A Schiff base, namely,
4-[(2-hydroxy-3-methoxybenzylidene) amino]
benzoic acid (L1), has been synthesized by the condensation
reaction. It has been characterized by Fourier transform infrared
spectroscopy , UV–vis spectroscopy, single-crystal X-ray diffraction,
and DFT/B3LYP calculations. Single-crystal X-ray crystallographic
analysis revealed that L1 exists in the zwitterionic
(N–H···...O) form. The supramolecular interactions
were investigated by Hirshfeld surface analysis. In addition, third-order
nonlinear optical (NLO) properties of L1 were also investigated.
The nonlinear refractive index (n2), nonlinear absorption
coefficient (β), and the third-order NLO susceptibility (χ(3)) have been estimated at different concentrations and at
different laser powers using close and openaperture Z-scan data. The
values of the parameters were found to be varying almost linearly
with concentration and power. The present study revealed the utility
of the material for various optoelectronic devices such as optical
switches, optical data storage devices, and optical sensors. The optical
limiting study reveals that this material can also be exploited as
an instrument protector from unwanted laser illumination. Furthermore,
the NLO behavior of L1 has also been studied by B3LYP/6-311++G(d,p)
results.
A mononuclear Zn(II) complex of (Zn(H2L) (CH3OH) Cl2) (1) has been synthesized by using a nonlinear optically active Zwitterionic Schiff base which is 4-((2-hydroxy-3-methoxybenzylidene) amino) benzoic acid (H2L). Complex 1 has been structurally analyzed by FTIR and UV spectroscopy, TGA, Powder-XRD and single crystal X-ray diffraction. X-Ray crystallographic studies revealed Zn(II) complex crystallizes in a P21/c space group and exists in a distorted trigonal bipyramidal geometry (τ = 0.68). The topological analysis of complex 1 showed that the underlying net is characterized by an unknown topological type and point symbol {342.468.510}, and multilevel analysis of complex packing as dimer gives a 18-c uninodal net with unknown topological type and point symbol {348.499.56}. The calculation results of a Hirshfeld surface analysis have been investigated to explore the H-bonding within the crystal. Third-order non-linear properties were also studied, which revealed that the lower input power (5.0 mM) for the material shows full transparency; however, it becomes opaque for higher input power. Such limiting behavior of complex 1 suggests its potential for instrumental protective devices against high laser illuminations.
This work focuses on the study of a proton‐transfer complex (1) of 5‐hydroxy‐isophthalic acid (HIPA) and 3,3′‐(piperazine‐1,4‐diylbis(methylene)) dibenzonitrile (PBN). The single‐crystal XRD reveals that the HIPA and PBN molecules in complex (1) are mutually connected through intricate N+−H−O− H‐bonding interactions. Herein, close and open aperture measurement for the third‐order nonlinear optical response of the complex (1) has been investigated using the Z‐scan technique which shows its potential application in optoelectronic and photonic devices. Further, DFT calculations have been done for the HOMO‐LUMO energy gap and Mulliken atomic charge analysis which helps us to understand the proton‐transfer mechanism in the complex (1). The topological and Hirshfeld surface analysis were also achieved to understand the importance of non‐covalent interactions in the stability of the supramolecular structure and NLO properties.
In the present decade, the advancement in photonic applications has stimulated the scientific community to explore nonlinear optical characteristics of optical materials. The present report on the synthesized proton-shifted monohydrated organic salt (ABMPP) of 2-Amino-5-bromo-6-methyl-4-pyrimidinol (ABMP) and 2,3-pyrazinedicarboxylic acid (PDCA) explores the linear and nonlinear optical (NLO) characteristics. The linear optical characteristics of ABMPP dissolved in DMSO have been investigated using the recorded absorption and photoluminescence spectra. In addition, the 1 H-NMR analysis has been executed for structural characteristics. The third-order nonlinear optical characteristics of the sample have been measured using the Z-scan technique with a 520 nm laser beam of CW diode laser. The coefficients of nonlinear absorption (b), nonlinear refraction (n 2 ) with nonlinear optical susceptibility, v (3) , and second-order hyperpolarizability (c) have been estimated for various solution concentrations and laser powers. The evaluated b, n 2 , v (3) , and c are found to be of the order of 10 -4 cm/W, 10 -8 cm 2 /W, 10 -6 esu, and 10 -26 esu, respectively, and these parameters vary linearly with solution concentration as well as laser power. The NLO performance of the ABMPP compound reveals its potential in photonic and optoelectronic applications. Furthermore, the compound has been also assayed for optical limiting characteristics with the same radiation and it shows comparatively better limiting performance. Hence this material could be a viable candidate for optical limiting devices.
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