Nonlinear optical chromophores with isoquinolines, thieno[2,3-c]pyridines and 2-(2′-thienyl)pyridines as inherently polarized π-electron bridges

The synthesis and first hyperpolarizabilities of a series of isoquinolines and isoquinolinium salts, and also thienopyridines, thienylpyridines, and the corresponding pyridinium salts, determined by hyper-Rayleigh scattering in solution at 1064 and 1300 nm, are reported, These chromophores exhibit markedly high beta values, some of them show absorption maxima well below 400 nm, enabling their use in blue transparent frequency doubling devices, We have performed X-ray structure analyses for thienopyridines 13a,c.