Acidity of HCl in Neutral Buffered Chloroaluminate Molten Salts
Acidity of HCl in Neutral Buffered Chloroaluminate Molten Salts
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DOI：
10.1021/ja961935b
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发表时间：
1996-11
影响因子：
15
通讯作者：
D. King;R. Mantz;R. Osteryoung
中科院分区：
文献类型：
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作者：
D. King;R. Mantz;R. Osteryoung
比较了中性缓冲AlCl3：1-乙基-3-甲基咪唑氯化铵(EMIC)熔体中HCl的Bronsted酸度和酸性(55mol%AlCl3)熔体中HCl的Bronsted酸度。用分光光度指示剂法比较酸度。用芳烃作为弱指示剂碱。中性缓冲熔体中HCl的酸度既取决于缓冲剂的类型(LiCl、KCl和NaC l)，也取决于熔体中金属阳离子的浓度。在中性缓冲熔体中观察到HCl的Bronsted酸度增加，尽管程度比在酸性熔体中要小。测定了氯化钠(最初为55mol%AlCl3)缓冲熔体和氯化锂(最初为55mol%AlCl3)缓冲熔体的Hammett酸度函数。对于HCl(1atm)/NaC l/AlCl3：Mic(最初为55mol%AlCl3)缓冲熔体，Ho=−11.3.HO=−12.7，适用于HCl(1atm)/LiCl3/AlCl3：Mic(最初为55mol%AlCl3)缓冲熔体。
The Bronsted acidity of HCl in neutral buffered AlCl3:1-ethyl-3-methylimidazolium chloride (EMIC) melts has been compared to the Bronsted acidity of HCl in acidic (55 mol % AlCl3) melts. The acidities were compared using the spectrophotometric indicator method. Arenes were used as the weak indicator bases. The acidity of HCl in the neutral buffered melts was found to be dependent on both the type of buffering agent (LiCl, KCl, and NaCl) and on the concentration of the metal cation in the melt. An enhancement in Bronsted acidity of HCl is observed in the neutral buffered melts, although to a lesser degree than that in the acidic melts. A Hammett acidity function was determined for a NaCl (originally 55 mol % AlCl3) buffered melt and a LiCl (originally 55 mol % AlCl3) buffered melt. For a HCl (1 atm)/NaCl/AlCl3:EMIC (originally 55 mol % AlCl3) buffered melt, Ho = −11.3. Ho = −12.7 for a HCl (1 atm)/LiCl/AlCl3:EMIC (originally 55 mol % AlCl3) buffered melt.