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The redox potentials of 4,4Ã¢Â€Â™-dimethyl-NÃ¢Â€Â™NÃ¢Â€Â™-alkylidene bridged 2,2Ã¢Â€Â™-bipyridinium salts derivatives (DBPAs) can be controlled by changing the N, NÃ¢Â€Â™-alkylidene bridge length which changes the conformation of the DBPAs.. In this paper, the torsional angles between the two pyridine rings and the molecular energy of DBPAs are calculated using a PC based software package (AccuModel 1.2). The relationship between torsional angle and N, NÃ¢Â€Â™-alkylidene bridge length is discussed. The molecular energy of DBPAs can also be related to the torsional angles (or N, NÃ¢Â€Â™-alkylidene bridge size). Some DBPAs had been synthesized and their redox potentials measured. The difference in potential between ethylene and propylene bridged DBPAs is large enough to make a organic diode through bilayer modified electrode

The Relationship between Redox Potentials and Torsional Angles in 4,4’-Dimethyl N, N’-Alkylidene 2,2’-Bipyridinium Salts