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Well Logging For Earth Scientists

The search for anticancer metal-based drugs alternative to platinum derivatives could not exclude zinc derivatives due to the importance of this metal for the correct functioning of the human body. Zinc, the second most abundant trace element in the human body, is one of the most important micro-elements essential for human physiology. Its ubiquity in thousands of proteins and enzymes is related to its chemical features, in particular its lack of redox activity and its ability to support different coordination geometries and to promote fast ligands exchange. Analogously to other trace elements, the impairment of its homeostasis can lead to various diseases and in some cases can be also related to cancer development. However, in addition to its physiological role, zinc can have beneficial therapeutic and preventive effects on infectious diseases and, compared to other metal-based drugs, Zn(II) complexes generally exert lower toxicity and offer few side effects. Zinc derivatives have been proposed as antitumor agents and, among the great number of zinc coordination complexes which have been described so far, this review focuses on the design, synthesis and biological studies of zinc complexes comprising N-donor ligands and that have been reported within the last five years.

https://www.mdpi.com/1420-3049/25/24/5814/pdf

Zinc Complexes with Nitrogen Donor Ligands as Anticancer Agents.

The reaction of copper(II) trimethylacetate, [Cu(Piv)2]n (Piv = C(Me)3COO–), with caffeine (L) (Cu : L = 1 : 1) in anhydrous acetonitrile yielded the binuclear complex [Cu2(Piv)4(L)2] ⋅ 2CH3CN (I). The structure of the complex in the crystal was established by X-ray diffraction (CIF file CCDC no. 2 006 753), and the electronic structure was studied by ESR. The effect of caffeine coordination to the biogenic complexing agent was established: the in vitro biological activity of the obtained complex towards the non-pathogenic strain Mycolicibacterium smegmatis was eight times higher than that of free caffeine.

Copper(II) Trimethylacetate Complex with Caffeine: Synthesis, Structure, and Biological Activity

A completely water soluble azobenzene chemosensor 1 for selective detection of Hg2+ was synthesized. Taking advantage of the absorption changes corresponding to the transition moments polarized along the short axis of an azobenzene, 1 showed characteristic UV-Vis signal changes in the band around 240 nm for Hg2+ in wide pH ranges, which also showed good tolerance to various metal ions and photoirradiation. Upon addition of Hg2+ into the solution of 1, a favored formation of trans-1 was observed, which is attributed to an intramolecular coordination of the PEG chain and Nβ to Hg2+ confirmed by a control experiment test.

Selective mercury(ii) detection in aqueous solutions upon the absorption changes corresponding to the transition moments polarized along the short axis of an azobenzene chemosensor

In latterly years, an interest in the synthesis of crown ether Schiff bases and their Complexes has been increased, due to the significance and broadly the uses of these compounds in various fields. In the present review paper outline extensive recent advances literature survey on the crown ether including azomethine gathering and their complexes with the tough and easy granter atoms, has been reconsidered. Assertiveness has been done on element complexation with crown ether holding Schiff bases to enable the researchers to procure valuable information of the chelating activity of crown ether containing azomethine gathering and their enforcement.

/pdf/crown-ether-schiff-bases-and-their-complexes-recent-advances-i9w6mfo0s9.pdf

Crown Ether Schiff bases and Their Complexes: Recent Advances Review

• New scintillation glass in Gd 2 O 3 -Al 2 O 3 -SiO 2 system, Ce 3+ -doped, was made. • Plurality of Ce 3+ surroundings was proposed from photoluminescence measurements. • Increase of Ce 3+ content shorten scintillation kinetics and keeps high light yield. • Scintillation average decay time of 60 ns and yield of ∼2000 phot./MeV were achieved. Heavy scintillation glass of Gd 2 O 3 -Al 2 O 3 -SiO 2 composition doped with Ce, combining high light yield and fast scintillation kinetics, was developed. The glass samples were prepared at 1500 °C by a melt-quench technique; the resulting glass was colorless and satisfactorily homogeneous. A photoluminescence study showed that a variety of sites for the Ce 3+ ion stabilization exists in the glass, but the phenomenon was found less pronounced compared to BaO-Gd 2 O 3 -SiO 2 glass. The glass has demonstrated ∼4 times faster scintillation kinetics and a minor drop of the light yield related to barium-gadolinium-silica glass, which makes this material of particular interest for large volume detectors in high energy physics, medical imaging, and other applications due to a low-cost production capability. 

(Gd,Ce)2O3-Al2O3-SiO2 scintillation glass

Amidation of diphenylphosphorylacetic acid gave tridentate ligands Ph2P(O)CH2CON(R)· CH2CH2P(O)Ph2 (R = Me, Bu, Oct) containing a phosphoryl group in the amide moiety According to the 1H, 13C{1H}, and 31P{1H} NMR spectra, the synthesized compounds exist in CDCl3 solution as two conformers at the ratios of ~25 : 1 (R = Me), 26 : 1 (R = Bu), and 30:1 (R = Oct) These ratios do not change with temperature (heating or cooling)

New Tridentate Carbamoylmethylphosphine Oxides: Synthesis and NMR Spectra

This study provides a comparative characterization of the structural parameters and cytotoxicity of zinc halide and copper(II) bromide complexes with caffeine (caf) of the composition [Zn(caf)(H2O)X2] (X = Cl, Br, I) and [Cu(caf)2Br2] (1). The cytotoxicity of the complexes is dose-dependent in all cell lines. The concentrations of the complexes, at which they are more cytotoxic against cancer cells (MCF-7) than against stem cells (DPSC), were determined. The synthesized complexes exhibited synergism of cytotoxicity.

Zinc(II) halide and copper(II) bromide complexes with caffeine: structures, physicochemical properties, and biological activity

Synthesis, structure and cytotoxicity of a zinc(II) bromide complex with caffeine

A number of new stable azomethine crown ether derivatives have been synthesized by condensation of 4-aminobenzo-15-crown-5 with aromatic aldehydes. Complexation of the products with transition metal cations (Cu2+, Zn2+, Fe3+, Co3+, Ni3+) has been studied by spectrophotometry.

S. K. Belus

Papers

(Gd,Ce)2O3-Al2O3-SiO2 scintillation glass

New Tridentate Carbamoylmethylphosphine Oxides: Synthesis and NMR Spectra

Zinc(II) halide and copper(II) bromide complexes with caffeine: structures, physicochemical properties, and biological activity

Synthesis, structure and cytotoxicity of a zinc(II) bromide complex with caffeine

Synthesis and properties of macroheterocyclic azomethines based on 4-aminobenzo-15-crown-5