Ferrocene-functionalized polymer separation

In the 1980s, the successful synthesis of elastomeric polyamides 120 of high molecular weight (d/n =10,000-18,000) was reported from the polycondensation of l,l -bis(/ -aminoethyl)ferrocene with diacid chlorides (Scheme 13). Also, polyureas 121 were prepared from the same ferrocene monomer and diisocyanates, and polyesters and polyurethanes were prepared from l,l -bis(/ -hydroxyethyl)ferrocene. However, the latter materials had much lower molecular weights and were characterized only by scanning electron microscopy. X-ray, and IR analyses. The introduction of ferrocenes in which the functional groups are separated from the cyclopentadienyl ring by at least two methylene units was crucial in order to reduce steric effects and to avoid the instability found previously in polymers of a-functionalized ferrocene due to the a-ferrocenyl carbonium ion stability. 

Adsorption of small redox-active molecules (e.g. ferrocene [326]) on ITO can be used to probe changes in electrochemical activity of ITO surface as a function of surface pretreatment [314]. Adsorption of ferrocene dicarboxylic add (Fc(COOH)2) and 3-thiophene acetic acid (3-TAA) onto ITO was achieved by soaking ITO in a 1 mM solution of these small molecules in pure ethanol for 10 min and then rinsing briefly with acetonitrile [314-316]. To ensure reproducibility, the adsorption of Fc(COOH)2 on pretreated ITO was repeated a minimum of three times on three separate ITO samples, for each pretreatment condition [314]. Chemisorbed small molecules on ITO will provide for better direct contact of added conducting polymer layers and/or hole transport layers (HTLs) in the devices [316],... 

---