Immobilization of the [RuII(edta)NO+] Ion on the surface of functionalized silica gel |
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Authors: | Zanichelli Patrícia G Sernaglia Rosana L Franco Douglas W |
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Institution: | Instituto de Química de S?o Carlos, Universidade de S?o Paulo, CEP 13566 S?o Carlos, SP, Brazil. |
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Abstract: | The reaction of NO and the immobilized dimer complex (edta)(2)Ru(2)(III(1/2),III(1/2)) on silica gel chemically modified with 3-(2-aminoethyl)aminopropyl]trimethoxysilane (AEATS) produces the corresponding immobilized nitrosyl complex AEATS/Ru(II)NO(+). This compound, a monomer, was obtained by reducing the immobilized ruthenium dimer either electrochemically or with Eu(II) and reacting this species with NO(2)(-) ions. The properties of Ru(edta)NO](-) in solution and anchored (AEATS/Ru(II)NO(+)) on silica were compared using electrochemical (DPV, CV) and spectroscopic (IR, UV-vis, and ESR) techniques. The results indicate that immobilization does not alter the reactivity of the ruthenium complex and confirm that Ru(edta)(H(2)O)](2)(-) may be used, either in solution or immobilized, as a catalyst for the conversion of NO(2)(-) to NO(+). Both the anchored nitrosyl complex AEATS/Ru(II)NO(+) and the Ru(edta)NO](-) species in solution, upon one-electron reduction, liberate NO at comparable rates. |
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