Binuclear Coordination Assemblies of Metal Tetraphenylporphyrins (M = Mn, Fe, and In) with Anionic Thioindigo Bridges as Promising Magnetic Systems with Tunable Properties.

A series of hybrids comprising two metal (Mn, Fe, and In) tetraphenylporphyrins axially substituted with anionic bidentate -thioindigo ligands (TI) were obtained. Substitution of the axial chloride anion by an oxygen atom of the dye forms short M-O bonds. Crystalline binuclear assemblies (TI)·{[MnTPP]·[MnTPP]}·CHCl ( = 2 for or 1 for ) and (TI){[MTPP]}·CHCl (M = Fe and = 2 for , M = In and = 1 for ) were synthesized.

The Reaction of Fenchone and Camphor Hydrazones with 5-Acyl-4-Pyrones as a Method for the Synthesis of New Polycarbonyl Conjugates: Tautomeric Equilibrium and Antiviral Activity.

Selective synthesis of polycarbonyl conjugates of (+)-fenchone and (+)-camphor was carried out (44-91 % yields) via the ring-opening transformation of 5-acyl-4-pyrones with hydrazones of the corresponding monoterpenoids. A strong influence of the hydrazone fragment on the observed tautomeric equilibrium of the tricarbonyl system was shown. Although the major tautomer of the conjugates is the acyclic polycarbonyl form, the camphor-based conjugates undergo new type of ring-chain tautomerism, diketoenaminone-dihydropyridone equilibrium, and predominantly exist in the cyclic dihydropyridone form in DMSO-d.

Natural radionuclide profiles and radiological risks in soils and rocks of the Koytash-Ugam Range, Uzbekistan.

This investigation quantifies the activity concentrations of natural radionuclides (Ra, Th, and K) in the soils and certain rocks of the Koytash-Ugam Range, Uzbekistan, and assesses their radiological risks. Gamma-spectrometric analysis of soil and rock samples revealed activity concentrations ranging from 456.2 ± 56.

Synthesis of Substituted 1,2,4-Triazole-3-Thione Nucleosides Using Purine Nucleoside Phosphorylase.

1,2,4-Triazole derivatives have a wide range of biological activities. The most well-known drug that contains 1,2,4-triazole as part of its structure is the nucleoside analogue ribavirin, an antiviral drug. Finding new nucleosides based on 1,2,4-triazole is a topical task.

Efficient synthesis and evaluation of therapeutic potential of fluorine containing 2-arylchromen-4-ones.

A large series of 2-arylchromen-4-ones containing from 1 to 3 fluorine atoms or a trifluoromethyl group in the structure was synthesized by condensation of fluorinated 2-hydroxyacetophenones with benzaldehydes in an alkaline medium and subsequent oxidative cyclization of the resulting 2'-hydroxychalcones by action of I in DMSO. The cytotoxicity of the obtained compounds was studied in glioblastoma cell line, SNB19, and in a monkey-derived normal kidney epithelium cell line, Vero. In addition, antiglycation activity of the obtained compounds was evaluated.

Study on induced radioactivity and individual dose evaluation in Gantry room for Varian ProBeam Proton Therapy System.

Proton therapy has emerged as an advantageous modality for tumor radiotherapy due to its favorable physical and biological properties. However, this therapy generates induced radioactivity through nuclear reactions between the primary beam, secondary particles, and surrounding materials. This study focuses on systematically investigating the induced radioactivity in the gantry room during pencil beam scanning, utilizing both experimental measurements and Monte Carlo simulations.

Evaluation of soil radioactivity in the areas of underground nuclear explosions at the Pomuk gas field site in Uzbekistan.

This study investigates soil radioactivity at the Pomuk gas field in Uzbekistan, a region with history of underground nuclear activity. Using a NaI (Tl) scintillation gamma spectrometer, soil samples were analyzed for concentrations of Th, Ra, K, and Cs. Concentrations were found to be in the range of 19.

Paramagnetic {[Fe(CO)]-μ-η:η-η:η-(C)} Dimer Bridged by Iron Atoms and C-C Bonds: Effect of Starting Iron Carbonyls on Structures and Properties of Negatively Charged Iron-Bridged Fullerene Dimers.

