Thermal reaction of aquaammineruthenium(III) complex with amino acid or imidazole derivative in the solid state |
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| Authors: | Susumu Kohata Kazuhiro Sagara Hitoshi Takada Akira Ohyoshi |
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| Institution: | Yatsushiro National College of Technology, Yatsushiro 866, Japan;Department of Synthetic Chemistry, Faculty of Engineering, Kumamoto University, Kumamoto 860, Japan |
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| Abstract: | Intermolecular thermal-substitution reaction between aquaammineruthenium(III) complex and amino acid or imidazole derivative has been investigated in the solid state by the TG-DTA method. Pentaammineruthenium(III) complexes containing amino acid or imidazole derivative have been obtained directly by the thermal reactions. Glycine, β-alanine, and γ-aminobutyric acid coordinate to Ru(III) through their carbonyl oxygen, and imidazole does through its N(3) atom. Distinct coordination site is provided in the complex with histidine and/or adenine: the bonding site depends on the outer-sphere anion of aquaammine complex. The N(3) atom of the histidine and N(7) atom of the adenine coordinate to Ru(III) taking the paratoluenesulphonate salt of aquaammineruthenium(III) into the reaction. When the methanesulphonate salt is used, the nitrogen atom in the side-chain amino-group participates in complexation. Direct chelation of the glycine, histidine, and adenine to the deaquated cis-diaquatetraammineruthenium(III) complex has been confirmed. |
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| Keywords: | Author to whom correspondence should be addressed |
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