Paramagnetic cobalt(III) complexes with organic ligands V. The isolation and properties of salts of the paramagnetic bis(2,2'-bipyridine)(5-nitrosalicylato)cobalt(III) and of the paramagnetic ".BETA.1 and .BETA.2"-isomers of the 5-nitrosalicylato(triethyl

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概要

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• The picrate of the paramagnetic, [Co(5-NO<SUB>2</SUB>sal)(bpy)<SUB>2</SUB>]<SUP>2+</SUP>, has been isolated from a reaction mixture of picric acid, 60% nitric acid, and bis(2,2′-bipyridine)(salicylato)cobalt(III) chloride trihydrate, [Co(sal)(bpy)<SUB>2</SUB>]Cl·3H<SUB>2</SUB>O, which had been prepared from salicylic acid and <I>cis</I>-bis(2,2′-bipyridine)dichlorocobalt(III) chloride dihydrate. The absorption spectrum and the stability of an aqueous solution of the picrate of the paramagnetic, [Co(5-NO<SUB>2</SUB>sal)(bpy)<SUB>2</SUB>]<SUP>2+</SUP>, were somewhat different from those of complexes of the paramagnetic, [Co(5-NO<SUB>2</SUB>sal-R)(NH<SUB>3</SUB>)<SUB>4</SUB>]<SUP>2+</SUP> (R: H, CH<SUB>3</SUB>). Several complexes of the paramagnetic, β<SUB>1</SUB>-5-nitrosalicylato-, β<SUB>2</SUB>-5-nitrosalicylato-, and β<SUB>2</SUB>-3-methyl (and 4-methyl)-5-nitrosalicylato(triethylenetetramine)cobalt(III) have, analogously, been isolated from reaction mixtures of 60% nitric acid and β<SUB>1</SUB>-salicylato-, β<SUB>2</SUB>-salicylato, or β<SUB>2</SUB>-methylsalicylato(triethylenetetramine)cobalt(III) chloride hydrate respectively. Their β<SUB>1</SUB> and β<SUB>2</SUB>-isomeric forms were proved by a study of their IR and <SUP>1</SUP>H-NMR spectra. From the IR, NMR, and the magnetic susceptibility measurement results, these compounds are considered to have the paramagnetic complex, [Co(5-NO<SUB>2</SUB>sal)L]<SUP>2+</SUP>(L: (NH<SUB>3</SUB>)<SUB>4</SUB>, (en)<SUB>2</SUB>, (bpy)<SUB>2</SUB>, and trien), and the electron hole is considered to delocalize over the chelate ring containing the cobalt atom and the 5-nitrosalicylato ligand.

• 公益社団法人 日本化学会の論文

著者

• Yamamoto Yoshihisa

  Faculty Of Engineering Kyushu University

• Yamamoto Yoshihisa

  Faculty of Pharmaceutical Sciences, Higashi Nippon Gakuen University

• Toyota Eiko

  Faculty of Pharmaceutical Science, Higashi Nippon Gakuen University

• Toyota Eiko

  Faculty of Pharmaceutical Sciences, Higashi Nippon Gakuen University

• Mitsudera Naoto

  Faculty of Pharmaceutical Sciences, Higashi Nippon Gakuen University

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