It was determined that the diprotonated form of 2,8,12,18-tetramethyl-3,7,13,17-tetrabutyl- H 21, H 23-porphine ( H 4III2+) acts as a bromide selective receptor. It forms stable complexes H 4III2+( CH 3 CN )( Br −) ( log K d1 = 5.50 ± 0.03), H 4III2+( Br −)2 ( log K d2 = 3.25 ± 0.03) in the system H 2III-( Et )4 NBr - HClO 4-acetonitrile at 25°C. Spectrophotometric method allows to determine the bromide ions' concentration 3 × 10−8 M−1.

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