Equilibria of imidazole derivatives with (protoporphyrin IX dimethyl ester)iron(III) chloride.

スポンサーリンク

概要

• 論文の詳細を見る

• The equilibria of sterically hindered and unhindered imidazoles (B) with (protoporphyrin IX dimethyl ester)iron(III) chloride (Fe(PPDME)Cl) have been spectrophotometrically investigated in chloroform and 1,2-dichloroethane. The addition reaction of hindered imidazole with Fe(PPDME)Cl proceeds in two steps to give Fe(PPDME)B<SUB>2</SUB>Cl, with a formation constant, <I>K</I><SUB>1</SUB>, greater than <I>K</I><SUB>2</SUB>. The mono-adduct of hindered imidazoles exhibits an absorption band at around 590 nm, which shifts to longer wavelengths as the formation constant <I>K</I><SUB>1</SUB> decreases in this order; 2,4-dimethyl->2-methyl->2-ethyl->2-phenyl->1,2-dimethylimidazole. The addition reaction of an unhindered imidazole with Fe(PPDME)Cl proceeds in an apparent one step to give Fe(PPDME)B<SUB>2</SUB>Cl, with an overall formation constant of β<SUB>2</SUB>. The logβ<SUB>2</SUB> linearly increases with the basicity, p<I>K</I><SUB>a</SUB>(BH<SUP>+</SUP>), of unhindered imidazoles. The logβ<SUB>2</SUB> for the system with NH-containing imidazoles is greater than that for the system with <I>N</I>-substituted imidazoles by about 3.1 log units, on the average, based on the stabilization of the positive charge on iron(III) through NH…Cl hydrogen bonding. The solvent effect on the formation constants is also discussed.

• 公益社団法人 日本化学会の論文

著者

• Yoshimura Tetsuhiko

  The Environmental Science Institute Of Hyogo Prefecture

• Ozaki Tomio

  The Environmental Science Institute of Hyogo Prefecture

関連論文

• EPR DETECTION AND CHARACTERIZATION OF MANGANOUS (II) ION IN ORGANS-SUBCELLULAR FRACTIONS OF THE LIVER AND KIDNEY AND THYROID HOMOGENATE OF MICE TREATED WITH MANGANESE CHLORIDE
• Nitrosyl(protoporphyrin IX dimethyl ester)iron(II) complexes with nitrogenous bases. The basicity dependence of the NO stretching frequency.
• Effect of sodium dodecyl sulfate on spectral properties of five- and six-coordinate nitrosyl(protoporphyrin IX dimethyl esterato)iron(II) complexes.
• Substituent effects on the electronic absorption and MCD spectra of five- and six-coordinate nitrosyl(tetraphenylporphyrinato)iron(II) complexes.
• The nitrogen oxide complex of the iron(II) protoporphyrin IX dimethyl ester.
• Equilibria of imidazole derivatives with (protoporphyrin IX dimethyl ester)iron(III) chloride.

スポンサーリンク