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Absorption spectra and stability tests. a Electronic absorption spectra of (i) 1·(PF6)2 and (ii) 2·(NO3)2 in CH2Cl2 at 25 °C with visible absorption maxima normalized. b Monitoring of absorption spectra of (i) 1·(PF6)2 and (ii) 2·(NO3)2 in CH2Cl2 under ambient light and temperature (~25 °C) and time courses of Abs/Abs0 at 630 nm of 1·(PF6)2 (filled circles) at 593 nm of 2·(NO3)2 (filled diamonds)
