Synthesis and polymerization of cationic bis(cyclopentadienyliron)arene complexes containing arylazo dyes

The synthesis of the title complexes was achieved via the reaction of eta(6)-p-cyclopentadienyliron cations with 4,4'-bis(4-hydroxyphenyl)valeric acid to produce the diiron complexes which were then reacted with a number of arylazo dyes to give cationic bis(cyclopentadienyliron)arene complexes containing the arylazo dyes. These iron-containing monomers were subsequently polymerized via nucleophilic aromatic substitution using 1,8-octanedithiol, 4,4'-thiobisbenzenethiol, or bisphenol A to produce the desired coloured cationic organoiron polymers. The weight - average molecular weights were estimated to range from 11,800 to 31,600. UV-vis studies conducted in dimethylformamide (DMF) showed that the metallated polymers exhibited lambda(max) of 412-491 nm. Addition of HCl to the polymer solution caused a bathochromic shift into the range of 515-530 nm. Thermogravimetric analysis (TGA) revealed that the iron moieties were cleaved between 205 and 248 degrees C while the polyether/thioether backbone degraded between 380 and 613 degrees C. Differential scanning calorimetry (DSC) showed that the polymers exhibited glass transition temperatures (Tg) ranging from 106 to 184 degrees C.