An 15N NMR study of the protonation of two di-(alpha-pyridyl) compounds in solutions and the solid state.
15N NMR data are reported for two Di-(alpha-pyridyl) derivatives in various stages of protonation. A combination of 15N NMR measurements taken, on a number of solutions, and on the solid state provide a quantitative overall view of the progress of protonation of these compounds. 15N shieldings, J(15N-1H) and 2J (15N-1H) interactions all provide information indicative of unsymmetrical monoprotonation in the solid state and producing both the monoprotonated [N-H-N]+ structure and the diprotonated structure in the presence of an excess of TFA.
Klimkiewicz
J
J
Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw, Poland.
Stefaniak
L
L
Grech
E
E
Webb
G A
GA
Wawer
I
I
D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D009587:Nitrogen Isotopes; D011522:Protons; D011725:Pyridines / Q000737:chemistry*; D011810:Quinoxalines / Q000737:chemistry*; D012996:Solutions
C104773:2,3-dipyridyl-6,7-dimethylquinoxaline; D009587:Nitrogen Isotopes; D011522:Protons; D011725:Pyridines; D011810:Quinoxalines; D012996:Solutions