6533b7ddfe1ef96bd1274abb

RESEARCH PRODUCT

Bisferrocenyl-functionalized pseudopeptides: access to separated ionic and electronic contributions for electrochemical anion sensing

subject

description

Pseudopeptidic receptors containing ferrocene fragments have been prepared and their response to a series of anions was measured by a voltammetry of microparticles methodology. Such water-insoluble compounds yield anion-assisted reversible solid-state oxidations differing in their open-circuit potential and their midpeak potential recorded in cyclic voltammetric measurements. The difference between those potentials provides the individual thermodynamic contributions of electron and proton transfer, revealing that the mechanism of an ion-sensitive electrode can differ in potentiometry and voltammetry. The studied receptors are potentially interesting for potentiometric sensing, showing relatively high selectivity for H2PO4− and HPO42− anions. Financial support by the Spanish MINECO and FEDER (Projects and Consolider-Ingenio, Projects CSD2010-000652010, CTQ2013-48917-C3-1-P and CTQ2014-53736-C3-2-P) and Unidad de Excelencia MDM 2015-0038, and Generalitat Valenciana (PROMETEOII 2015/002) is gratefully acknowledged. V. M.-C. and M. D. P. thank the Spanish Ministry of Science and Education for predoctoral (FPU AP2007-02562) and postdoctoral (SB2010-0088) fellowships. MDP also thankful to UGC India for startup grant. The support of the SCIC of the UJI for instrumental techniques is acknowledged.