title: Layer-by-layer deposition of molecular oligoelectrolytes-investigation of assembling and degradation behaviour.
abstract: The assembly and degradation behavior of oligoelectrolyte multilayer films (OEMs) self assembled by layer-by-layer deposition of positively and negatively charged oligoelectrolytes 1-6 was investigated. Next to colorless oligoelectrolytes we have employed representatives involving chromophores, in particular porphyrins. This allows for the systematic observation of both assembly and disassembly of the OEMs using optical spectroscopy, where chromophore containing building blocks serve as reporter electrolytes. The OEMs investigated in this study were built in a consistent, monomolecular matter and show linear correlation between the absorption and the number of layers. Using the concept of reporter electrolytes we have introduced for the first time also the use of non-chromophoric oligoelectrolytes, such as the new synthesized cationic system 2 as building blocks for OEMs. Moreover, we have investigated for the first time the degradation behavior of OEMs. We demonstrated that two different mechanisms of degradation proceed at the same time. The direct degradation is accompanied by a second release mechanism.
authors.affiliation: Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM) Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: Karin
authors.initials: K
authors.lastname: Rosenlehner
authors.forename: Torsten
authors.initials: T
authors.lastname: Schunk
authors.forename: Norbert
authors.initials: N
authors.lastname: Jux
authors.forename: Michael
authors.initials: M
authors.lastname: Brettreich
authors.forename: Andreas
authors.initials: A
authors.lastname: Hirsch
mesh_terms: D004573:Electrolytes / Q000737:chemistry*; D008567:Membranes, Artificial; D008958:Models, Molecular; D015394:Molecular Structure; D011166:Porphyrins / Q000737:chemistry; D013053:Spectrophotometry; D013499:Surface Properties
chemical_list: D004573:Electrolytes; D008567:Membranes, Artificial; D011166:Porphyrins