Design, synthesis, and anticancer evaluation of N4-substituted thiosemicarbazones derived from ortho- and para-ethoxy-benzaldehydes.

R - C(S) - NH - N = CH - R [R = o-OCHCH & R = CHN (2-EBP), R = o-OCHCH & R = CHNO (2-EBM), R = p-OCHCH & R = CHN (4-EBP), and R = p-OCHCH & R = CHNO (4-EBM)] have been synthesized. The ligands have been verified via various spectroscopic methods such as IR, NMR, etc. Single-crystal X-ray diffraction methods were applied to identify the structure of 4-EBP.

Targeting Glioblastoma: Efficacy of Ruthenium-Based Drugs.

Ruthenium compounds offer improved selectivity and fewer side effects compared to platinum-based drugs in glioblastoma treatment. Insights into their interactions with transferrin suggest targeted drug delivery, while photoactivated chemotherapy is a novel cytotoxic approach in tumor tissues.

Biomolecular Interactions and Anticancer Mechanisms of Ru(II)-Arene Complexes of Cinnamaldehyde-Derived Thiosemicarbazone Ligands: Analysis Combining In Silico and In Vitro Approaches.

Our study focuses on synthesizing and exploring the potential of three N-(4) substituted thiosemicarbazones derived from cinnamic aldehyde, alongside their Ru(II)-(η -p-cymene)/(η-benzene) complexes. The synthesized compounds were comprehensively characterized using a range of analytical techniques, including FT-IR, UV-visible spectroscopy, NMR (H, C), and HRMS. We investigated their electronic and physicochemical properties via density functional theory (DFT).

Copper-mediated cyclization of thiosemicarbazones leading to 1,3,4-thiadiazoles: Structural elucidation, DFT calculations, in vitro biological evaluation and in silico evaluation studies.

Cancer's global impact necessitates innovative and less toxic treatments. Thiosemicarbazones (TSCs), adaptable metal chelators, offer such potential. In this study, we have synthesized N (4)-substituted heterocyclic TSCs from syringaldehyde (TSL1, TSL2), and also report the unexpected copper-mediated cyclization of the TSCs to form thiadiazoles (TSL3, TSL4), expanding research avenues.

Host-guest interactions of coumarin-based 1,2-pyrazole using analytical and computational methods: Paper strip-based detection, live cell imaging, logic gates and keypad lock applications.

A novel Coumarin-based 1,2-pyrazole, HCPyTSC is synthesised and characterized. The chemosensor has been shown to have efficient colourimetric and fluorescence sensing capabilities for the quick and selective detection of fluoride and copper ions. At 376 and 430 nm, the HCPyTSC exhibits selective sensing for Cu and F ions.

Cadmium Exposure and Cardiovascular Diseases.

Cadmium lurks in our food, water, and air silently wreaking havoc on human health. It accumulates in plants and mammals, lasting 25-30 years. Herein, we highlight the potential link between cadmium exposure and cardiovascular disorders in humans.

Pilot Study on the Visualization of Latent Fingerprints and Naked Eye Detection of Hg and Zn Ions in Aqueous Media Using Ninhydrin-Based Thiosemicarbazone.

Here, we described a cheap and effective chemosensor (NHPyTSC) that can distinguish Hg and Zn ions from other metal ions and evaluated this phenomenon using several spectroscopy techniques. With the addition of mercury and zinc ions, the proposed chemosensor in particular showed noticeable changes in color and absorption spectra. Additionally, by including EDTA in the NHPyTSC-Hg and NHPyTSC-Zn solutions, colorimetry readings can be reversed.

Simple Fluorescence Sensing Approach for Selective Detection of Fe Ions: Live-Cell Imaging and Logic Gate Functioning.

A pyrene-based fluorescent chemosensor APSB [-(pyrene-1-ylmethylene) anthracen-2-amine] was designed and developed by a simple condensation reaction between pyrene carboxaldehyde and 2-aminoanthracene. The APSB fluorescent sensor selectively binds Fe in the presence of other metal ions. Apart from this, APSB shows high selectivity and sensitivity toward Fe ion detection.

An Effective Selenium-Based Fluorescence Chemosensor for Selective Recognition of Hg in Aqueous Medium: Experimental and Theoretical Studies.

We introduce a novel selenium-based compound [N-(Phenylcarbamoselenoyl) furan-2-carboxamide] for the optical and fluorimetric detection of Hg in an aqueous medium. The synthesized compound was characterized by different spectroscopic methods. The designed chemosensor FSU has shown a significant fluorescence quenching when Hg ions were added to the sensing medium.

A Highly Fluorescent Pyrene-Based Sensor for Selective Detection Of Fe Ion in Aqueous Medium: Computational Investigations.

In this work, we introduce a highly selective and sensitive fluorescent sensor based on pyrene derivative for Fe(III) ion sensing in DMSO/water media. 2-(pyrene-2-yl)-1-(pyrene-2-ylmethyl)-1H-benzo[d]imidazole (PEBD) receptor was synthesized via simple condensation reaction and confirmed by spectroscopic techniques. The receptor exhibits fluorescence quenching in the presence of Fe(III) ions at 440 nm.

Comparative evaluation of multi-residue methods for analysis of pesticide residues in black pepper by gas chromatography tandem mass spectrometry: critical evaluation of matrix co-extractives and method validation.

