Series of Protonated Nitrogen Bases with a Weakly Coordinating Counteranion: Observation of the 14N-1H Spin-Spin Coupling

Maria C Carrasco; Firoz Shah Tuglak Khan; Shabnam Hematian

doi:10.1021/acsorginorgau.3c00045

Series of Protonated Nitrogen Bases with a Weakly Coordinating Counteranion: Observation of the ¹⁴N-¹H Spin-Spin Coupling

ACS Org Inorg Au. 2023 Oct 20;4(1):91-96. doi: 10.1021/acsorginorgau.3c00045. eCollection 2024 Feb 7.

Authors

Maria C Carrasco¹, Firoz Shah Tuglak Khan¹, Shabnam Hematian¹

Affiliation

¹ Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States.

Abstract

A distinguished triplet splitting pattern for the ¹⁴N-¹H couplings in the proton signals of a series of protonated nitrogen bases-aliphatic and aromatic amines, as well as pyridines-with the weakly coordinating tetrakis(pentafluorophenyl)borate anion, [B(C₆F₅)₄]^-, is observed for the first time in nonaqueous media at room temperature. The effects of ion pairing, solvent parameters, and correlation between the δ_H, ¹J_NH, and pK_a values are reported.