Contribution of environment polarity effects on the nonlinear hyperpolarizability and linear optical characteristics of some phenothiazines

Solvents as complex environments can induce considerable effects on the physical, chemical, and biological properties of solute molecules. In this work, solvent polarity sensitive characteristics of phenothiazines were studied by using spectroscopic technique. In this case, the interactional behavior of selected samples was investigated by Kamlet-Abboud-Taft and Catalan models. Moreover, the results from the spectroscopic technique provide a proper condition for providing a new method for investigation of environment polarity effects on the molecular first and second order hyperpolarizability. According to the results, solute�solvent specific and nonspecific interactions with different contributions tend to modify the value of molecular hyperpolarizability. In this case, the studies on the contribution of various molecular interactions can indicate some advantages such as decreasing the complexity of investigations on the environment polarity effects on the molecular hyperpolarizability and provide an effective method for controlling molecular first and second order hyperpolarizability. Therefore, the results can give useful information about the capability of selected samples for various applications in optics. © 2021 Elsevier B.V

Plasma-based one-step synthesis of tungsten oxide nanoparticles in short time

Abstract Nanostructured tungsten oxide as a semiconductor metal oxide has attracted considerable attention due to its promising and notable properties. Tungsten oxide nanoparticles can be used in a wide range of technology and applications such as catalysts, sensors, supercapacitors, etc. In this study, nanoparticles were prepared via a simple method using an atmospheric glow discharge. This modern approach had many advantages such as high efficiency and straightforward function. Synthesis performance was done in only one step and a short time which started at 2 min and had been continued for 8 min. The X-ray diffraction pattern revealed the formation $${\mathrm{WO}}_{3}$$ WO 3 at atmospheric pressure. The synthesized particle size was characterized using scanning electron microscopy. According to the experimental results, the synthesis was greatly influenced by the applied voltage, gas type, and plasma forming side over the water surface. Increases in electrical potential difference and thermal conductivity of the gas led to a greater rate of synthesis, while this rate was reduced by decreasing the atomic weight of the gas

Investigation on environmental sensitivity characteristics of pyridine compounds with different position of N-atoms and various active functional groups

Environment induced effects including polarity play important role in controlling physical, biological, and chemical behavior of local molecules. In this study, due to the importance of this issue, solvatochromism and charge transfer characteristics of some groups of pyridine compounds were investigated in various environments with different polarity. According to the experimental results, polarity of molecular surrounding environment, position of N-atom in pyridine rings, and various active functional groups have profound effects on the molecular photo-physical features. The contribution of various solvent induced effects on the solvatochromism characteristics of samples were also investigated by using of linear salvation energy relationship concept. Moreover, according to the experimental data and density functional theory calculations, the differences between molecular dipole moment values in the ground and excited states are high enough to increase the probability of charge transfer mechanism. Therefore, from the theoretical calculations and quantitative experimental results of solute-solvent various interactions� contributions, it is possible to estimate the operation of pyridine compounds in various physical, chemical and biological phenomena in the solvent media. © 2018 Elsevier B.V

Cd(II) and Cu(II) coordination polymers constructed from the expanded 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene ligand: conventional and ultrasound-assisted synthesis, crystal structure, luminescence and magnetic properties

A 3D open inorganic/organic framework, {[Cd(mu-L)(mu(3)-SO4)(H2O)]center dot H2O}(n) (1) [L = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene] was synthesized by the reaction of CdSO4 center dot 8H(2)O with L. The treatment of Cu(NO3)(2)center dot 3H(2)O with the same N,N'-donor ligand in two different solvent mixtures, methanol/ dichloromethane (2) and methanol/ chloroform (3), afforded two new ladder-like coordination polymers of formula {[Cu(mu-L)(mu-NO3)(NO3)]center dot solv}(n) [solv = CH2Cl2 (2) and CHCl3 (3)]. The non-interpenetrated ladder motifs 2 and 3 enclathrate the uncoordinated solvent molecules. Crystalline coordination polymers 1 and 3 were also successfully prepared by a sonochemical method under different reaction conditions. Our results indicate that the size of the particles is dependent on the irradiation time. 1 and 3 exhibit intense luminescent emissions in the solid state at room temperature. Cryomagnetic measurements of 3 show the occurrence of a ferromagnetic interaction between the copper(II) ions through the double oxo-nitrate bridge together with a very weak inter-ladder antiferromagnetic interaction [J = +4.93(2) cm(-1), g = 2.10(1) and Theta = -0.567(5) K]