Paramagnetic cobalt(III) complexes with organic ligands. X The preparation and properties of radical diamminebis(5-nitrosalicylideneaminato)cobalt(III) complex and biradical diamminebis(5-nitrosalicylideneaminato)cobalt(II) complex.
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概要
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From the reaction mixture of diamminebis(salicylideneaminato)cobalt(III) complex, (<U>Remark: Graphics omitted.</U>) (<B>1</B>) and 60% nitric acid, radical diamminebis(5-nitrosalicylideneaminato)cobalt(III) complex, (<U>Remark: Graphics omitted.</U>) (<B>2</B>), and biradical diamminebis(5-nitrosalicylideneaminato)cobalt(II) complex,(<U>Remark: Graphics omitted.</U>) (<B>3</B>), have been isolated and characterized by analytical, magnetic, spectroscopic, and XPS methods. The effective magnetic moments of <B>2</B> and <B>3</B> were 1.7 and 5.5 BM, respectively. In the IR spectrum of <B>2</B>, a band due to the rocking deformation vibration of NH<SUB>3</SUB> was observed at ca. 840 cm<SUP>−1</SUP>. The absorption spectra of <B>2</B> and <B>3</B> showed a strong absorption peak at ca. 690 nm. In the XPS, Co 2p spectra for <B>3</B> showed strong satellites, indicating the oxidation number of the cobalt to be +2, whereas no satellites were observed for the other complexes. In comparison with diamagnetic cobalt(III) complex, (<U>Remark: Graphics omitted.</U>) (<B>4</B>), C 1s spectra for <B>2</B> and <B>3</B> showed much larger shoulders on the higher binding energy side due to the electron-poor carbons. It suggests the presence of an unpaired spin on ligands in accordance with paramagnetism of the complexes.
- 公益社団法人 日本化学会の論文
著者
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Yamamoto Yoshihisa
Faculty Of Engineering Kyushu University
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Konno Hidetaka
Faculty of Engineering, Hokkaido University
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