Abstract
Interactions of cationic tetrakis (N, N´, N´´, N´´´- tetramethyltetra-3, 4-pyridinoporphyrazinatozinc (II) [Zn (tmtppa)] with various anionic micelles of surfactants n- alkyl sulfonate and sulfate (n=11, 12, 14) have been investigated spectrophotometrically at 25 ◦ C in premicellar and postmicellar region. The results have shown that with increasing the alkyl chain length of surfactants, the maximum absorbance of Zn (tmtppa) shifted to a higher wavelength and binding affinity of Zn (tmtppa) to anionic micelles increases. This confirms that the surfactant micelle, which has a longer alkyl hydrocarbon chain, enables greater solubilization of porphyrazine. Thus, the hydrophobic interaction of the porphyrazine with micelles increases in the order: C 11 H 23 SO 3 Na < C 12 H 25 SO 4 Na < C 14 H 29 SO 3 Na..
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