Keywords: Amine ligands / Chelates / Ligand design / Stability constantsThe protonation and metal complex formation of the branched pentaamine ligand 2,2,6,6-tetrakis(aminomethyl)-
and 2-(dibenzyl-4-yl)-7-benzylindole (DBBI) under conditions for potentiodynamic electrochemical polymerization (0.3-0.9 V vs. Ag/Ag + in acetonitrile) underwent dimerization reactions as was shown by simulation of the potentiodynamic cycles. But DBBI alone polymerized (and only on Au), obviously because of its free N and C(3) positions. This conducting polymer could be technically interesting, because it does not show redox activities in the potential range 0.0-1.1 V vs. the Ag/AgCl electrode. Keywords: indoles, electropolymerization, cyclic voltammetry, role of substrate in polymeri-zation, simulation of CV.Indole and some of its derivatives can be polymerized electrochemically. But up to now only a few applications are known, for example, electrodes sensitive to glucose with composite coatings of polyindole and glucose oxidase [1] or to cytochrome C with coatings of 5-carboxyindole [2].The structure and polymerization mechanism of polyindole (PI) and of its derivatives is controversial [3-7], and even some experimental results seem to be contradictory. It is generally accepted that oxidation generates the indolyl radical cation, which can be deprotonated. MO calculations [6] showed that the unpaired electron and the positive charge are delocalized over the whole indole ring and that structures preserving the aromatic ring should be preferred. The high spin densities at N and C(3) positions seem to present themselves for binding.Investigations of methylindoles indicate that 3-methylsubstituted indoles do not polymerize [8,9]. In [10,11] there was reported polymerization of some methylindoles with free C(3) position, whereas other groups could only detect dimerization and trimerization [8,9] and assumed that methyl groups in the pyrrole ring were N H DBBI 1 2 3 4 5 6 7 __________________________________________________________________________________________ 1 FR 8.13. Physical
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.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.