Synthesis of polymers containing regularly distributed tetrathia‐[7]‐elicene units along the backbone |
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Authors: | Fabio Fenili Clara Rigamonti Alberto Bossi Paolo Ferruti Amedea Manfredi Stefano Maiorana Clara Baldoli Silvia Cauteruccio Emanuela Licandro Elisabetta Ranucci |
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Affiliation: | 1. Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, via Venezian 21, Milano 20133, Italy;2. CNR Istituto di Scienze e Tecnologie Molecolari, via Golgi 19, Milano 20133, Italy;3. Nerviano Medical Science, viale Pasteur 10, Nerviano, Milano 20014, Italy |
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Abstract: | A tetrathia‐[7]‐helicene bearing in the 2 and 13 positions cyanovinyl groups was used as comonomer in the Michael‐type polyaddition reaction with N,N′‐bis(β‐mercaptoethyl)piperazine. This led to a new polymer bearing tetrathia‐[7]‐helicene units regularly distributed along the polymer backbone, which may be regarded as the first example of a new family of potentially useful nonlinear optical materials. All products were structurally characterized by 1H and 13C NMR spectroscopy. Differential scanning calorimetry characterizations revealed the presence, in both monomeric and polymeric helicenes, of glass‐transition like temperatures, associated to some conformational variation of the helicene units. The optical properties, the film formation and the morphology of the polymer‐containing tetratia‐[7]‐helicenes were also investigated. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010 |
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Keywords: | Michael‐type polyaddition NLO polyamines polyaromatics tetrathia‐[7]‐helicenes |
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