This paper describes the development and creation of a new sensitive optical sensor that is quite selective to Hg(II) ions in aqueous solution. The sensing element, the newly synthesized methyl 2-[3-(3-methylphenyl)-2-triazen-1-yl]benzoate, incorporated into a plasticized poly(vinyl chloride) membrane, is able to determine Hg(II) ion with a high selectivity over a wide dynamic range from 5.0-115.1 μg L -1 at pH 7.5 with a lower detection limit of 0.67 µg L -1 . The response of the optode membrane to Hg(II) was fully reversible and revealed a very good selectivity towards Hg(II) ion from a wide variety of other metal ions in solution. The overall performance characteristics of the sensor were evaluated and good reversibility, wide dynamic range, long life span, long-term response stability and high reproducibility were found. The proposed optical sensor gives proper results in applications including direct determination of the Hg(II) ion in real environmental samples.

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In this research, 1-(2-methoxyphenyl)-3-(4-chlorophenyl) triazene was studied as a compound with high nonlinear optical properties for use in optical devices. For this purpose, the compound was synthesized and its structure was identified by melting point and infrared and nuclear magnetic resonance spectroscopy. Then, the bandgap energy of the title compound was determined to be 2.4 eV using the Tauc relation. Density functional theory and time-dependent methods were used for calculations of magnetic moment, natural band orbital, analysis of frontier molecular orbitals, first and second order hyperpolarizability. The results showed a dipole moment of 2.45 Debye for the molecule. The calculation of the hyperpolarizability showed the values of −109.6, 128.9 and −3694 a.u. for the first, second and third order polarizability respectively. Finally, the experimental and computational results showed that the compound has significant nonlinear optical properties and will be suitable for nonlinear optics studies and applications in optical devices.