Abstract
The design and development of metal complex architecture with a multidenate heterocyclic organic compound that modulates hydrogen evolution from water. To achieve effective hydrogen evolution efficiencies of metal chelates bearing Phenanthroline scaffold, [ML].2(OAc) (L-1,10-Phenanthroline analogous contains aromatic core; M = Co, Zn, Cu & Ni ions) were designed and synthesized. A square-planar arrangement with moderate distortion was attributed to the above metal chelates based on spectroscopic data and analytical studies. The experimental observations highlighted that metal chelates were effective towards hydrogen evolution under photochemical and electrocatalytic condition. During the photochemical process, the metal chelate was combined with fluorescein (photosensitizer) and triethylamine (sacrificial e-donor) showed enhanced hydrogen evolution under photochemical irradiation that correlates with electronic and conjugation of ligand. Copper complexes with the highest TON and TOF values (11,500 and 7800) had the best catalytic activity at pH 10.6 in CH 3 CN:H 2 O (1:1 ratio). All of the promising findings offers novel paths for hydrogen production with chromophores and metal catalysts. Due to its abnormal synergistic behavior imparts the potential of redox characteristics, metal ions with highly conjugated ligands showed hydrogen production with impressive results. This research could pave the way for the growth of metal complex as hydrogen generation catalysts. • Highly conjugated metal complexes were prepared and characterized. • Copper complex is low cost, robust, and highly efficient for the reduction of water into hydrogen. • Copper complex showed higher efficiency for generation of hydrogen (TON, TOF are 11,500 & 7800). • Due to its abnormal synergistic behavior modulates redox potency of copper complex with enhanced H 2 generation efficiency.
Published Version
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