Preparation, Structures And Catalytic Properties For Visible-light-driven Hydrogen Production Of Non-noble Metal Complexes Based On Rhodamine 6G Schiff Bases

With the development of industry and economy, the world is facing an important problem: lack of energy. Developing the new recycled clean energy is extremely urgent. The reserach of coverting solar energy into chemical energy and then stroed efficiently has bright prospects. As we all know, hydrogen energy is stand out which is regarded as the clean energy with the merit of low carbon and zero carbon. Hydrogen gas has the advantages of high calorific value and pollution-free after burning, so it is promised as a new kind of energy source instead of fossil fuels in the future. Thus far, many scientists have spent much effect in exploring cheaper hydrogen energy. And solar energy has attracted many attentions in photocatalystic H2 production by water splitting. While, that is the most important to find a suitable catalyst for water splitting. Therefore, preparing the efficient and low-coast catalyst is photocatalysis research emphasis to scientists for many years.In this paper, we designed and synthesized two rhodamine 6G-based schiff base ligands L1 and L2, complexes [Co(L1)2Cl]?DMF(1), [Co3(L1)2]?DMF(2), [Co12(L1)6(OH)6(Ac)6]?2DMF?8H2O(3), [Cu(L2)]?H2O}n(4), [Co(L2)2]?2H2O(5), {[Cd(L2)(DMF)(H2O)]?2H2O}n(6) and [Al(L2)2]?Cl?2H2O(7), which contain non-noble metal ions, inclouding cobalt(Ⅱ), copper(Ⅱ), aluminum(Ⅲ) and cadmium(Ⅱ),then synthesised by solvo thermal methold.Their structures and properties have been characterized by single-crystal X-ray diffraction analysis, element analysis, X-ray diffractions(PXRD), IR and thermal analysis. Secondly, we study the photocatalystic properties of compounds [Co3(L1)2]?DMF(2) and [Cu(L2)]?H2O}n(4) under the condition of visible light. We achieved photocatalystic H2 production under the visible light using Complex [Co3(L1)2]?DMF(2), Eosin Y dye(EY2-) and triethylamine(TEA) as photo-catalyst, photosensitizer, and electron donor, respectively. At the same time we select the optimal condition, the maximum amount of H2 generated was 6983 μmol/g, the lifetime of the photocatalytic hydrogen production system is about 3 hours. Then, use complex [Cu(L2)]?H2O}n(4) as a catalyst, Eosin Y dye(EY2-) as photosensitizer, triethanolamine(TEOA) as electron donor, to build a three components heterogeneous photocatalytic hydrogen production system. It is the first time using complex contains copper ions as catalyst of photocatalytic hydrogen production system, achieved photocatalystic H2 production under the visible light by water splitting. Through the optimization of H2 production conditions, after five hours the maximum amount of H2 generated was 197.37 μmol in the heterogeneous photocatalytic hydrogen production system. It is demonstrated that complex [Cu(L2)]?H2O}n(4) is stable in photocatalytic hydrogen production system through a series experiments.