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Generation of Phosphonium Sites on Sulfated Zirconium Oxide: Relationship to Brønsted Acid Strength of Surface –OH Sites
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-01-09 , DOI: 10.1021/jacs.8b13204
Jessica Rodriguez 1 , Damien B. Culver 1 , Matthew P. Conley 1
Affiliation  

The reaction of (tBu)2ArP (1a-h), where the para position of the Ar group contains electron-donating or electron-withdrawing groups, with sulfated zirconium oxide partially dehydroxylated at 300 °C (SZO300) forms [(tBu)2ArPH][SZO300] (2a-h). The equilibrium binding constants of 1a-h to SZO300 are related to the p Ka of [(tBu)2ArPH]; R3P that form less acidic phosphoniums (high p Ka values) bind stronger to SZO300 than R3P that form more acidic phosphoniums (low p Ka values). These studies show that Brønsted acid sites on the surface of SZO300 are not superacidic.

中文翻译:

硫酸化氧化锆上鏻位点的生成:与表面 –OH 位点的布朗斯台德酸强度的关系

(tBu)2ArP (1a-h),其中 Ar 基团的对位含有给电子或吸电子基团,与在 300 °C 下部分脱羟基的硫酸化氧化锆 (SZO300) 的反应形成 [(tBu)2ArPH ][SZO300] (2a-h)。1a-h 与 SZO300 的平衡结合常数与 [(tBu)2ArPH] 的 p Ka 相关;形成酸性较低的鏻(高 p Ka 值)的 R3P 与 SZO300 的结合比形成更多酸性鏻(低 p Ka 值)的 R3P 更强。这些研究表明 SZO300 表面的布朗斯台德酸位不是超酸性的。
更新日期:2019-01-09
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