Publications

Influence of alkali activators on thermo-physical properties of ecofriendly unfired clay bricks from anthill mounds

This experiment studied the effect of alkali activators on clay from anthill mounds which was blended with a small proportion of cement to develop eco-friendly unfired bricks. Physical, wet and dry compressive strength tests were investigated and the results were analysed using one-way ANOVA. Thermal conductivity and thermal diffusivity of the unfired bricks were also studied using Hot Disc Thermal Constant Analyzer. The microstructures of the unfired bricks were also analysed with scanning electron microscope equipment. The results of the physical tests were significantly higher at p < 0.05 for unfired bricks made up of 0.5% and 1% weights of calcium chloride and sodium hydroxide at a constant value of 1% weight of sodium silicate more than those made from other amounts of activators. The thermal performance values showed that the bricks are good insulators and could be used for the construction of structure requiring little thermal fluctuations. The study has shown that improved environment-friendly unfired clay bricks could be developed from the mixture of clay samples sourced from anthill mounds and alkali activators in addition to a little proportion of cement. These could be suitable for the construction of grain silos, low-cost structures and short-term shelters in low-income countries.

Designed network of ternary core-shell PPCOT/NiFe2O4/C-SWCNTs nanocomposites. A Selective Fe3+ ionic sensor

1,3-Diethyl-5-(2-methoxybenzylidene)-2-thioxodihydropyrimidine-4,6(1H,5H)-dione

1,3-Diethyl-5-(2-methoxybenzylidene)-2-thioxodihydropyrimidine-4,6(1H,5H)-dione 3 was prepared by Knoevenagel condensation of 2-methoxybenzaldehyde 1 and N,N-diethylthiobarbituric acid 2 in ethanol using piperidine as a base [1,2].[...]

Organometallic dyes: Part 1. Synthesis of orange to cyan dyes based on donor–conjugated–acceptor chromogenes using ferrocene as the donor group

Abstract A novel series of organometallic donor–conjugated–acceptor dyes derived from ferrocene as the donor group have been synthesized via the Knoevenagel reaction of ferrocene carboxaldehyde and various active methylene compounds to give a range of dyes ranging from orange to blue–green in color. The most bathochromic dye is that derived from dialkyl thiobarbituric acid and the least is that derived from the tetralone. The dyes showed an unusual negative solvatochromism as the solvent polarity increased. All dyes synthesized are expected to have some non‐linear optical properties, as evidenced from the pronounced solvatochromism. Copyright © 2001 John Wiley &amp; Sons, Ltd.

CCDC 1422691: Experimental Crystal Structure Determination

CCDC 976283: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Synthesis, Single X-ray Crystal, Spectroscopic and Photophysical Studies of Novel Heterocyclic Chalcones with Their Biological Application

The electro-optical and charge transport study of imidazolidin derivative: Quantum chemical investigations

Imidazolidin derivatives gained significant attention in our daily life from better biological activity to the semiconducting materials. The present investigation deals with the in depth study of (Z)-2-sulfanylidene-5-(thiophen-2-ylmethylidene)imidazolidin-4-one (STMI) with respect to their structural, electronic, optical and charge transport properties as semiconducting material. The ground and first excited state geometries were optimized by applying density functional theory (DFT) and time dependent DFT, respectively. The light has been shed on the frontier molecular orbitals (FMOs) and observed comprehensible intramolecular charge transfer (ICT) from the highest occupied molecular orbitals (HOMOs) to the lowest unoccupied molecular orbitals (LUMOs). The absorption, emission, ionization potentials (IP), electron affinities (EA), total and partial densities of states and structure-property relationship have been discussed. Finally, hole as well as electron reorganization energies, transfer integrals and intrinsic mobilities have been calculated then charge transport behavior of STMI was discussed, intensively.

5-Acetyl-3-(5-phenyl-1<i>H</i>-pyrazol-3-yl)-1,3,4-thiadiazol-2(3<i>H</i>)-one monohydrate

In the title hydrate, C13H10N4O2S·H2O, the dihedral angles between the central pyrazole ring and its pendant phenyl and thia-diazole rings are 9.93 (8) and 4.56 (7)°, respectively. In the crystal, the components are linked by N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds, generating [100] chains incorporating R 4 (4)(10) loops. A weak C-H⋯O inter-action helps to consolidate the packing.

One pot synthesis, physicochemical and photophysical investigation of biologically active pyridine-3-carboxylate (ECPC) as probe to determine CMC of surfactants in organized media

Synovial Fluid Lactate for the Diagnosis of Joint Infection:A Systematic Review

Magnetic and catalytic properties of inverse spinel CuFe2O4 nanoparticles

Band Engineering of Semiconducting Microporous Graphitic Carbons by Phosphorous Doping: Enhancing of Photocatalytic Overall Water Splitting

Carbon-based solar photocatalysts for overall water splitting could provide H₂ as an energy vector in a clean and sustainable way. Band engineering to align energy levels can be achieved, among other ways, by doping. Herein, it is shown that phosphorous doping of microporous graphitic carbons derived from pyrolysis of α-, β-, and γ-cyclodextrin increases the valence band edge energy of the material, and the energy value of the conduction band decreases with the P content. In this way, P doping increases the activity of these metal-free materials in photocatalytic overall water splitting under simulated sunlight and visible-light illumination. The optimal P-doped photocatalyst in the absence of any metal as a cocatalyst affords, after 4 h of irradiation with simulated sunlight, a H₂ production of 2.5 mmol of H₂ × g_catalyst^-1 in the presence of methanol as the sacrificial agent or 225 μmol of H₂ × g_catalyst^-1 from pure H₂O.

