TY - JOUR
AU - D'yachkovskii, F.
AB - 


1.

It was found that protonation of H2TPP and H2TMPP by trifluoroacetic acid in benzene takes place according to the following scheme for concentrations of TFA of 10−5–10−6 mole/liter

$$H_2 P + \xrightarrow[{(K_1 )}]{{ + TFA}}H_3 P^ +   \cdot A^ -  \xrightarrow[{(K_2 )}]{{ + TFA}}H_4 P^{2 + }  \cdot 2A^ -  $$

 and in contrast to polar solvents, the ratio of the constants is K2/K1 > 1.



2.

The values of the equilibrium constants obtained indicate that H2TPP, H2TMPP, and H2TAPP are relatively convenient for determination of trace amounts (≤10−5 mole/liter) of strong Brönsted acids in nonpolar media. The selection of the type of porphyrin base is dependent on the strength and concentration of the acid.




TI - Determination of trace amounts of Brönsted acids in nonpolar media with porphyrin bases. 1. Protonation of meso-substituted porphyrins with trifluoroacetic acid in benzene
JO - Russian Chemical Bulletin
DO - 10.1007/BF00978422
DA - 2004-12-29
UR - https://www.deepdyve.com/lp/springer-journals/determination-of-trace-amounts-of-br-nsted-acids-in-nonpolar-media-i6HJhsi1Z0
SP - 1376
EP - 1382
VL - 38
IS - 7
DP - DeepDyve
ER -