Relating alkaline stability to the structure of quaternary phosphonium cations. Issue 47 (25th July 2018)

• Record Type: Journal Article
• Authors: Zhang, Bingzi; Long, Hai; Kaspar, Robert B.; Wang, Junhua; Gu, Shuang; Zhuang, Zhongbin; Pivovar, Bryan; Yan, Yushan
• Is Part Of: RSC advances. Volume 8:Issue 47(2018)
• Page Start: 26640
• Page End: 26645
• Publication Date: 2018-07-25
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra03440k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A semi-empirical formula based on the Taft equation is established to directly estimate alkaline stability of quaternary phosphonium (QP) cations from the 31 P NMR chemical shift δ and the steric substituent constant E s . Abstract : Alkali-stable quaternary phosphonium (QP) is a type of cationic group for hydroxide exchange membranes (HEMs). To elucidate the relationship between structure and alkaline stability, we investigated the kinetics and degradation mechanism of a series of QP cations by both experiment and computation, and established a semi-empirical formula based on the Taft equation to directly estimate alkaline stability of QP cations from the 31 P NMR chemical shift δ and the steric substituent constant E s, facilitating the search for QP cations with improved alkaline stability.