Ml. Yang et al., Mechanism of the interaction of color reagent 1,3-N, N '-bis-4-(4 '-nitro benzenediazo) phenyl squaraine with oxoacid anions, SCI CHINA B, 42(1), 1999, pp. 70-76
By AM1 method, the interactions between 1, 3-N, N'-Bis-4-(4'-nitro benzened
iazo) phenyl squaraine (BNBPS) and several oxoacid anions have been studied
on the basis of the proposed model. The mechanism of the color reactions i
s suggested and the answers to the question of whether or not BNBPS colorat
es with HCO3-, CO32-, NO2 - , NO3 - , etc. are given. It is theoretically p
redicted that BNBPS might be used as the color reagent for SO42-.