Multistep Synthesis and Photophysical Investigation of Novel Pyrazoline, a Heterocyclic D-π-a Chromophore (PTPB) as a Fluorescent Chemosensor for the Detection of Fe³⁺ Metal Ion

A pyridine-pyrazoline (2-(3-(pyridin-2-yl)-5-(3,4,5-trimethoxyphenyl)-4,5-dihydro-1H-pyrazol-1-yl)benzo[d]thiazole) (PTPB) has been designed and synthesized by the reaction of chalcone with 2-hydrazinylbenzo[d]thiazole. PTPB was further conformed by the FT-IR, 1H-NMR and 13 F. Ran, Y. Liu, D. Zhang, M. Liu, and G. Zhao, “Discovery of Novel Pyrazole Derivatives as Potential Anticancer Agents in MCL,” Bioorganic and Medicinal Chemistry Letters 29, no. 9 (2019): 1060–4.[Crossref], [PubMed], [Web of Science ®] , [Google Scholar]N-NMR spectroscopic techniques. The solvatochromic behavior of PTPB with electron donating and accepting group was investigated in nonpolar, polar aprotic and protic solvents experimentally. The photophysical behavior of the PTPB in different solvent was attributed to the intramolecular charge transfer (ICT) of the compound along with specific and nonspecific interaction with different solvents. On view of the effect of different type of interaction on the photophysical parameters such as stokes shift, dipole moment oscillator strength and fluorescence quantum yields have been calculated with respect to polarity of the solvent. In addition, pyridine-pyrazoline (PTPB) can use as fluorescent chemosensor to determine the Fe3+ metal ion with high selectivity among the series of cations in aqueous dimethylformamide (DMF). The recognition mechanism of PTPB toward Fe3+ has been investigated in detail by Benesi–Hildebrand, Stern–Volmer and job’s plot measurements and PTBP forms 1:1 complex with Fe3+ metal ion and displays fluorescent quenching behavior.

Recent developments in the diagnosis and treatment of Addison's disease

Primary adrenal insufficiency (PAI), also referred to as Addison's disease (AD), is a rare but potentially life-threatening disorder marked by a deficiency in the production of hormones by the adrenal cortex. Despite significant advancements in diagnosis and treatment, challenges remain, particularly in pediatric cases where diagnostic delays are common. Autoimmune adrenalitis is the leading cause of AD in adults, while congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency is the primary cause in children. Recent developments include dual-release hydrocortisone formulations designed to mimic circadian rhythms and improve patient outcomes, as well as continuous subcutaneous cortisol infusion using insulin pumps. Experimental therapies, such as immunosuppression, gene therapy, and cell replacement, are in early stages of research. Management focuses on hormone replacement therapy and preventing adrenal crises, often triggered by infections or surgery. Education on crisis prevention is crucial, and patients should regularly monitor hormone levels. Advances in treatment aim to improve quality of life, yet more research is needed to refine therapeutic approaches and long-term outcomes.

Facile Synthesis and Crystal Stuructures of New Ammonium Sulfonates (CA-DNBS and TEA-TMBS)

The title compounds,C_(12)H_(10)N_3O_7SCl(I) and C15H27NO3S(n),crystallize in the monoclinic system,space group P2_(1/c) with a=7.3995(1),b=27.8489(6),c=9.8246(2) A,β= 131.349(1)°,V=1519.82(5) A~3,Z=4,F(000)=768,R_(int)=0.033 and S=1.03 for I,and in the orthorhombic system,space group Pbca with a=8.6227(1),b=16.1480(4),c=23.8774(6) A,V= 3324.67(12) A~3,Z=8,F(000)=1312,R_(int)=0.024 and S=1.04 for II.We have devised a convenient procedure for the synthesis of fused organic salts resulting from 1:1 proton-transfer,using an amine and a derivative of benzenesulfonic acid.The synthesized salts have a number of applications ranging from their consumption as eco-friendly solvents and catalysts in organic syntheses,to being used as efficient precursors for the production of sulfa drugs.Structures of compounds 3-chloroanilinium 2,4-dinitrobenzenesulfonate(CA-DNBS) and triethylaminium 2,4,6-trimethylbenzenesulfonate(TEA-TMBS) were determined by single-crystal X-ray diffraction studies and infrared spectroscopy.

3-Amino-1-(4-bromophenyl)-9,10-dihydrophenanthrene-2,4-dicarbonitrile

In the title compound, C(22)H(14)BrN(3), the fused-ring system is buckled owing to the ethyl-ene linkage in the central ring; the two flanking aromatic rings are twisted by 25.9 (1) ° with respect to each other. The phenyl ring is twisted by 77.0 (1)° relative to the amino- and cyano-bearing aromatic ring. In the crystal, adjacent mol-ecules are linked by two N-H⋯N hydrogen bonds, generating a zigzag chain along [101].

Characterization of a novel natural cellulosic fiber from Calotropis gigantea fruit bunch for ecofriendly polymer composites