Anion Induced Emission Properties of Butane Bridged Perimidin-3-ium salts

N-heterocyclic carbene (NHC) ligands have provided fertile avenues for the design of numerous effective and robust metal catalysts. Number of NHCs were synthesized and investigated in detail, covering a great variety of their structural and electronic properties through modification of the backbone ring size, incorporation of heteroatoms and the attachment of various functional groups. Notably the most popular NHC scaffolds remains with five-membered heterocyclic rings (imidazolinylidenes, dihydroimidazolinylidenes,etc.). Recently Richeson et al. reported that six-membered perimidine-based carbene ligands can increase steric congestion and electron-donating ability compared to five-membered carbene ligands. Thus the perimidine scaffold has been chosen for this purpose in the present study. For example, Mashima et al. demonstrate first Ir(III) complex encompassing permidine-carbene ligated phenylpyridine ligand in 2010. Another example of permidine-carbene system (Rh(III) complex of N,N’-bis(phoshinomethyl)-dihydroperimidines H2C(NCH2PR2)2C10H6 ) has been reported by Hill et al. in 2012. However, the synthesis and photophysical properties of anion induced emission properties of butane bridged perimidin-3-ium salts have never been investigated as of now. Therefore the thesis aim is to develop the various bis-N-isopropylperimidine based carbene ligands for photophysical applications. Another example of permidine-carbene system (Rh(III) complex of N,N’bis(phoshinomethyl)-dihydroperimidines H2C(NCH2PR2)2C10H6 ) has been reported by Hill et al. in 2012. Perimidine and their derivatives have recently attracted a greater attraction towards pharmacological screening.