Novel Optical CO&lt;SUB&gt;2&lt;/SUB&gt; Sensing Material: pH Indicator Immobilized in Fluorine-Containing Poly(aryl ether ketone) Films

Preparation of the water-soluble, kinetically labile, high-spin iron(II) tetrakis(4-sulfonatophenyl)porphyrin, Fe(II)TPPS(4-), has been realized in neutral or weakly acidic solutions containing acetate buffer. The buffer played a double role in these systems: it was used for both adjusting pH and, via formation of an acetato complex, trapping trace amounts of iron(III) ions, which would convert the iron(II) porphyrins to the corresponding iron(III) species. Fe(II)TPPS(4-) proved to be stable in these solutions even after saturation with air or oxygen. In the absence of acetate ions, however, iron(II) ions play a catalytic role in the formation of iron(III) porphyrins. While the kinetically inert iron(III) porphyrin, Fe(III)TPPS(3-), is a regular one with no emission and photoredox properties, the corresponding iron(II) porphyrin displays photoinduced features which are typical of sitting-atop complexes (redshifted Soret absorption and blueshifted emission and Q absorption bands, photoinduced porphyrin ligand-to-metal charge transfer, LMCT, reaction). In the photolysis of Fe(II)TPPS(4-) the LMCT process is followed by detachment of the reduced metal center and an irreversible ring-opening of the porphyrin ligand, resulting in the degradation of the complex. Possible oxygen-binding ability of Fe(II)TPPS(4-) (as a heme model) has been studied as well. Density functional theory calculations revealed that in solutions with high acetate concentration there is very little chance for iron(II) porpyrin to bind and release O(2), deviating from heme in a hydrophobic microenvironment in hemoglobin. In the presence of an iron(III)-trapping additive that is much less strongly coordinated to the iron(II) center than the acetate ion, Fe(II)TPPS(4-) may function as a heme model.

show abstract

Air-stable, heme-like water-soluble iron(II) porphyrin: in situ preparation and characterization

Huszánk

Lendvay

Horváth

2007

J Biol Inorg Chem

View full text Add to dashboard Cite

show abstract

Phosphorescent sensing of carbon dioxide based on secondary inner-filter quenching

Vargas-Sansalvador

Carvajal

Roldán-Muñoz

et al. 2009

Analytica Chimica Acta

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Novel Optical CO<SUB>2</SUB> Sensing Material: pH Indicator Immobilized in Fluorine-Containing Poly(aryl ether ketone) Films

Cited by 2 publications

References 0 publications

Air-stable, heme-like water-soluble iron(II) porphyrin: in situ preparation and characterization

Air-stable, heme-like water-soluble iron(II) porphyrin: in situ preparation and characterization

Phosphorescent sensing of carbon dioxide based on secondary inner-filter quenching

Contact Info

Product

Resources

About