Executive Summary : | Solar light is a renewable source of energy which is non-toxic, non-polluting and abundantly available. Harnessing solar light as a renewable energy source will be substantial in terms of safety, energy efficiency and economic sustainability. However, most small organic molecules are incapable of absorbing visible wavelength of light, rendering the need for an external chromophore. Precious metal (Ru or Ir) based organometallic complexes and organic dyes has been widely explored as photosensitizers. Yet, these photocatalyst are limited by their metal-toxicity, dearth, cost-effectiveness or poorer photo-stability (organic dyes). The recent efforts to replace rare-earth and precious metals has led researchers to explore earth-abundant first row transition metals. Copper(I) complexes exhibit an interesting MLCT excited state, but are again limited by short lifetime of their excited state. The use of rigid and encaging ligands can, however, lead to copper(I) complexes with relatively long excited state life time. Therefore, the design and synthesize of novel copper(I) complex with higher excited state life time is of utmost urgency. Henceforth, pyrene-based N,N-ligands will be prepared with the aim to extend the excited state lifetime of copper(I) complexes. Strategically, the reaction of pyrene-2,2-dioxide with aryl amines will provide pyrene-based N,N-ligands. The objective here, however, is to design the pyrene-based N,N-ligands containing bulky substituents which may effectively counter the flattening distortion responsible for the shortened excited state lifetime of copper(I) complexes. The photophysical studies of the prepared copper(I) complexes will be investigated, which will allow for its exploration in photocatalytic reactions. The last decade has also witnessed a great many advances in visible light induced organic synthesis. The benefit of using visible light arise from the fact that it is mild, non-toxic, economic and environmentally benign, allowing the realization of elusive organic reactions. Hence, the synthesis of novel heterocycles using this benign strategy is considerable. The sultone scaffold is of great importance showing inhibitory action against human cytomegalovirus (HCMV), human immunodeficiency virus type 1 (HIV-1) etc. They are also valuable synthetic intermediates in organic synthesis and natural products. Thus, the construction of seven membered N- and S-heterocyclic sultones employing the novel copper(I) complexes under visible light irradiation will be extremely impactful. We envision that the construction of such heterocycles will be effected by ATRA addition of trifluromethylsulfonyl chloride to 2-(allylthio)phenol or 2-(allylalkylamino)phenol. After, ATRA addition, it will undergo spontaneous cyclization to furnish the novel seven membered N- and S-heterocyclic sultones. We envisage that these novel heterocycles will leave a scope for further exploration in the arears of material, medicinal and electronic devises. |