TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Diamino naphthalene of formula (2) and trichloro acetic acid chloride are reacted to obtain 2,2'-binaphtho imidazole type compoundR1-R6=same as defined above.Preferred Process: Alternately, diamino naphthalene and trichloro acetic acid are reacted to obtain 2,2'-binaphtho imidazole type compound. EXAMPLE - 2,3-diamino naphthalene (in g) (1.9) was dissolved in tetrahydrofuran (THF) (100 ml), and THF solution of trichloro acetic acid chloride (1.75) was added. Sodium carbonate aqueous solution (200 ml) and ethyl acetate (200 ml) were added to the obtained mixture and liquid separated after stirring for 3 hours at room temperature. The organic layer was dried and 2,3-diamino naphthalene (1.9) and THF (100 ml) were added to the obtained solid. The mixture was heat-refluxed and triethyl amine (7.29) was added. The obtained mixture was heat-refluxed, concentrated and liquid separated by adding ethyl acetate and water. The organic layer was concentrated and crude crystals of 1H, 1'H-(2,2')bi(naphtho(2,3-d)imidazolyl) (0.44) were obtained. The obtained crystals were washed with 2-methoxy ethanol and 1H, 1'H-(2,2')bi(naphtho(2,3-d)imidazolyl) (140 mg) was obtained as yellow powder. The obtained compound (120 mg), rubidium bipyridyl chloro complex (157 mg) and ethylene glycol (10 ml) were refluxed for 5 minutes. Distilled water (10 ml) was added and the insoluble substance was filter-separated. The obtained mixture was dissolved in water and ammonium hexafluorophosphate (200 mg) was added. The obtained precipitate was filtered, washed with distilled water and diethyl ether to obtain reddish brown fine particles of rubidium hexafluoro phosphate complex containing 1H, 1'H-(2,2')bi(naphtho(2,3-d)imidazolyl). The obtained complex was added to 28% sodium methoxide, refluxed, washed with cold methanol and diethyl ether, and dried under reduced pressure, to obtain rubidium bisbipyridyl binaphtho imidazolium complex (205 mg) as yellowish brown fine particles.