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Many of the world’s greatest problems could be solved with readily available and inexpensive energy, provided that these new resources do not contribute to global warming. The 2008 Climate Change Act requires at least 20% reduction in greenhouse gas emissions from the 1990 baseline in the EU by 2020.[1] Two strategies could be envisaged to address this demanding and challenging requirement; (a) alternative clean energy sources (such as photocatalytic and electrocatalytic H2 generation)[2] and (b) reducing energy consumption (development of energy-efficient, inexpensive Solid-State Lighting (SSL) devices).[3] In this respect, Ru(II) based chromophores based on strongly donating bidentate and tridentate ligands will be developed to address the issue of excited state lifetime. H2 evaluation reaction (HER) using [Ru(bpy)2(dicarboxamide-bpy)]+ (where bpy = 2,2'-bipyridine and dicarboxamide-bpy = N4,N4'-diphenyl-[2,2'-bipyridine]-4,4'-dicarboxamide) as the photosensitizer, Co(dmgH)2-based catalyst (dmgH = dimethylglyoxime), triethanolamine as the electron donor and HBF4 as the proton source will be presented. These data will be compared to that using the prototype [Ru(bpy)3]2+ (Figure 1). In an electrocatalytic HER, development of emissive Pt-molecular square and its use in acidic aqueous media will be discussed. Apart from this ‘light-in-energy-out’ approach the opposite concept of ‘energy-in-light-out’ approach (SSL) includes design and syntheses of light-emitting Ir(III) N-heterocyclic carbene complexes and blue-emissive Co(III) polypyridyl complexes. Results will also be presented using these complexes for applications in organic light emitting diode (OLED) and photoredoxcatalysis. |