Electropolymerizable Terthiophene-Terminated Poly(aryl ether) Dendrimers with Naphthalene and Perylene Cores
作者:Ramakrishna Ponnapati、Mary Jane Felipe、Rigoberto Advincula
DOI:10.1021/ma201733a
日期:2011.10.11
terthiophene and n-type perylene and naphthalenediimides into one molecule, we have achieved a dual electrochromic material. These dendrimers were designed to act as electrochemically active precursor polymers, which bear the electroactive terthiophene group that can be cross-linked electrochemically to form conjugated polymer network (CPN) films. Characterization of the optical and redox properties
We
have achieved the stepwise synthesis of 3-substituted thienylzinc reagents using both electrochemical methods
and an original bromination procedure. For several compounds 3-bromothiophene was the starting substrate,
which was functionalized according to recently developed electrochemical procedures. The nickel-catalyzed electrochemical
reduction of the resulting 3-substituted 2,5-dibromothiophenes in the presence of zinc salts allowed the formation
of monothienylzinc species in good yields. The selectivity of this reaction
is discussed within the context of the electrochemical synthesis of regioregular polythiophenes.
Alternate copolymers of head to head coupled dialkylbithiophenes and oligoaniline substituted thiophenes: preparation, electrochemical and spectroelectrochemical properties
New processable, electroactive, alternate copolymers consisting of dialkylbithiophene units and oligoanilinethiophene units have been prepared by post-polymerization functionalization of a specially prepared precursor polymer, namely poly[(4,4″-dioctyl-2,2′∶5′,2″-terthiophene-3′-yl)ethyl acetate], carried out via its hydrolysis and consecutive branching aniline dimer or tetramer through the amidation reaction. The precursor polymer is interesting by itself because it gives a very clear spectroelectrochemical response over a very narrow potential range. The proposed method enables the preparation of regiochemically better defined alkylthiophene-oligoanilinethiophene copolymers with higher content of oligoaniline side groups as compared to previously used methods. Cyclic voltammetry investigations combined with UV–vis–NIR, EPR and Raman spectroelectrochemistry show that both the oligoaniline side groups and poly(thienylene) main chain are electrochemically active. Significant differences for the side group electrochemistry are observed in acidified and nonacidified electrolytes making the prepared new copolymer a good candidate for electrochromic applications in diversified electrolytes.
METHODS FOR PREPARING POLYMER COATINGS BY ELECTROCHEMICAL GRAFTING OF POLYMER BRUSHES, COMPOSITIONS PREPARED THEREBY AND COMPOSITIONS FOR PREPARING THE COATINGS
申请人:Advincula Rigoberto
公开号:US20090236229A1
公开(公告)日:2009-09-24
New methods for the grafting of complex polymer coatings onto conducting surfaces, new grafting compositions and new substrates with grafted coating of the grafting compositions are disclosed. The method offers a new and convenient approach for the preparation of polymer coatings by electrochemically grafting and reactive crosslinking, and/or graft polymerizing.
SENSORS AND SEPARATION BASED ON MOLECULAR RECOGNITION VIA ELECTROPOLYMERIZATION AND COLLOIDAL LAYER TEMPLATES
申请人:Advincula Rigoberto
公开号:US20120263922A1
公开(公告)日:2012-10-18
Novel coatings are disclosed prepared from electropolymerization of electropolymerizable monomers-analyte complexes onto a conducting layer or non-conducting of a substrate, where the analyte is removed by electrochemically mediated washing permitting linear molecular sensing of the analyte over a wide concentration range. The coating may also include templating particles deposited on the electrode substrate prior to electropolymerization, where the particles can be removed to form a submicron structured coating. Methods for making and using the coatings are also disclosed.