Aromatic poly(pyridinium salt)s: synthesis and structure of organo-soluble, rigid-rod poly(pyridinium tetrafluoroborate)s

Search for a One-Electron Reduction of the Cation Radical of an Extended Viologen , p-Phenylene-bis-4,4'-(1-Aryl-2,6-Diphenylpyridinium)

“…This two-electron recduction follows from the slope of the log-plot analysis of the second wave (33 mV/decade, given in Figure 1B) and from the potential difference of cathodic and anodic voltammetric peaks (33 mV). Spectral observations confirm that the single mechanism including only reactions [1] and [2] cannot be right. The observation of initially red and then blue color during an exhaustive electrolysis or in spectroelectrochemical cell, and especially the results of pulse radiolysis and EPR measurements 5 leave no doubt that primary redox product 1 +• , produced at E 0 1 is red and that the blue compound absorbing at 614 nm is a product of its subsequent transformation.…”

“…Polymers based on the extended viologen unit 1 2+ have been known for some time (1)(2)(3) and the first five oligomers have been prepared recently (4).…”

Synthesis and characterization of poly(pyridinium salt)s with oxyalkylene units exhibiting amphotropic liquid–crystalline and photoluminescence properties

“…The solubilities of the synthesized polymers I-1eI-3 and II-1eII-3 in various organic both polar and nonpolar solvents were examined revealing that their solubilities in several organic solvents were increased significantly as opposed to the poly(pyridinium salt)s with inorganic tetrafluoroborate counterions (Table 2) [41,42]. The organic tosylate and triflimide counterions reduce the electrostatic interactions between the pyridinium ions present in the polymer chain and the counterions due to their significant delocalization of polarizable electron clouds.…”

Hyperbranched Poly[bis(alkylene)pyridinium]s

“…These polymers are generally insoluble in water but soluble to a limited extent in polar aprotic solvents. [6,8] Their solubility, thermal stability as well as miscellaneous properties have been studied after counterion modification [2,3] and after incorporation of oxyalkylene moieties, [2] of alkyl or aromatic spacers, [4] of stilbenyl side groups or of pdistyrylbenzene segments in the main chain. [5] Several groups [9][10][11] studied the synthesis of poly(4-chloropyridine) and poly(4-bromopyridine) by the Menschutkin reaction.…”