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(A) Quantum yields of the photo-ring-opening (Φc–o: black balls) and photo-ring-closing (Φo–c: red balls) processes for the BDHPPy+/BCPDPy+ photochromic couple in water as a function of the irradiation wavelengths. (B) Conversion percentages of open (black) and closed (red) forms at the PSS for different wavelengths. Note: Φc–o are not given below 500 nm due to high uncertainties.
