The pale yellowish-whitepowder of SP4Mo8$CH3CN quickly shis to deep purple with aremarkable coloration contrast. Surprisingly, the color changeeffect is less pronounced for SP4Mo8$DMSO – even if its contrastremains noticeable – while SP4Mo8$DMF develops a very weakphotoresponse. SP3Mo8exhibits a fast and intense deep purplecoloration under UV light, nevertheless, its coloration contrast