Magnetically active products of the interaction between the modified multi-walled carbon nanotubes, MWCNT-CO-L (L = 3-(NHCH 3 )C 5 H 4 N), and compounds containing Fe III ions, FeCl 3 ·6H 2 O (including those with 57 Fe isotopes) and trinuclear pivalate Fe 2 NiO(Piv) 6 (HPiv) 3 (HPiv = HO 2 CCMe 3 ), were obtained. The new substances were characterized by thermo-gravimetry combined with mass spectral analysis, Mössbauer spectroscopy, atomic absorption spectrophotometry, electron microscopy, and magnetic measurements. Based on the data of Mössbauer spectroscopy and magnetic studies, it was suggested that in the synthesized {Fe}-MWCNT-CO-L the surface of the carbon nanotubes contains nanoparticles of the polynuclear iron(III) derivatives.

Modified multi-walled carbon nanotubes (MWNT)-CO-L (L = NHCH 2 C 5 H 4 N) were synthesized. The possibility of their interaction with magnetically active binuclear complex Cu 2 (Piv) 4 (HPiv) 2 was shown. The presence of copper( ii ) ions on the surface of the reaction product, {Cu}@MWNT-CO-L, was suggested and confirmed by the data of thermogravimetry combined with mass spectral analysis, ESR spectroscopy, atomic absorption spectrophotometry, and electron microscopy (TEM and SEM).

A new method for the synthesis of oxonium derivatives of the closo-decaborate anion in high yields was described. Reactions of the anion B10H10 2− with cyclic ethers (tetrahydrofuran (THF) and tetrahydropyran) in the presence of dry HCl are stepwise processes. Depending on the reaction temperature and time, either mono- or disubstituted products were obtained. Their structures were determined using 11B, 13C, and 1H NMR and IR spectroscopy, ESI mass spectrometry, and elemental analysis for boron.

Nucleophilic substitution at the exo-polyhedral boron atoms of claso-decaborate [B10H10]2- in the presence of carbocations, which were generated in situ from various halocarbons (triphe-nylmethyl chloride, 1-bromoadamantan, n-butyl bromide), was studied. The reactions carried out in nucleophilic solvents (cyclic ethers and thioethers, N,N-disubstituted amides, and car-boxylic acids) and in the presence of halocarbons afforded mono-and disubstituted compounds with the exo-polyhedral B—O and B—S bonds, which contained a molecule of the solvent as substituent. The structures of the compounds synthesized were confirmed by the IR, mass, and 1H, 11B, and 13C NMR spectra.

In vitro studies of the interaction of DNA with morfozol (a palladium (II) acid complex) demonstrated active binding with DNA, detected in terms of reductions in accessibility to actinomycin D. Extensive and stable inhibition of DNA synthesis was seen in L1210 and P388 leukemia cells; this was less marked in Akatol and B16 melanoma cells. Studies of the intracellular distribution of palladium in Akatol and P388 tumors after administration of Morfozol to tumor-bearing mice showed predominant accumulation in the cytosol fraction, which is evidence of an active interaction of the agent with cell proteins. I.p. administration of morfozol led to quite high palladium concentrations in the nuclear fraction. As morfozol is characterized by high reactivity, there are probably other targets, such as DNA polymerase and regulatory protein factors.

Single crystals of the solid solutions CdGeAs2:Mn(x) and Cd0.964Zn0.036GeAs2:Mn(x) have been grown by the vertical Bridgman method. An X-ray diffraction study has demonstrated that Cd0.964Zn0.036GeAs2 (I), Cd0.964Zn0.036GeAs2:Mn (1.5 wt%) (II), and Cd0.964Zn0.036GeAs2:Mn (2.18 wt %) (III) retain the CdGeAs2 structure (tetragonal system, space group I \(\bar 4\)2d). The unit cell parameters of the solid solutions are as follows: a = b = 5.934(1) Å, c = 11.219(2) Å for I; a = b = 5.919(1) Å, c = 11.204(2) Å for II; and a = b = 5.918(1) Å, c = 11.208(2) Å for III. Many of Mn atoms in II and III occupy interstitial sites in the crystal lattice. Selected electrical and magnetic properties of single crystals of CdGeAs2:Mn(x) are discussed.

The phase relations in the HgCr2Se4-CdCl2 system have been investigated using differential thermal analysis and x-ray diffraction, and the primary crystallization field of the spinel phase in this system has been located: 560–750°C, 84–97 mol % CdCl2. By optimizing growth conditions and using CdCl2 as a flux, single crystals of Hg1−x CdxCr2Se4 solid solutions containing up to 5 wt % Cd have been grown.

Large, perfect CdGeAs2 single crystals doped with 0.006, 0.49, and 0.89 wt % Mn are grown by the Bridgman method. The Mn concentration in the crystals is determined by atomic absorption spectrophotometry. X-ray diffraction results indicate that Mn doping influences the bond distances in CdGeAs2 and its lattice parameters. Based on the observed structural changes, a model is proposed for the Mn incorporation into the structure of CdGeAs2.

The compounds MB10H11 (M = Me4N+, Et4N+, Bu4N+, Ph4P+, Ph4As+) are synthesized. A procedure is proposed for boron determination by atomic absorption spectrophotometry, using microwave processing for sample preparation.

Property–composition relationships in multicomponent superconductors containing rare earths, vanadium, and tungsten are examined. A method is proposed for determining these elements with high accuracy and reproducibility.

The compositions of two new phases (cubic and tetragonal) in the Y 2 O 3 –BaO–WO 3 –CuO system were determined. The dissolution behavior of these phases was found to correlate with their composition.

Te-doped ZnAs 2 crystals were prepared by vertical Bridgman growth. The effective distribution coefficient of Te in a ZnAs 2 crystal with a nominal Te content of 3.7 × 10 -4 wt % Te grown at a solidification rate of 0.5 mm/h was determined to be 0.9. Te was shown to act as a donor impurity in ZnAs 2 .

An approach to the determination of platinum-group metals in carbonaceous rocks is proposed with due regard to the wide diversity of compounds formed by platinum-group metals in these rocks. A necessary condition for the correct determination of platinum-group metals is the complete decomposition of the carbonaceous matter of a rock. At the initial stage of the analysis, the decomposition of a sample and the elimination of carbon are achieved by annealing the samples in an oxygen atmosphere at 60-700 degrees C.