We report the discovery of two long-wavelength (365nm) photoactivatable diaryltetrazoles through screening a small library of diaryltetrazoles that were designed using a 'scaffold hopping'strategy. A naphthalene-derived tetrazole showed excellent reactivity in the photoinduced cycloaddition reaction with methyl methacrylate under 365nm photoirradiation in acetonitrile PBS buffer mixture. Besides, the brightly fluorescent pyrazoline ...