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Scheme of the reversible light-triggered opening mechanism from loaded mesoporous silica nanoparticles surface functionalized with one of the proposed ruthenium-based complex systems (MSN2-RC2). Under visible light irradiation (>395 nm), the photochemical cleavage of the ligands leads to opened gates with a subsequent release of the dye in aqueous suspension. If heat is applied (at 80 °C), the system closes reversibly and no release is observed.
