New Metal Chelates with Sterically Hindered Azo Ligands: Synthesis and Physicochemical Properties

Metal chelates based on 3,5-di-(tert-butyl)-2-hydroxyazobenzene are synthesized and their physicochemical properties were studied. Four alternative structures and isomeric transformations between these structures were suggested on the basis of NMR data, electric dipole and magnetic moments, X-ray diffraction and quantum-chemical data. The change in stereochemistry of a complex through introduction of tert-butyl substituents was found to give unusual (for metal chelates with azo ligands (MN₂O₂)) dome-shaped isomers with the trans-planar coordination core at a vertex or with a distorted cis-structure.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 8, 2005, pp. 563–571.Original Russian Text Copyright © 2005 by Kogan, Lyubchenko, Shcherbakov, Ionov, Tkachev, Shilov, Aldoshin.     

1,1,4,4-Tetranitrobutane-2,3-diol and its derivatives. 4. Study of the reaction of 1,1,4,4-tetranitrobutane-2,3-diol with N-(methoxymethyl)-2-fluoro-2,2-dinitroethylamine; synthesis and crystalline structure of 1,12-difluoro-1,1,3,5,5,8,8,10,12,12-decanitro-3,10-diazadodecane-6,7-diol dinitrate

A two-step synthesis has been proposed to obtain 1,12-difluoro-1,1,3,5,5,8,8,10,12,12-decanitro-3,10-diazadodecane-6,7-diol dinitrate, starting from 1,1,4,4-tetranitrobutane-2,3-diol and N-(methoxymethyl)-2-fluoro-2,2-dinitroethyl-amine, followed by nitration of the Mannich base formed. An x-ray-diffraction investigation of the dinitrate obtained was carried out.Insitute of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 3, pp. 671–675, March, 1992.     

Luminescence of 4,7-diphenyl-1,10-phenanthroline forms bound in NAFION membrane

The fixation of 4,7-diphenyl-1,10-phenanthroline on walls of nanosized cavities of a Nafion perfluorosulfonic membrane was realized by two methods: by sorption of molecules on the sulfo groups of the membrane and by coordination attachment to previously grafted La³⁺ and Tb³⁺ cations. The bright luminescence of the molecule forms bound in the membrane is recorded at room temperature in the range of 400–500 nm.     

The influence of metals (Ag,Cu, Au) on the electrosurface properties of erythrocyte cells studied by electrorotation technique

The behavior of erythrocytes in electrolyte solutions (AgNO₃, CuCl₂, HAuCl₄) under the action of alternating rotating electric field within a frequency range from 10 to 500 kHz (the region of -dispersion) is studied. It is established that the dependences of the amplitude of angular velocity of erythrocyte electrorotation on the field frequency pass through the maximum. The cell rotational velocity is shown to be proportional to the square of field strength and its dependence on the concentration of ion metals is similar to the concentration dependence of cell electrophoretic mobility. The ability of erythrocytes to accumulate heavy metals in significant quantities leading to the inhibition of membrane enzymes is discovered. Sorption activity of cells with respect to studied metals decreases in a series: Au > Ag > Cu > Fe(III) > Ni. Experimental results are explained theoretically.Translated from Kolloidnyi Zhurnal, Vol. 67, No. 1, 2005, pp. 113–123.Original Russian Text Copyright © 2005 by Ulberg, Marochko, Savkin, Grusina, Shilov.