Figure 4: Dissolution mechanism of MALI in a polar aprotic solvent.
From: Selective dissolution of halide perovskites as a step towards recycling solar cells
(a) 13C sp2 and (b) 13C sp3 chemical shifts of PbI2–DMF and MALI-DMF away from the corresponding signals for a pure DMF solution. (c) Scheme of the resonance structure of DMF, with a partially positive and negative polarity. Chemical bonding structures of the (d) PbI2 and (e) PbI6 frames of MALI with the partially negative oxygen of DMF. (Red spheres: oxygen, blue spheres: nitrogen, grey spheres: carbon, white spheres: hydrogen, yellow spheres: lead, violet spheres: iodine.)
