Improved Photocatalytic H2 Evolution by Cobaloxime-Tethered Imidazole-Functionalized Periodic Mesoporous Organosilica

Molecular cobaloxime-based heterogeneous systems have attracted great interest during the last decades in light-driven hydrogen production. Here, we present a novel cobaloxime-tethered periodic mesoporous organosilica (PMO) hybrid (Im-EtPMO-Co) prepared through immobilization of molecular cobaloxime complex on imidazole groups ethylene-bridged PMO. The successful assembly catalyst via cobalt-imidazole axial ligation has been evidenced by several techniques, such as 13C NMR, Raman spectroscopy, ICP-MS, and XPS. catalytic performance Im-EtPMO-Co was essayed evolution reaction (HER) under visible light presence photosensitizer (Eosin Y) an electron donor (TEOA). It showed excellent production 95 mmol at 2.5 h, which corresponded to TON 138. These results reflect improved photocatalytic activity with respect its homogenous counterpart [Co(dmgH)2(Im)Cl] well previous cobaloxime-PMO system pyridine complex.