A Possibility of Improving Lead Dioxide Electrode of Lead Battery

The influence exerted by a reinforcing additive, an aqueous suspension of 4D fluoroplastic (Teflon), on the structural, physicochemical, and service characteristics of the positive electrode of the lead battery was studied. A paste with polymer and carbon additives, extending the service life of the lead dioxide electrode, was developed for industrial use.     

Bound States in the Continuum in Magnetophotonic Metasurfaces

JETP Letters - We analyze the enhancement mechanisms of magneto-optical effects in all-dielectric metasurfaces caused by the bound state in the continuum resonance. In a structure under study, a...     

Synthesis of 3,5-di-tert-butyl-4-hydroxyphenylsulfanylmethyl-substituted tetramethylcalix[4]resorcinarenes

Russian Journal of Organic Chemistry -     

Chiral guest in a chiral framework: X-ray diffraction study

The inclusion compound of zinc lactate terephthalate with R-butan-2-ol, [Zn₂(R-Bu^sOH) (bdc)(S-lac)]?(R-Bu^sOH) (Bu^sOH is butan-2-ol, H₂bdc is terephthalic acid, S-H₂lac is lactic acid), was prepared by soaking crystals of [Zn₂(dmf)(bdc)(S-lac)]?DMF in pure R-butan-2-ol. The positions of chiral alcohol molecules in voids of the chiral framework and the host–guest contacts were determined by X-ray diffraction. These data provide an explanation for the origin of chiral discrimination of zinc lactate terephthalate toward the R-isomer of butan-2-ol.     

Behaviour of transplutonium and rare earth elements on TVEX

Behaviour of transplutonium and rare-earth elements on TVEX, containing TBP, HDEHP, mixture of TBPHDEHP (11), PAPNA and TOA has been studied. The analytical possibility of isolation and separation of tetravalent Pu and Bk from trivalent actinides and lanthanides from strong nitric acid solutions (1.0–12.0) on TVEX with TBP, POR, HDEHP and TOA has been demonstrated. The separation of trivalent Bk, Cf and Eu from Am and Cm is real on TVEX, containing HDEHP and mixture of TBPHDEHP.     

Synthesis of acylhydrazones of sterically hindered hydroxybenzaldehydes based on phloroglucinol

New acylhydrazones containing sterically hindered phenolic fragments with different degrees of steric shielding were synthesized by reactions of 2,2′,2″-[benzene-1,3,5-triyltris(oxy)]triacetic acid trishydrazide with hydroxybenzaldehydes. According to the NMR data, the products in solution exist as relatively stable conformational cis/trans isomers with respect to the C(O)-NH bond.     

Synthesis,structure and antioxidant activity of sulfur-containing tetrakisphenol

3-[2-(3,5-Di-tert-butyl-4-hydroxyphenylsulfanyl)acetoxy]2,2-bis[2-(3,5-di-tert-butyl-4-hydroxyphenylsulfanyl) acetoxymethyl]propyl 3,5-di-tert-butyl-4-hydroxyphenylsulfanylacetate was synthesized. Its structure was determined by means of ¹H and ¹³C NMR spectroscopy and X-ray-diffraction analysis. This compound was found to possess high antioxidant activity in the conditions of auto-oxidation of low-pressure polyethylene.     

Coordination polymers with adjustable dimensionality based on CuII and bis-imidazolyl bridging ligand

1,4-Bis(imidazol-1-yl)butane was synthesized from imidazole and 1,4-dibromobutane in an alkaline medium. A variation of the molar ratio of reagents in the system copper(II) chloride dihydrate and 1,4-bis(imidazol-1-yl)butane (bImB) upon heating in N,N-dimethylformamide resulted in the synthesis of two new coordination polymers [Cu(bImB)Cl₂] (1) and [Cu(bImB)₂Cl₂] (2), which were structurally characterized. Product 1 was found to possess a chain structure, while structure 2 is built of neutral layers, with the dimensionality of the extended coordination structures being determined by the reaction conditions. The new compounds were characterized by IR spectroscopy, elemental analysis, and powder X-ray diffraction data.

     

CRYSTAL STRUCTURE OF DENSE METAL-ORGANIC FRAMEWORKS BASED ON Sc(III) AND TWO TYPES OF LIGANDS

Journal of Structural Chemistry - Interaction of scandium(III) salts with 2,2′-bipyridine-4,4′-dicarboxylic and terephthalic acids under solvothermal conditions yields two novel...