Structural, thermal, optical and nonlinear optical properties of ethylenediaminium picrate single crystals

• Published in: The Journal of physics and chemistry of solids 2017-07, Vol.106, p.37-43
• Main Authors: C., Indumathi, T.C., Sabari Girisun, K., Anitha, S., Alfred Cecil Raj
• Format: Article
• Language: English
• Subjects: NMR; Optical limiting; Raman; TG-DTA; XRD; Z-scan
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2017.03.003

A new organic optical limiting material, ethylenediaminium picrate (EDAPA) was synthesized through acid base reaction and grown as single crystals by solvent evaporation method. Single crystal XRD analysis showed that EDAPA crystallizes in orthorhombic system with Cmca as space group. The formation of charge transfer complex during the reaction of ethylenediamine and picric acid was strongly evident through the recorded Fourier Transform Infra Red (FTIR), Raman and Nuclear Magnetic Resonance (NMR) spectrum. Thermal (TG–DTA and DSC) curves indicated that the material possesses high thermal stability with decomposition temperature at 243°C. Optical (UV–Visible-NIR) analysis showed that the grown crystal was found to be transparent in the entire visible and NIR region. Z-scan studies with intense short pulse (532nm, 5ns, 100µJ) excitations, revealed that EDAPA exhibited two photon absorption behaviour and the nonlinear absorption coefficient was found to be two orders of magnitude higher than some of the known optical limiter like Cu nano glasses. EDAPA exhibited a strong optical limiting action with low limiting threshold which make them a potential candidate for eye and photosensitive component protection against intense short pulse lasers. [Display omitted] •Ethylenediaminium picrate (EDAPA) was synthesized and grown as single crystals by solvent evaporation.•EDAPA crystallizes in orthorhombic system with Cmca as space group.•The formation of charge transfer complex and molecular arrangement was studied by vibrational spectroscopy.•EDAPA exhibits two photon absorption action under short pulse laser excitation (532nm, 5ns, 10Hz, 100µJ).•EDAPA possess high nonlinear absorption co-efficient of 1.80×10−10m/W and low limiting threshold of 2.5×1012W/m2.