A gas chromatography tandem mass spectrometry method was developed for simultaneous determination of 133 pesticides in Black pepper (). QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) sample preparation method is preferred over multistep methods. Extraction was done by using acetonitrile followed by clean up using graphitized carbon, primary secondary amine and octadecyl silica (C).

Synthesis, characterization, theoretical, molecular docking and biological activity studies of Ru(II) (--cymene) complexes with novel aniline substituted aroyl selenoureas.

A sequence of aroyl selenourea ligands ( substituted by aniline and their Ru(II) (--cymene) complexes , [Ru(II) (--cymene) L] (L = monodentate aroyl selenourea ligand) have been synthesized and characterized the composition of the ligands and their metal complexes. The molecular structures of ligand and complex were also confirmed by single XRD crystal method. The single-crystal XRD study showed that aroyl selenourea ligand coordinates with Ru Se novel neutral monodentate atom.

Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection.

Two novel cyclohexyl based thiosemicarbazones, HL and HL, are synthesized and characterized. The anion and cation sensing properties of the two receptors has been unveiled as an effective ratiometric and colorimetric sensor for selective and rapid detection of fluoride, copper and cobalt ions. The HL shows selective sensing towards F and Cu at 429 and 393 nm, whereas, HL can detect F, Cu and Co at 350, 393 and 408 nm respectively.

Colorimetric and fluorimetric response of salicylaldehyde dithiosemicarbazone towards fluoride, cyanide and copper ions: Spectroscopic and TD-DFT studies.

The sensing mechanism of salicylaldehyde phenyldithiosemicarbazone (SDTSC) chemosensor has been investigated by spectroscopic and TD-DFT methods. The SDTSC shows colourimetric and spectral changes towards fluoride, cyanide and copper ions. The interaction between SDTSC with fluoride, cyanide and copper ions was examined through their absorption and fluorescence behaviour, and found that SDTSC has more sensing ability towards Cu ion than CN and F ions.

Multi-ion detection and molecular switching behaviour of reversible dual fluorescent sensor.

The selective chemosensing behaviour of imidazole bisthiocarbohydrazone (IBTC) towards F and Cu are studied via colorimetric, UV-Visible, fluorescence spectra studies, and binding constants were calculated. The H NMR titration study strongly support that the deprotonation of IBTC followed by the hydrogen bond formation via N1H1 and N2H2 protons with fluoride ion. The fluorescence inactive IBTC-Cu complex became fluorescence active in the presence of perchlorate (ClO) ion.

Spectroscopic and TDDFT investigation on highly selective fluorogenic chemosensor and construction of molecular logic gates.

1,5-Bis(2-fluorene)thiocarbohydrazone (FBTC) was designed and synthesized for selective sensing of fluoride and copper ions. The binding constants of FBTC towards fluoride and copper ions have been calculated using the Benesi-Hildebrand equation, and FBTC has more binding affinity towards copper ion than fluoride ion. The H NMR and C NMR titration studies strongly support the deprotonation was taken from the N-H protons followed by the formation of hydrogen bond via N-HF.

Crystal structure of 3-[(E)-(2-hy-droxy-3-meth-oxy-benzyl-idene)amino]-1-methyl-1-phenyl-thio-urea.

In the asymmetric unit of the title compound, C16H17N3O2S, there are two independent mol-ecules (A and B), which show an E conformation with respect to the C=N bond. An intra-molecular O-H⋯N hydrogen bond with an S(6) motif stabilizes the mol-ecular structure. The terminal phenyl and benzene rings are almost orthogonal to each other, the dihedral angle being 87.

Homo- and heteropolynuclear Ni2+ and Cu2+ complexes of polytopic ligands, consisting of a tren unit substituted with three 12-membered tetraazamacrocycles.

Two new polytopic ligands L1 and L2 have been synthesized. They consist of a central tren unit to which three 1,4,7,10-tetraazacyclododecane rings are attached via an ethylene and a trimethylene bridge, respectively. The complexation properties of L1 and L2 towards Cu(2+) and Ni(2+) were studied by potentiometric pH titration, UV-Vis, EPR spectroscopy and kinetic techniques.

A tetracoordinated rhodium aminyl radical complex.

A [16 + 1] valence electron configured rhodium aminyl radical complex could be synthesized and characterized in detail by pulse EPR spectroscopy and DFT calculations. The unpaired electron is delocalized over the metal center and two adjacent nitrogens. H-abstraction reactions from thiols and triethylsilane show that the spin density is predominantly localized on both nitrogens.

Spectral characterization of iron(III) complexes of 2-benzoylpyridine N(4)-substituted thiosemicarbazones.

Three iron(III) complexes (1-3) of 2-benzoylpyridine N(4)-phenyl thiosemicarbazone (HL1) and one iron(III) complex (4) of 2-benzoylpyridine N(4)-cyclohexyl thiosemicarbazone (HL2) were synthesized and characterized by means of different physicochemical techniques viz., molar conductivity measurements, magnetic susceptibility studies and electronic, infrared and EPR spectral studies. The analytical data and the molar conductance measurements of the complexes reveal that two molecules of the ligand and the anion are coordinated to the metal atom in all the four complexes.