Green synthesis,molecular docking and pharmacological evaluation of new triazolo-thiadiazepinylcoumarine derivatives as sedative-hypnotic scaffold

4-Amino-5-mercapto-4H-1,2,4-triazole derivative 1 was used as a key intermediate for the preparation of 1,2,4-triazolo[3,4-b][1,3,4]thiadiazepine derivatives 5a-d , 12a-g , and 16 via reactions with the appropriate chalcones 2a-d , α,β-unsaturated carbonitrile derivatives 9a-g and 13 , respectively. The identity of the synthesized compounds was elucidated via their spectral data and elemental analysis. Moreover, the sedative-hypnotic activity of the newly synthesized compounds were evaluated and showed excellent activities especially compounds 12b , 12f , and 16 . Also, their structure activity relationship (SAR) was clearly demonstrated and showed that the electron-donating groups enhance activities while electron-withdrawing groups decrease activities. The molecular docking of the most active derivative 16 against γ-amino butyric acid (GABA) receptor was performed by the MOE 2014 0901program. The acquired outcomes demonstrated that the most active compounds could be a helpful model for future structure, adjustment, and examination to build more active analogs.     

Charge Transfer Complexes of Some Heterocyclic Aromatic Amines with π‐Organic Acceptors in Polar Solvents

A conductometric titration technique has been used to investigate the electron transfer activity of CT molecular complexes formed by arylazopyrimidine and naphthylazopyrimidine derivatives as donors and the organic π‐acceptors p‐nitroaniline, p‐chloroaniline, p‐bromoaniline, anthraquinone, picric acid, α‐nitroso‐β‐naphthol, p‐hydroxybenzaldehyde and maleic anhydride. The study was performed at different degree of temperature and in three different polar solvents namely N,N‐dimethylformamide (DMF), acetonitrile (ACN) and dimethylsulfoxide (DMSO). The stoichiometric ratios of these complexes were found to be 1:1. The dissociation constant (ασ_M) values of the formed complexes have been calculated, and the effects of solvents as well as types of electron donors on their conductance σ_p‐values have been examined.     

Suspended stripline low pass filters design using the TLM method

This work presents the design of a Suspended Stripline Low-Pass filter using an Electromagnetic simulation software based on tridimensional TLM method. The filter design procedure is shown and discussed, as well as the optimization using the TLM. Theoretical, simulated and experimental results are compared.     

Quantum Mechanics of Two-Field Parametric Frequency Converter Interacting with a Single Atom

In this communication we deal with a new model Hamiltonian representing the interaction between a two-level atom and two electromagnetic field modes in a cavity. The interaction between the modes has been taken into account and considered to be of a parametric frequency converter type. The model can be regarded as a generalization of two different systems: the Jaynes–Cummings model (atom–field interaction) and the two-mode frequency converter model (field–field interaction). Under a certain condition an exact solution for the equations of motion in the Heisenberg picture is given. The wavefunction in the Schrödinger picture is also constructed and used to discuss some statistical properties related to the model. We assume that the fields are initially in coherent states. We discuss atomic inversion, photon number distribution, squeezing and other phenomena. We show in all cases that the system is very sensitive to any variation in the mean photon numbers.     

Thermal decomposition study of cobalt(II)-mixed ligand complexes with aliphatic or aromatic dicarboxylic acids and imidazole

The thermal decomposition study of Co(II)–malate, tartarate and phthalate complexes with imidazole was monitored by TG, DTG and DTA analysis in static atmosphere of air. The complexes and their calcination products were characterized by IR spectroscopy. The decomposition course and steps were analyzed and the kinetic parameters of the non-isothermal decomposition were calculated. The results revealed that the decomposition processes of these complexes are the best described by a random nucleation mechanism. The stability order found for these complexes follows the trend tartarate>phthalate>malate in terms of the dicarboxylic acid ligands.     

Oxidative coupling for the spectrophotometric determination of certain cephalosporins and acetaminophen in drug formulations

A spectrophotometric method for the determination of some cephalosporins and acetaminophen is described. The method is based on the hydrolysis of the cephalosporin in sodium hydroxide solution to produce the sulphide ion and the conversion of the sulphide with the p-phenylenediamine to form a violet colour. Acetaminophen is hydrolysed in sulphuric solution and the resulting p-aminophenol is oxidized with sulphide ion in the presence of iron(III) to form a red product. The method has been successfully applied to the assay of some cephalosporins and acetaminophen in drug formulations.     

Nonclassical Properties of Squeezed Finite-Dimensional Pair Coherent State

We study the effect of the squeeze operator on the finite pair-coherent state. The state is a type of a correlated two-mode state in finite dimension based on the resonant ion-cavity interaction. We have discussed some statistical properties for such state, especially the quadrature variances as well as the second-order correlation function. Furthermore we have also considered the variance in the photon number sum and difference in addition to the linear correlation function. It is shown that the strong correlation occurs for a large value of the photon number difference. Our discussion is extended to include the quasiprobability distribution functions (W-Wigner and Q-functions). In the meantime we have considered the quadrature distribution function and phase distribution. It has been shown that the squeezed finite pair coherent state is sensitive to the variation in the state parameter, ξ and the squeeze parameter, r, as well as the q parameter which in fact plays a crucial role of controlling the behavior of the system.     

Autocorrelation function for a two-level atom “with counter-rotating terms”

We study the statistics of the emitted light from a single two-level atom in a cavity. We explore the effects of counter-rotating terms. We show that the virtual processes destroy the antibunching effect in the low-frequency regime.     

1,2-Naphthoquinone-4-Sulphonic Acid Sodium Salt (NQS) as an Analytical Reagent for the Determination of Pharmaceutical Amine by Spectrophotometry

Abstract: Several papers have been presented in recent years regarding the field of application of 1,2-naphthoquinone-4-sulphonic acid sodium salt (NQS) as a chromogenic reagent for the determination of pharmaceutical amines using spectrophotometry. In this review article, various spectrophotometric methods using NQS as a labeling reagent for determination of pharmaceutical amines are presented. The application of these methods for the determination of drugs in pharmaceutical formulations and real samples is discussed.     

1,2,4-Oxadiazole ring–containing pyridylpyrazole-4-carboxamides: Synthesis and evaluation as novel insecticides of the anthranilic diamide family

Herein, we describe the preparation of pyridylpyrazole-4-carboxamides containing a 1,2,4-oxadiazole ring as novel anthranilic diamide derivatives and compare their insecticidal activities to that of chlorantraniliprole, a well-established potent insecticide. Biological activity tests reveal that all compounds had good insecticidal activities, with the most potent species achieving diamondback moth (Plutella xylostella) mortalities of 100% and 57% at concentrations of 400 and 200 μg mL⁻¹, respectively.