The synthesis of the title complexes was achieved via the reaction of \(\eta^{6}\)-p-dichlorobenzene- \(\eta^{5}\)-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 °C while the polyether/thioether backbone degraded between 380 and 613 °C. Differential scanning calorimetry (DSC) showed that the polymers exhibited glass transition temperatures (Tg) ranging from 106 to 184°C.
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Financial support provided by the Natural Sciences Engineering and Research Council of Canada (NSERC) and the University of Winnipeg are gratefully acknowledged.
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This paper is dedicated to Professor Richard J. Puddephatt in recognition of his outstanding contribution to the field of metal-containing polymers.
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Abd-El-Aziz, A.S., Pereira, N.M., Boraie, W. et al. Synthesis and Polymerization of Cationic bis(cyclopentadienyliron)arene Complexes Containing Arylazo Dyes. J Inorg Organomet Polym 15, 497–509 (2005). https://doi.org/10.1007/s10904-006-9004-4
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DOI: https://doi.org/10.1007/s10904-006-9004-4