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Electron-transfer (ET) photochromic compounds have received intense attention in the past years owing to their various potential applications, ranging from clean energy to photo-or electrochromic devices.1 We recently obtained two compounds by a simple solution method:[H2(Bpy)][H3(Pma)]2 (1).2 [H(Bpy)]2[H2(Pma)] (2),3 and first found theirs photochromic behavior.