The reaction between an excess of Fe(CO) with {Cryptand(K)}(C) produced the salt {Cryptand(K)}{[Fe(CO)]-μ-η:η-η:η-(C)}·4CHCl () containing negatively charged iron-bridged fullerene dimers. In these dimers, the C cages are linked via two Fe(CO) fragments, forming short Fe-C(C) bonds with a length of 2.070(3) Å and via two intercage C-C bonds with a length of 1.

Bimetallic neutral and anionic complexes of transition metal (Co, Mn) carbonyls with indium(III) phthalocyanine.

Heterobimetallic {[Co(CO)][In(Pc)]} (1) and (Cp*Cr){[Mn(CO)][In(Pc˙)]}·2CHCl (2) complexes based on indium(III) phthalocyanine (Pc) were obtained as crystals. The complexes were synthesized by single (1) and double (2) reduction of indium(III) phthalocyanine chloride in the presence of transition metal carbonyls. Complex 1 contains dianionic Pc macrocycles.

Magnetic behavior and ground spin states for coordination {L·[M(Hal)]} assemblies (Hal = Cl or I) of radical trianion hexacyanohexaazatriphenylenes (L) with three coordinated high-spin Fe ( = 2) or Co ( = 3/2) centers.

A series of trianion assemblies of hexaazatriphenylenehexacarbonitrile {HAT(CN)} and hexaazatrinaphthylenehexacarbonitrile {HATNA(CN)} with three Fe(II) or Co(II) ions: {cryptand(K)}·{HATNA(CN)·(FeI)}·2CHCl (1), {cryptand(K)}·{HATNA(CN)·(CoI)}·2CHCl (2), and (CV)·{HAT(CN)·(CoCl)}·0.5(CVCl)·2.5CHCl (3) are synthesized (CVCl = crystal violet).

Evaluation of radon hazards at the rural settlements of Uzbekistan.

The "passive" sorption detectors based on the activated charcoal together with scintillation spectrometry were utilized to measure radon flux density from the soil surface as well as volumetric activity of indoor radon at the dwellings of rural areas of Uzbekistan. Additionally, gamma dose rates as well as concentrations of natural radionuclides in soil and building materials samples were determined. Based on the values of natural radionuclides, common radiological indices have been calculated.

Synchrotron single-crystal XRD, IR-, Raman spectroscopy and high pressure study of synthetic krieselite.

Spontaneous crystals of krieselite (Ge analogue of topaz) with the chemical formula Al[(GeSi)O](FOH) were synthesized using a thermo-gradient hydrothermal method at a temperature of 600/650 °C and pressure of 100 MPa. The unit cell parameters are: a = 8.9732(8) Å, b = 8.

Negatively Charged Iron-Bridged Fullerene Dimer {Fe(CO)-μ-η,η-C}.

The interaction of {Cryptand(K)}(C) with Fe(CO) produced {Cryptand(K)}{Fe(CO)--,-C}·2.5CHCl () as the first negatively charged iron-bridged fullerene C dimer. The bridged iron atoms are coordinated to two 6-6 bonds of one C hexagon with short and long C(C)-Fe bonds with average lengths of 2.

Crystalline paramagnetic supramolecular 2D-polymer of the tetra(4-pyridyl)porphyrin and terbium(III) complex.

A new promising method for the preparation of crystalline 2D polymers based on tetra(4-pyridyl)porphyrin has been developed. Radical anion {HT(4-Py)P˙} species are used as the starting material. A new solid-state supramolecular array [{HT(4-Py)P}·{Tb(TMHD)}]·2.

A short overview of radioactivity measurement studies in Uzbekistan.

Natural radioactivity is a public health issue that affects people all around the world. Environmental radioactivity accounts for approximately 87% of the radiation dose received by human beings. The primary external source of irradiation to the human body is gamma radiation emitted by naturally occurring radioisotopes such as K and radionuclides from the Th and U families, as well as their decay products, which exist at trace amounts in all ground formations.

