Geraskina, Margarita R. published the artcileThe Viologen Cation Radical Pimer: A Case of Dispersion-Driven Bonding, SDS of cas: 47369-00-6, the publication is Angewandte Chemie, International Edition (2017), 56(32), 9435-9439, database is CAplus and MEDLINE.
The π bonds between organic radicals have generated excitement as an orthogonal interaction for designing self-assembling architectures in water. A systematic investigation of the effect of the viologen cation radical structure on the strength and nature of the pimer bond is provided. A striking and unexpected feature of this π bond is that the bond strength is unchanged by substitution with electron-donating groups or withdrawing groups or with increased conjugation. Furthermore, the interaction is undiminished by sterically bulky N-alkyl groups. Theor. modeling indicates that strong dispersion forces dominate the interaction between the radicals, rationalizing the insensitivity of the bonding interaction to substituents: the stacking of polarizable π radicals leads to attractive dispersion forces in excess of typical dispersion interactions of small mols. and helps overcome the Coulombic repulsion of bringing two cationic species into contact.
Angewandte Chemie, International Edition published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, SDS of cas: 47369-00-6.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem