title: Triple-Stimuli-Responsive Ferrocene-Containing PEGs in Water and on the Surface.
abstract: Triple-stimuli-responsive PEG-based materials are prepared by living anionic ring-opening copolymerization of ethylene oxide and vinyl ferrocenyl glycidyl ether and subsequent thiol-ene postpolymerization modification with cysteamine. The hydrophilicity of these materials can be tuned by three stimuli: (i) temperature (depending on the comonomer ratio), (ii) oxidation state of iron centers in the ferrocene moieties, and (iii) pH-value (through amino groups), both in aqueous solution and at the interface after covalent attachment to a glass surface. In such materials, the cloud point temperatures are adjustable in solution by changing oxidation state and/or pH. On the surface, the contact angle increases with increasing pH and temperature and after oxidation, making these smart surfaces interesting for catalytic applications. Also, their redox response can be switched by temperature and pH, making this material useful for catalysis and electrochemistry applications. Exemplarily, the temperature-dependent catalysis of the chemiluminescence of luminol (a typical blood analysis tool in forensics) was investigated with these polymers.
authors.affiliation: Max Planck Institute for Polymer Research (MPIP) , Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Arda
authors.initials: A
authors.lastname: Alkan
authors.affiliation: Max Planck Institute for Polymer Research (MPIP) , Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Steinmetz
authors.affiliation: Max Planck Institute for Polymer Research (MPIP) , Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Katharina
authors.initials: K
authors.lastname: Landfester
authors.affiliation: Max Planck Institute for Polymer Research (MPIP) , Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Frederik R
authors.initials: FR
authors.lastname: Wurm
mesh_terms: D002384:Catalysis; D004563:Electrochemistry; D004986:Ether / Q000737:chemistry; D005027:Ethylene Oxide / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry*; D005898:Glass / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D049449:Luminescence; D008165:Luminol / Q000737:chemistry; D000075163:Metallocenes; D010084:Oxidation-Reduction; D011092:Polyethylene Glycols / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D005296:Ferrous Compounds; D000075163:Metallocenes; D014867:Water; D004986:Ether; D011092:Polyethylene Glycols; D008165:Luminol; D006861:Hydrogen Peroxide; D005027:Ethylene Oxide; C004998:ferrocene
keywords: ferrocene; polyether; redox-active polymer; smart surface; stimuli responsive