Formation of polymeric Lewis acid-Lewis base complexes with well-defined organoboron polymers

Yang Qin, Frieder Jäkle

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The binding of Lewis bases to organoboron polymeric Lewis acids has been studied and the parameters that determine the complexation equilibrium have been investigated, which include (i) the strength of the individual Lewis acids and Lewis bases, (ii) concentration, and (iii) temperature. While the strongly Lewis acidic borane polymers poly(4-bis(pentafluorophenyl)borylstyrene) (PS-BPf) and poly(4-(di-2-thienylboryl)styrene) (PS-BTh) form isolable complexes with strong Lewis bases such as 4-t-butylpyridine ( tPy), a temperature dependent equilibrium is established with weaker bases such as THF. Similarly, the weakly Lewis acidic boronate polymer poly(4-diethoxyborylstyrene) (PS-BOEt) undergoes a temperature dependent equilibrium with the strong Lewis base 4-dimethylaminopyridine (DMAP), while poly(4-pinacolatoborylstyrene) (PS-BPin) does not significantly bind to pyridine bases. Decomplexation of PS-BTh· t Py is achieved by treatment with the stronger Lewis acid, B(C 6F 5) 3, thereby confirming the reversible nature of the polymeric Lewis acid-base adducts.

Original languageEnglish (US)
Pages (from-to)149-157
Number of pages9
JournalJournal of Inorganic and Organometallic Polymers and Materials
Issue number1
StatePublished - Mar 2007

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry


  • Boron
  • Complexes
  • Lewis acids
  • Lewis bases
  • Organoboron polymers


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