Crystal structure,electrochemical and photochemical studies of the trans-[Fe(cyclam)(NO)Cl]Cl2 complex (cyclam = 1,4,8,11-tetraazacyclotetradecane) |
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| Authors: | Alda KM Holanda Francisco ON da Silva Idalina MM Carvalho Alzir A Batista Javier Ellena Eduardo E Castellano Ícaro S Moreira Luiz GF Lopes |
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| Affiliation: | 1. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Cx. Postal 12200, 60455-760 Fortaleza, CE, Brazil;2. Departamento de Química, Universidade Federal de São Carlos, Cx Postal 676, 13565-905 São Carlos, SP, Brazil;3. Instituto de Física de São Carlos, USP, Cx. Postal 780, 13560-250 São Carlos, SP, Brazil |
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| Abstract: | The trans-Fe(cyclam)(NO)Cl]Cl2 complex was synthesized by the reaction of cis-Fe(cyclam)Cl2]Cl with NO gas. The X-ray structure of the complex showed that the Fe–NO] moiety is linear, consistent with the NO+ character of the nitric oxide ligand. This suggestion was reinforced by the IR data, which showed the νNO at 1888 cm−1. The cyclic voltammogram of the trans-Fe(cyclam)(NO)Cl]2+ complex presented three electrochemical processes at −0.70, 0.08 and 0.40 V versus Ag/AgCl. The first and last redox processes are centered at the NO ligand, whereas the second is characteristic of the generated aqua species, trans-Fe(cyclam)Cl(H2O)]2+. Upon irradiation at 330 nm, pH 3.4, the title complex releases the NO moiety with the concomitant generation of the trans-Fe(cyclam)(H2O)Cl]+ complex as suggested by electronic and IR spectroscopy as well as by cyclic voltammetry technique. |
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| Keywords: | Nitric oxide NO release Iron nitrosyl complex Cyclam Photochemical studies Electrochemical studies |
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