[en] Iminophosphoranes with the general formula (R3P═NR′) have great potential in synthetic chemistry as valuable precursors/intermediates in organic synthesis or as building blocks for various organic compounds. However, the synthetic approaches and conditions to prepare iminophosphoranes are still poorly understood, limiting the utility of this chemistry for organic materials. In this article, a simple and efficient synthesis of previously unattainable poly(arylene iminophosphoranes) is reported. The azide-phosphine Staudinger polycondensation is used, and the reaction conditions are carefully studied, including consideration of light and air, the influence of solvent and temperature, and investigation of the electronic and steric effects of multiazides. The newly defined reaction conditions appear to be highly versatile, allowing the use of both electron-rich and electron-deficient arylazides for reaction with phosphines to synthesize a library of poly(arylene iminophosphorane) networks that exhibit exceptional thermal and oxidative stability. Interestingly, despite the ylidic-form of the iminophosphorane linkage as shown by theoretical calculations, these newly developed poly(arylene-iminophosphorane) networks exhibit semiconducting properties, such as absorption band edges up to 800 nm and optical band gaps in the range of 1.70 to 2.40 eV. Finally, we demonstrate the broad applicability of these polymers by processing them into glassy films, creating foam-like structures and synthesizing metallo-polymer hybrids.
Research Center/Unit :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège CERM - Center for Education and Research on Macromolecules - ULiège [BE]
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Kotnik, Tomaž; National Institute of Chemistry - University of Ljubljana - Ljubljana -Slovenia
Debuigne, Antoine ; University of Liège [ULiège] - Complex and Entangled Systems from Atoms to Materials [CESAM] Research Unit - Center for Education and Research on Macromolecules [CERM] - Belgium
De Winter, Julien; University of Mons [UMons] - Organic Synthesis and Mass Spectrometry Laboratory - Belgium
Huš, Matej; National Institute of Chemistry - Association for Technical Culture of Slovenia - Institute for the Protection of Cultural Heritage of Slovenia - Ljubljana -Slovenia
Pintar, Albin; National Institute of Chemistry - Ljubljana -Slovenia
Kovačič, Sebastijan ; National Institute of Chemistry - Ljubljana -Slovenia ; University of Maribor - Faculty of Chemistry and Chemical Engineering - Slovenia
Language :
English
Title :
Unlocking the potential of azide-phosphine Staudinger reaction for the synthesis of poly(arylene iminophosphorane)s and materials therefrom
This work was supported by the Ministry of Education, Science and Sport of the Republic of Slovenia and the Slovenian Research Agency (Grants P2- 0150, P2-0152, N2-0340, N1-0303, J2-4424, and I0-0039). T.K. and S.K. would like to thank the World Federation of Scientists for their financial support. The authors would like to thank Uroš Javornik (National Institute of Chemistry) for his kind assistance with NMR spectroscopy. A.D. is a Senior Research Associate and would like to thank the National Fund for Scientific Research (F.R.S.–FNRS) for funding and Dr. R. Riva for skillful assistance.
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