NO donors cis-[Ru(bpy)2(L)NO] and [Fe(CN)4(L)NO] complexes immobilized on modified mesoporous silica spheres |
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| Authors: | Francisco ON da Silva Elis CC Gomes Thiago dos S Francisco Alda KM Holanda Izaura CN Digenes Eduardo HS de Sousa Luiz GF Lopes Elisane Longhinotti |
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| Institution: | a Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, c.x. Postal 6021, Cep 60455-960 Fortaleza CE, Brazil;b Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, c.x. Postal 6021, Cep 60455-960 Fortaleza CE, Brazil |
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| Abstract: | The reaction of Ru(bpy)2Cl2] and Na2Fe(CN)4(dmso)2] complexes with isonicotinic acid immobilized on silica spheres (Si-ATPS-ISN) followed by a NO bubbling produced Si-ATPS-ISN-Ru(bpy)2(NO)] (system I) and Si-ATPS-ISN-Fe(CN)4(NO)] (system II). The characterization of these systems was carried out by UV–Vis, FTIR spectroscopy and electrochemical techniques. As judged by the FTIR data, the nitric oxide ligand has an NO+ character in both systems (ν(NO+): 1938 cm?1). The NO release, which was monitored by means of FTIR, electrochemistry, and NO sensor electrode, was observed for both systems upon white light irradiation and chemical reduction by cysteine. These results indicated that the system (II) presents a higher potential for controlled NO release. The characterization (FTIR and UV–Vis) of the systems after the NO release suggested the formation of the aqua systems ATPS-ISN-Ru(bpy)2(OH2)] and ATPS-ISN-Ru(bpy)2(OH2)]. |
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| Keywords: | Nitric oxide donors Complexes Ruthenium Iron Mesoporous silica spheres |
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