Property variation of ionic liquid BmimAuCl4 immobilized on carboxylated polystyrene submicrospheres with a small surface areaReportar como inadecuado




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Chinese Science Bulletin

, Volume 58, Issue 24, pp 2950–2955

First Online: 20 May 2013Received: 25 January 2013Accepted: 18 March 2013DOI: 10.1007-s11434-013-5845-8

Cite this article as: He, Y., Fu, H., Li, C. et al. Chin. Sci. Bull. 2013 58: 2950. doi:10.1007-s11434-013-5845-8

Abstract

In order to understand the effect of surface chemical groups on the immobilized species, Au-containing imidazolium-based ionic liquid IL BmimAuCl4 was intentionally immobilized on polystyrene PS submicrospheres d ∼300 nm with a very small surface area 4–10 m-g, which possess carboxyl-moiety COONa or COOH on the surface. The behavior of immobilized BmimAuCl4 on the two types of submicrospheres was investigated by transmission electron microscopy TEM, differential scanning calorimetry DSC, and powder X-ray diffraction XRD. It was revealed that the melting points Tm of BmimAuCl4 that had been immobilized on PS-COONa and PS-COOH submicrospheres were decreased by 2.7 and 4.1°C, respectively. The interaction mechanism between the IL and submicrosphere surface moieties was further analyzed by X-ray absorption fine structure XAFS analysis. The data indicated that the coordination environment of Au species changed markedly when Bmim AuCl4 was immobilized on the surfaces of PS-COONa and PS-COOH submicrospheres, as illustrated by the decrease in white line peak intensity. The effect of surface COOH groups on Tm depression and the white line peak intensity of the XANES spectrum is more pronounced than that of COONa groups, most likely due to the possible hydrogen bond formation between the COOH group and Bmim.

Keywordsionic liquid polystyrene submicrospheres immobilization phase behavior XAFS This article is published with open access at Springerlink.com

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Autor: YaXing He - HaiYing Fu - Cheng Li - Xiang Ji - XueWu Ge - Yang Zou - Zheng Jiang - HongJie Xu - GuoZhong Wu

Fuente: https://link.springer.com/







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