International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
Growth and characterization of Guanidine benzoate (GuBzt) single crystals D. Sathya1, V. Sivashankar2, D. Prem Anand3 1,2,3Department
of Physics, St.Xavier’s College, Palayamkottai-627002, Tamil Nadu, India email: tvsivashankar@yahoo.co.in, devarajanpremanand@gmail.com ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract- The new organic single crystal Guanidine
Benzoate (GuBzt) is grown by slow evaporation method. Optical transparency of the (GuBzt) single crystals measured by UV - Vis spectrum shows the cutoff frequency at 296 nm. Dielectric constant and refractive index of the GuBzt single crystals are also calculated. X- ray diffraction studies showed that GuBzt crystallizes in orthorhombic, Pnma space group. Key Words: GuBzt, UV-Vis, Dielectric, X- ray diffraction Pnma
1. INTRODUCTION Guanidine carbonate and benzoic acid have been taken into consideration to grow the organic single crystals. Organic compound of Guanidine carbonate is one among the special product, inspite of its enormous application in the fields of biomedical, cosmetics, detergents, microencapsulation process, optoelectronic and telecommunication etc. Guanidinium ion is relatively simple chemical species, whose structure is related to those of amides and proteins in which there is considerable interest. The guanidinium ion can form a broad family of hydrogen bonded crystals [1]. Guanidine tartarate [2], guanidine acetate [3], guanidine maleate [4] has been chosen, previously for the study as the potential material for nonlinear optics. These crystals belong to noncentrosymmetric space group and also the nonlinear optical (NLO) response was observed. From the NLO response Guanidine based materials exhibits Strong NLO efficiency. In this strategy, Benzoic acid is taken into account. It is one of the amino acids and it plays a very important role in crystal growth because of its donor carboxyl group and amino acceptor group [5, 6]. The acidic carboxyl group can undergo reactions to form products such as salts, acid halides. Since, all H atoms of the guanidinium cations are involved in N—H···O interactions with the benzoic acid, each carboxylate O atom accepting three H atoms. In each layer, © 2017, IRJET
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the cation is bonded to three anions to form guanidine benzoate single crystals [7]. The crystal structure of GuBzt single crystals have already been reported [8]. Hence, this article mainly focuses the optical properties of the title compound explained via linear optical study, UV – Vis spectrum which gives the optical transmission and bandgap. In addition, refractive index and dielectric constant of the GuBzt single crystals has also been studied using UV- Vis spectrum and the respective results are discussed.
2. EXPERIMENTAL PROCEDURE 2.1Crystallization method Guanidine benzoate single crystals are synthesized by slow evaporation method. Commercially available AR grade Guanidinium carbonate (Himedia) and benzoic acid in stoichiometric 1:1 ratio are used to synthesize Guanidine benzoate single crystals. The calculated amount of Guanidinium carbonate is dissolved in deionized water, benzoic acid is then added to the solution slowly by stirring. To remove the contaminations, the stirred solution is filtered using wattmann filter paper and allowed to dry in room temperature for evaporation. The colorless, transparent crystals are of size 10 x 8 x 5 mm3 obtained after 18 days of the growth as shown in Fig.1.
2.2 Characterization The powder X-ray diffraction pattern is obtained by SHIMADZU model XRD 6000 instrument with CuKα radiation (λ=1.54060 Ǻ). X- ray diffraction data are collected using an ENRAF NONNIUS- CAD 4 single crystal X- ray diffractometer with MoKα (λ= 0.71073 Å) radiation at room temperature. The UV-Vis-IR transmission spectrum is recorded in the range of 200 - 1200 nm using SHIMAZLER 2410 UV spectrometer. FT-IR spectrum is recorded using BRUKER IFS-66V spectrometer in the range between 4000 and 400Cm-1. ISO 9001:2008 Certified Journal
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