Optical absorption and conductimetric studies on ionic dissociation of metallotetraphenylporphyrins in ethanol solutions.
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概要
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Optical absorption spectra of chloro[tetraphenylporphyrinato(2-)]metals, M<SUP>III</SUP>Cl(tpp) (M=Mn, Fe, Co, and In), and diacetato[tetraphenylporphyrinato(2-)]tin(IV), Sn<SUP>IV</SUP>(CH<SUB>3</SUB>COO)<SUB>2</SUB>(tpp), in ethanol and benzene solutions were measured. A marked difference in the absorption spectra between the ethanol and benzene solutions was observed for M<SUP>III</SUP>Cl(tpp), Fe<SUP>III</SUP>Cl(tpp), and Co<SUP>III</SUP>Cl(tpp), while a small difference for In<SUP>III</SUP>Cl(tpp) and Sn<SUP>IV</SUP>(CH<SUB>3</SUB>COO)<SUB>2</SUB>(tpp). The electric conductivity measurements demonstrated that M<SUP>III</SUP>Cl(tpp) (M=Mn, Fe, Co, and In) undergoes ionic dissociation in ethanol, whereas Sn<SUP>IV</SUP>(CH<SUB>3</SUB>COO)<SUB>2</SUB>(tpp) does not. Solvent effects on the optical absorption spectra observed for ethanol and benzene solutions of the metallotetraphenylporphyrins are discussed on the basis of (1) the ionic dissociation revealed from the conductivity measurements and (2) charge-transfer (from porphyrin ligand to the central metal) character of the electronic absorption bands.
- 公益社団法人 日本化学会の論文
著者
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Hoshino Mikio
The Institute Of Physical And Chemical Research
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Yamamoto Kiyoko
The Institute of Physical and Chemical Research
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Katayama Shunzo
The Institute of Physical and Chemical Research
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