A colored pyridoinium borate complex was written by Roth, H. J.;Al Sarraj, S.. And the article was included in Archiv der Pharmazie und Berichte der Deutschen Pharmazeutischen Gesellschaft in 1966.Electric Literature of C7H6N2 This article mentions the following:
Boric acid reacts with 1,2-bis(N-methyl-4-pyridinium)glycol diiodide in basic solution to give a pyridoinium chelate which is oxidized by air to give I. I is red in the solid state and yellow in solution In the experiment, the researchers used many compounds, for example, 4-Methylpicolinonitrile (cas: 1620-76-4Electric Literature of C7H6N2).
4-Methylpicolinonitrile (cas: 1620-76-4) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Electric Literature of C7H6N2