226. Physical properties and chemical constitution. Part XXXV. The electric dipole moments of some phenanthrolines and bipyridyls

Abstract

The electric dipole moments of three phenanthrolines, four bipyridyls, and 2,2'-biquinolyl have been calculated from measurements of the dielectric constants, specific volumes, and refractive indices of their solutions in pure benzene a t 25.00". They are discussed in terms of the dipole moments expected by the vector addition of the moments of two pyridine molecules and of the interaction between them.

Effect of molecular structure on infrared spectra of six isomers of bipyridine

“…The moments were calculated for planar structures in both cis and trans configurations, for the three isomers (2,2'-, 3,3'-, 2,3'bipyridine) in which such forms are feasible. Experimentally determined moments agreed well with theoretical values, but were not available for the 2,3'-and 3,3'-isomers (5,6). The intensity of the inter-ring stretching vibration reflects the magnitude of change in dipole moment as the vibration is carried out.…”

Bipyridinophane‐containing conjugated polymers modulated with an intramolecular aromatic CH/π interaction

“…P7 and P10 exhibited no response to the addition of alkali‐metal ions or alkaline‐earth‐metal ions in the absorption or fluorescent spectra. This phenomenon was also observed for 2,2′‐bipyridyl‐containing poly(phenylenevinylene)13 and polyfluorene4 and could be attributed to the poor coordination of the alkali and alkaline‐earth metals with the 2,2′‐bipyridyl unit 32…”

A bipyridine-containing water-soluble conjugated polymer: Highly efficient fluorescence chemosensor for convenient transition metal ion detection in aqueous solution

“…The spectral response of 2,2 0 -dipyridyl-containing conjugated polymers to metal ions was believed to be based on the chelation between the 2,2-bipyridyl units and the metal ions. Chelating with the metal ions forced the bipyridyl group, which had a 208 dihedral angle between two pyridine planes to become more planar and thus resulted in an increased effective conjunction length on the entire polymer [16]. We thus considered that the difference of absorption maximum (Dl max ) shifts arisen from the different coordination capability of metal ions to the 2,2-bipyridyl units, i.e.…”