4512-44-1Relevant articles and documents
Helical Peptides Design for Molecular Dipoles Functionalization of Wide Band Gap Oxides
Bartynski, Robert A.,Chen, Yuan,Galoppini, Elena,Harmer, Ryan,Rangan, Sylvie,Viereck, Jonathan
, p. 3489 - 3498 (2020/03/06)
The use of helical hexapeptides to establish a surface dipole layer on a TiO2 substrate, with the goal of influencing the energy levels of a coadsorbed chromophore, is explored. Two helical hexapeptides, synthesized from 2-amino isobutyric acid
Effect of a strong interfacial electric field on the orientation of the dipole moment of thiolated aib-oligopeptides tethered to mercury on either the N- or C-terminus
Becucci, Lucia,Guryanov, Ivan,Maran, Flavio,Guidelli, Rolando
experimental part, p. 6194 - 6204 (2010/07/04)
Four oligopeptides consisting of a sequence of α-aminoisobutyric acid (Aib) residues, thiolated at either the N- or C-terminus by means of a -(CH2)2-SH anchor, were self-assembled on mercury, which is a substrate known to impart a high fluidity to self-assembled monolayers (SAMs). The surface dipole potential of these peptide SAMs was estimated in 0.1 M KCl aqueous solution at a negatively charged electrode, where the interfacial electric field is directed toward the metal. To the best of our knowledge, this is the first estimate of the surface dipole potential of peptide SAMs in aqueous solution. The procedure adopted consisted in measuring the charge involved in the gradual expansion of a peptide-coated mercury drop and then combining the resulting information with an estimate of the charge density experienced by diffuse layer ions. The dipole moment of the tethered thiolated peptides was found to be directed toward the metal, independent of whether they were thiolated at the C- or N-terminus. This result was confirmed by the effect of these SAMs on the kinetics and thermodynamics of the Eu(III)/Eu(II) redox couple. The combined outcome of these studies indicates that a strong interfacial electric field orients the dipole moment of peptide SAMs tethered to mercury, even against their natural dipole moment.
