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a, Ring-opening polymerization of BF2dbm(I)PLA (P1-P3). b-e, Steady-state emission spectra of polymers P1-P3 as powders (b,c) and spin-cast films (d,e) under air (b,d) and under N2 (c,e). f,g, Simple-cast P1-P3 (right to left) films in vials under air (f) and N2 (g) (ultraviolet excitation: λex = 365 nm).