Trinuclear coordination assemblies of low-spin dicyano manganese(II) ( = 1/2) and iron(II) ( = 0) phthalocyanines with manganese(II) acetylacetonate, tris(cyclopentadienyl)gadolinium(III) and neodymium(III).

The reaction of MnPc, FePc or FePcCl with KCN in the presence of cryptand[2.2.2] yielded dicyano-complexes {cryptand(K)}{M(CN)(macrocycle)}·CHCl (M = Mn and Fe, = 1 and 2) that were used for the preparation of trinuclear assemblies of the general formula {cryptand(K)}{M(CN)Pc·(ML)}·CHCl (M = Mn and Fe; = 1, 4 and 5).

Complexes of transition metal carbonyl clusters with tin(II) phthalocyanine in neutral and radical anion states: methods of synthesis, structures and properties.

Coordination of tin(II) phthalocyanine to transition metal carbonyl clusters in neutral {Sn(Pc)} or radical anion {Sn(Pc˙)} states is reported. Direct interaction of Co(CO) with {Sn(Pc)} yields a crystalline complex {Co(CO)·Sn(Pc)} (1). There is no charge transfer from the cluster to phthalocyanine in 1, which preserves the diamagnetic Pc macrocycle.

Weak Antiferromagnetic Exchange and Ferromagnetic Alignment of Fe (S=2) Spins in Differently Charged {HAT ⋅ (Fe Cl ) } (n=2- and 3-) Assemblies of Hexaazatriphenylenes (HAT).

Hexaazatrianthracene (HATA) and hexaazatriphenylenehexacarbonitrile {HAT(CN) } are reduced by metallic iron in the presence of crystal violet (CV )(Cl ). Anionic ligands are produced, which simultaneously coordinate three Fe Cl to form (CV ) {HATA ⋅ (Fe Cl ) }  ⋅ 3 C H Cl (1) and (CV ) {HAT(CN) (Fe Cl ) }  ⋅ 0.5CVCl ⋅ 2.

Synthetic brunogeierite FeGeO: XRD, Mössbauer and Raman high-pressure study.

We present complex spectroscopic data of the synthetic brunogeierite (Fe)GeO with space group Fd3¯m of spinel structure: a = 8.3783 (6) Å, V = 588.12 (13) Å.

Macrocycle- and metal-centered reduction of metal tetraphenylporphyrins where the metal is copper(II), nickel(II) and iron(II).

The reduction of metal(II) tetraphenylporphyrins, where metal(II) is copper, nickel or iron, has been performed in toluene solution in the presence of a cryptand. Cesium anthracenide was used as a reductant. Crystalline salts {cryptand(Cs)}{Cu(TPP)} (1) and {cryptand(Cs)}{Ni(TPP)}·CHCH (2) have been obtained.

Dianionic States of Trithiadodecaazahexaphyrin Complexes with Homotrinuclear MO Clusters (M = Ni and Cu): Crystal Structures, Metal- Or Macrocycle-Centered Reduction, and Doublet-Quartet Transitions in the Dianions.

Metal complexes of trithiadodecaazahexaphyrin (Hhp) that contain MO clusters inside a π-extended trianionic (Hhp) macrocycle have been prepared. Studies of the magnetic properties of NiO(Hhp) and CuO(Hhp) reveal a diamagnetic and EPR-silent trianionic (Hhp) macrocycle and diamagnetic Ni(O) or paramagnetic Cu(O) tetracations. The positive charge of MO(Hhp) is compensated by one acetate anion {MO(Hhp)}(CHCO).

Agricultural impacts drive longitudinal variations of riverine water quality of the Aral Sea basin (Amu Darya and Syr Darya Rivers), Central Asia.

River ecosystems are under increasing stress in the background of global change and ever-growing anthropogenic impacts in Central Asia. However, available water quality data in this region are insufficient for a reliable assessment of the current status, which come as no surprise that the limited knowledge of regulating processes for further prediction of solute variations hinders the development of sustainable management strategies. Here, we analyzed a dataset of various water quality variables from two sampling campaigns in 2019 in the catchments of two major rivers in Central Asia-the Amu Darya and Syr Darya Rivers.