Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session 2

CPP 37.40: Poster

Wednesday, April 2, 2014, 15:00–19:00, P3

Magnetic susceptibility of thin films of ferrocene containing polymers — •Haiko Didzoleit¹, Markus Gallei², Johannes Elbert², Matthias Rehahn², and Bernd Stühn¹ — ¹TU Darmstadt, Experimental Condensed Matter Physics — ²TU Darmstadt, Ernst-Berl-Institut für Technische und Makromolekulare Chemie

We focus on amphiphilic ferrocene block copolymers (here poly(vinyl ferrocene)-b-poly(vinyl pyridin), PVFc-P2VP) and their magnetic susceptibility depending on the oxidation state in thin films. These films are prepared as Langmuir monolayers on a water substrate and as Langmuir-Blodgett multilayer films on a solid silicon substrate. The structure of the films are monitored by X-Ray reflectivity in situ (water subphase) and ex situ (silicon substrate) and analysed in terms of standard models. In the reduced state the structure of the Langmuir monolayers is dominated by the P2VP block partner and strongly ruled by the surface pressure in the monolayer. The oxidised state induces conformational changes of the ferrocene moiety leading to a swelling of the polymer film on solid substrates and to increased solubility in water leading to a collapse of the Langmuir monolayers. Besides the altered structure on solid substrates we find a switching from diamagnetic to paramagnetic susceptibilities (measured by SQUID magnetometry) in dependency on the oxidation ratio of the ferrocene complex. The impact of the degree of order in the multilayer polymer film on the strength of the magnetic response of the thin films will be discussed.