Abstract
An iron(III) complex of tetradentate N,N′-disubstituted bis(aminophenoxide) (designated as salan, a saturated version of the corresponding salen ligand) with a sterically hindered organic base anchored on the ligand framework, can selectively mediate the conversion of carbonyl sulfide to sulfur-containing polymers by the copolymerization with epoxides. This single-site catalyst exhibits broad substrate scope, and the resultant copolymers have completely alternating structures. In addition, this catalyst is efficient in producing diblock copolymers, suggesting a living polymerization nature.
Highlights
Carbonyl sulfide (COS), as one of the largest components of organic sulfur compounds, is mainly produced from volcanic eruption and catabolism of biogenic volatile sulfur compounds, as well as human industrial activity [1]
We have demonstrated that the Cr(III)-salen complexes bearing a sterically hindered organic base were excellent catalysts for COS/epoxides copolymerization to produce the corresponding poly(monothiocarbonate)s with high molecular weight and narrow monodispersity [18]
The further treatment with AgNO3 gave complex 2 (Figure 2). Since these iron complexes are dissolved in neat epoxides surveyed, the catalyzed copolymerization of COS and epoxides does not require any organic cosolvent
Summary
Carbonyl sulfide (COS), as one of the largest components of organic sulfur compounds, is mainly produced from volcanic eruption and catabolism of biogenic volatile sulfur compounds, as well as human industrial activity [1]. We developed a bifunctional Cr(III)-salen catalyst for COS/epoxides copolymerization in a remarkable activity, and no oxygen–sulfur exchange reaction was observed even at elevated temperatures [18]. We have demonstrated that the Cr(III)-salen complexes bearing a sterically hindered organic base were excellent catalysts for COS/epoxides copolymerization to produce the corresponding poly(monothiocarbonate)s with high molecular weight and narrow monodispersity [18]. We found the introduction of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (designated as TBD) on the ligand framework could obviously decrease the catalyst loading and increase the polymer selectivity [18,32] Motivated by these facts, we set out to develop an iron(III) complex of salan appending a TBD as single-site catalyst for efficiently converting COS to a wide range of sulfur-containing polymers by the copolymerization with epoxides
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