No abstract

In this study, novel 1,3-substituted phenyl-5-phenylformazans were synthesized with eNO 2 , eCl, eBr, eCH 3 , eOCH 3 groups in the o-, m-, and p-position of the 1-phenyl ring and eNO 2 , eOCH 3 groups in the m-and p-position of the 3-phenyl ring. Their structures were elucidated by elemental analysis and GCemass and their spectral behaviors were investigated with 1 H NMR, 13 C NMR, IR, UVevis spectra. The absorption characteristics of the compounds were examined by UVevis spectra. There was a shift in l max whose amount was dependent upon the type and position of the substituent on the ring. A linear correlation was obtained between this substituent effect and Hammett substituent coefficients.

No abstract

No abstract

1-[(NO 2 , COOH)-substituted phenyl]-3,5-diphenylformazans were synthesized. The compounds were characterized by infrared (IR), ultraviolet-visible (UV-vis), 1 H nuclear magnetic resonance (NMR), 13 C NMR spectra, elemental analysis, and cyclic voltammetry. From the UV-vis spectra of substituted formazans it was seen that k max values were shorter than the k max value of unsubstituted formazan. It was observed that the shift values were dependent on the type and position of the substituents. A correlation between Hammett substituent coefficients and k max values was obtained. The oxidation peak potentials of substituted formazans were found more anodic than that of unsubstituted formazan. The oxidation mechanism was a single step for the NO 2 -substituted formazans, and two steps for COOH-substituted formazans.