[EN] TRANSITION METAL COMPLEX CONTAINING TETRADENTATE NITROGEN DONOR LIGAND AND ELECTROCHEMICAL BIOSENSOR COMPRISING SAME [FR] COMPLEXE DE MÉTAL DE TRANSITION CONTENANT UN LIGAND DONNEUR D'AZOTE TÉTRADENTATE ET BIOCAPTEUR ÉLECTROCHIMIQUE LE COMPRENANT [KO] 테트라덴테이트 질소 공여체 리간드를 포함하는 전이금속 착체 및 이를 포함하는 전기화학적 바이오센서
[EN] TRANSITION METAL COMPLEX CONTAINING TETRADENTATE NITROGEN DONOR LIGAND AND ELECTROCHEMICAL BIOSENSOR COMPRISING SAME [FR] COMPLEXE DE MÉTAL DE TRANSITION CONTENANT UN LIGAND DONNEUR D'AZOTE TÉTRADENTATE ET BIOCAPTEUR ÉLECTROCHIMIQUE LE COMPRENANT [KO] 테트라덴테이트 질소 공여체 리간드를 포함하는 전이금속 착체 및 이를 포함하는 전기화학적 바이오센서
significant in the low-spin species than in the high-spin species. The logarithm of the reaction rate constant is linearly correlated with the energy gap between the catecholatoiron(III) and semiquinonatoiron(II) states for the high-spincomplexes 1-3, although complexes 4 and 5 deviate negatively from linearity. The lower reactivity of the low-spin complex, despite its higher spin density on the catecholate
LIGANDS DESIGNED TO PROVIDE HIGHLY ACTIVE CATALYST COMPLEXES
申请人:Carnegie Mellon University
公开号:US20150087795A1
公开(公告)日:2015-03-26
A series of ligands with site specific electron donating substituents that form a catalyst complex with a transition metal and are suitable for catalysis of atom transfer radical reactions, including ATRP are described. Faster catalysis rates were observed allowing for low catalyst concentrations and linear increases in molecular weight with monomer conversion, and narrow molecular weight distributions. Cyclic voltammetry revealed that increasing the strength and number of conjugated electron donating groups resulted in more stable complexes and larger ATRP equilibrium constants.
Surfactant assisted formation of a catalyst complex for emulsion atom transfer radical polymerization processes
申请人:CARNEGIE MELLON UNIVERSITY
公开号:US11174325B2
公开(公告)日:2021-11-16
Systems and methods for Atom Transfer Radical Polymerization (ATRP) emulsion polymerization are provided. The ATRP emulsion polymerization comprises a suspending medium, a dispersed medium, a surfactant, a transition metal compound in a higher oxidation state, a ligand, and an ATRP initiator. The transition metal compound is capable of forming a catalyst complex in a presence of the ligand. The catalyst complex is soluble in the suspending medium and is capable of forming an ionic complex with the surfactant. The ionic complex is capable of moving between the suspending medium and the dispersed medium. A portion of the transition metal compound in the higher oxidation state within a portion of the catalyst complex is reduced by a physical and/or a chemical procedure thereby initiating a polymerization of one or more radically (co)polymerizable monomers by reaction with the initiator.
SURFACTANT ASSISTED FORMATION OF A CATALYST COMPLEX FOR EMULSION ATOM TRANSFER RADICAL POLYMERIZATION PROCESSES
申请人:CARNEGIE MELLON UNIVERSITY
公开号:US20200055967A1
公开(公告)日:2020-02-20
Systems and methods for Atom Transfer Radical Polymerization (ATRP) emulsion polymerization are provided. The ATRP emulsion polymerization comprises a suspending medium, a dispersed medium, a surfactant, a transition metal compound in a higher oxidation state, a ligand, and an ATRP initiator. The transition metal compound is capable of forming a catalyst complex in a presence of the ligand. The catalyst complex is soluble in the suspending medium and is capable of forming an ionic complex with the surfactant. The ionic complex is capable of moving between the suspending medium and the dispersed medium. A portion of the transition metal compound in the higher oxidation state within a portion of the catalyst complex is reduced by a physical and/or a chemical procedure thereby initiating a polymerization of one or more radically (co)polymerizable monomers by reaction with the initiator.