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Citation: Ruan Wen-Juan, Zhu Zhi-Ang, Chen Hong-Wei, Bu Xian-He, Zhang Zhi-Hui, Shao Ying, Chen Rong-Ti. The Visible Spectra and Electronic Effects in Axial Coordination Reaction of Zinc Porphyrin Complexes[J]. Acta Physico-Chimica Sinica, ;1997, 13(07): 603-611. doi: 10.3866/PKU.WHXB19970706 shu

The Visible Spectra and Electronic Effects in Axial Coordination Reaction of Zinc Porphyrin Complexes

1.
Department of Chemistry,Nankai Univeristy,Tianjin 300071

Received Date: 25 November 1996
Available Online: 15 July 1997

A thermodynamic study is reported for the coordination reaction of three new metal imidazolate complexes of unsymmetrical tetradentate schiff bases and four substituted imidazoles with zinc meta-substituted tetraphenylporphyrins (ZnT(m-X)PP, X=NO2, Cl, OCH3, H, CH3) in dichloromethane solvent by spectrophotometric technique. The isosbestic behavior is exhibited in the region between 450 nm and 700 nm. The equilibrium constants K at 25 ℃ were determined by the method of Rose-Dra . It was found that the stoichiometric number is unity for all 35 coordination reaction systems studied. A Hammett linear relationship exists between the ratio or equilibrium constant and the Hammett constant of substitutents on the phenyl ring of porphyrin.
- Zinc meta-substituted tetraphenylporphyrin,
- Metal schiff base,
- UV-Vis spectra,
- Axial coordination reaction,
- Equilibrium constant,
- Hammett linear relationship
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