Spectroscopic and electrochemical behavior of a supramolecular tetrapyridylporphyrin encompassing four terpyridine(oxalate) chloridoruthenium(II) complexes and its use in nitrite sensors

Autor(es)

Bonacin, Juliano Alves ^[1] ; Katic, Vera ^[1] ; Figueiredo Toledo, Kalil Cristhian ^[1] ; Toma, Henrique Eisi ^[2]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Inst Chem, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Inorganica Chimica Acta; v. 437, p. 127-132, OCT 1 2015.
• Citações Web of Science: 4

Resumo

Supramolecular species combining ruthenium(II) polypyridines and tetrapyridylporphyrins (TPyP) have been employed in electrochemical and molecular sensing devices, because of their unique synergistic properties. In this work, a new tetraruthenated porphyrin, 4-TRoxPyP has been synthesised, encompassing four pyridine bridged {[}Ru(Cl-tpy)(ox)] complexes (Cl-tpy = chloroterpyridine, ox = oxalate ion). Such species exhibit characteristic electronic transitions of porphyrin and ruthenium polypyridine complexes, such as a Soret band at 414 nm, Q bands at 514 nm, 557 nm and 588 nm and a ruthenium-to-terpy charge-transfer band at 643 nm. A typical tetraruthenated porphyrin redox process has been observed at 0.72 V versus NHE, associated with the peripheral Ru3+/(2+) complexes. Their thin films have been prepared by drop casting onto a glassy carbon electrode, and successfully employed in nitrite analysis, by monitoring the chronoamperometric response at the Ru3+/2+ redox gate. A linear relationship between the anodic peak current and concentration of the analyte has been observed from 0 to 0.10 mmol L (1), with a nitrite detection limit of 7.60 mu mol L-1. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 02/07066-2 - Desenvolvimento de sistemas supramoleculares metal-orgânicos com unidades periféricas funcionalizadas
• Beneficiário: Juliano Alves Bonacin
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto