Effect of chelating agent (1,10-phenanthroline) on potassium hydrogen phthalate crystals |
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| Authors: | S P Meenakshisundaram S Parthiban G Madhurambal SC Mojumdar |
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| Institution: | (1) Department of Chemistry, Annamalai University, Annamalainagar, 608 002, India;(2) Department of Chemistry, ADM College for Women, Nagapattinam, India;(3) Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College St., Toronto, ON, M5S 3E5, Canada;(4) University of New Brunswick, Saint John, NB, E2L 4L5, Canada |
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| Abstract: | The influence of a new organic additive, chelating agent 1,10-phenanthroline (Phen) (∼5.0·10−3 M L−1) on potassium hydrogen phthalate (KHP) single crystals at 30° is investigated. The crystals were grown from the aqueous solutions
of pH ∼4.5 at constant temperature by solvent evaporation technique. The chelating agent leads to an increase in metastable
zone width and assists the bulk growth process. The growth rate of crystals in the presence of Phen decreases considerably
with an increase in impurity concentration. Not much variation is observed in FTIR and cell parameter values, determined by
XRD analysis. It appears that the growth promoting effect (GPE) of Phen is caused by the adsorption of the organic additive
on the prism of KHP crystals. Differential scanning calorimetry (DSC) and TG-DTA studies reveal the purity of the sample and
no decomposition is observed up to the melting point. Scanning electron microscope (SEM) photographs exhibit the effectiveness
of the impurity in changing the surface morphology of KHP crystals. Contrary to expectations, Phen depresses the NLO efficiency
of KHP, suggesting that the molecular alignments in the presence of Phen results in cancellation effects disturbing the non-linearity. |
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| Keywords: | KHP non-linear optical materials organic dopants TG-DTA XRD |
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