results indicate that both d-d transition band of Cu(2+) and charge transfer band of Cl-Cu in super-concentrated HCl underwent significant variation. Additionally, copper ions bring about remarkable variation on the hydrogen bond network among HCl in the super-concentrated HCl solution as demonstrated by FT-IR spectra. According to the EXAFS results, we suggest that copper ion may occur as HCuCl3 in the super-concentrated HCl.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP78502	Trioctylphosphine oxide		78-50-2	Price

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