Self-Assembly of 3-[4'-(Diethylboryl) phenyl] pyridine and 3-[3'-(Diethylboryl) phenyl] pyridine: Synthesis, Structural Features, and Stability in Solution
The self-assembly of 3-[4'-(diethylboryl) phenyl] pyridine (3) and 3-[3'-(diethylboryl) phenyl] pyridine (4) was investigated by 1H and 11B NMR spectroscopies and vapor pressure osmometry. It can be seen that in solution 3 affords an equilibrium mixture of oligomers including a cyclic trimer as a major component via intermolecular boron-nitrogen coordination bonds, which is supported by temperature-, concentration-, and solvent- ...