Organic mandelates as promising materials with non-linear optical application

The application of organic salts of mandelic acid (MA) as new materials for optical and non-linear-optical (NLO) application is discussed, using four novel organic salts, i.e. pyridinium-4-aldoxime mandelate (1), 1-aminoisoquinolinium mandelate mandelic acid (2), 2-amino-8-hydroxyquinolinium mandelate (3) and phenylalaninamide mandelate monohydrate (4). The crystal structures, optical and NLO properties are studied by the application of single crystal X-ray diffraction, UV–VIS–NIR spectroscopy, conventional and linear polarized infrared (IR-LD) spectroscopy, thermal methods as well as quantum chemical (ab initio and DFT) calculations.