[en] Complex [Ce(Piv)₃(HPiv)₃]₂ was prepared by precipitation of cerium(III) nitrate aqueous solution with salt NH₄(Piv) (HPiv = pivalic acid) and subsequent recrystallization from 5% HPiv solution in hexane. According to data of X-ray diffraction analysis and IR spectroscopy crystal structure of the complex is built of centrally symmetric dimers, in which cerium atoms are bound by four bridge pivalate ligands. Thermal analysis suggests that heating of the complex in nitrogen atmosphere results first in splitting off six HPiv molecules in the range of 90-190 deg C and then in thermolysis of Ce(Piv)₃ formed at 290-450 deg C. Sublimation of Ce(Piv)₃ occurs in the range of 290-350 deg C along with thermolysis during heating in vacuum (0.01 mm Hg), which permits preparing CeO₂ films by the method of chemical precipitation from gaseous phase

[en] La(Acac)₃Phen complex is synthetized, its X-tray structure analysis is carried out. Crystals are monoclinic ones, sp.gr. P2₁/n, a=17.11 (12), b=18.16 (3), c=17.86 (2) A, β=91.32 (2) deg, V=5548 (13) A³, Z=8. Structure contains two crystallographically non-equivalent types of molecules differing in interatomic distances and valent angles, as well as, in angles between ligand planes. Behaviour of La(Acac)₃Phen at heating in vacuum (0.1-0.01 mm Hg) is studied. It is shown that under those conditions processes of Phen splitting, of sublimation and polymerization of La(Acac)₃ lanthanum acetylacetonate formed following Phen splitting and that under 220 deg C during 30 min quantitative transition of La(Acac)₃Phen into gas phase is reached. 10 refs., 2 figs., 3 tabs

[en] Existence of previously disputed dihydrate of ytterbium tris-acetylacetonate YbAs-2H₂O is proved by the methods of preparative chemistry, chemical, X-ray diffraction, X-ray phase and thermal analyses. The structure YbA₃central dot2H₂O contains monomer molecules unified in layers by hydrogen bonds. Coordination polyhedron of Yb atom is a slightly distorted square antiprism. Yb-O distances in dihydrate are much longer than in YbA₃central dotH₂O monohydrate. The absence of a correlation in bond lengths Yb-O, O-C and C-C in chelate cycles is pointed out, which proves mainly ionic type of metal-ligand bond in the given compounds. A scheme of muturl transitions of ytterbium tris-acetylacetonate hydrated is suggested, their thermodynamic stability being discussed. 9 refs., 3 figs., 3 tabs

[en] Synthesis and X-ray diffraction analysis of praseodymium tris-pivalate adduct with α,α'-dipyridyl of PrPiv₃Dipy composition were conducted. Coordination number of praseodymium atom equals 9 in central-symmetrical dimeric molecule. Praseodymium atoms are connected by two bidentate-bridge and two tridentate-bridge-cyclic carboxylic groups. Molecules of α.α'-Dipy form five-membered chelate cycles. 5 refs., 1 scheme, 1 tab

[en] The paper deals with the synthesis and X-ray diffraction investigation of praseodymium nitrate dipivalate adduct with o-phenanthroline of PrPiv₂(NO₃)Phen₂ composition. The crystals are triclinic: a = 9.738(4), b = 11.860(5), c = 15.451(6) A, α = 91.80(2), β = 99.41(2), γ = 103.69(2) deg, sp. gr. P1, d_cald = 1.490 g/cm³. The coordination number of praseodymium atom in a monomeric molecule equals 10, both carboxylate groups and nitrate ion are coordinated by the bidentate-cyclic method. Phenanthroline molecules are formed by five-membered chelate cycles in the process of coordination. 5 refs., 1 fig., 2 tab

[en] Solid mixed-ligand complexes (MLC) formed as a result of pivalic acid (HPiv) action on dipivaloylmethanates of holmium, erbium and ytterbium (MDpm₃) in hexane, have been isolated. By the methods of IR spectroscopy and element analysis it has been ascertained that MLC of erbium and ytterbium have the composition MDpm₃xHPiv, and in case of holmium a mixture of the complexes is formed. For HoDpm₃xHPiv X-ray diffraction analysis has been carried out and its crystal structure has been refined. 7 refs.; 1 fig.; 4 tabs

[en] Solid mixed-ligand complexes (MLC) formed under the action of pivalic acid (HPiv) on dipivaloylmethanates of Nd, Eu, Gd, Dy, Tb (MDpm₃) in hexane have been isolated. On the basis of data of IR spectroscopic analysis it is ascertained that derivatives of neodymium, europium and gadolinium have the following composition MDpm₂Piv · xHDpm (0 < x < 0.5), and in case of Dy and Tb a mixture of complexes of the composition MDpm₃xHPiv and MDpm₂PivxHDpm is formed X-ray diffraction analysis of [GdDpm₂PivxH₂O] and [Nd₈Dpm₈Piv₆x(OH)₆(CO₃)(H₂O)]x4H₂O monocrystals prepared in the course of initial MLC recrystallization, has been performed. 3 refs.; 2 figs.; 5 tabs

[en] The structure of Ba(ReO₄)₂·4H₂O crystals of monoclinic modification (a=7.371, b=12.572, c=12.156 A, β=90.09 deg, Z=4, sp.gr. P2₁/n) prepared at room temperature from aqueous solution was studied by the method of X-ray diffraction analysis

[en] LaCl₃x3ROH(1) compounds is prepared at interaction of metallic lanthanum or ''La(i-PrO₃'' with HCl solution in ROH(Ri-Pr) dehydrated alcohol. Non-controlled hydration results in formation of LaCl₃x2ROHxH₂O (2) compound. Presence of [La₂(ROH)₆Cl₄(μ-Cl)₂ dymer molecules where CN equals to 7, is determined in 1 compound structure using X-ray structure analysis. [La(ROH)₂(H₂O)Cl(μ-Cl)₂]_n more stable polymer structure of 2 compound with LaCN equal to 8 results from slight substitution of water molecule for ROH one molecule. Structures of 1 and 2 compounds are compared with LaCl₃x7H₂O structure. 18 refs., 2 figs., 5 tabs

[en] Anodic oxidation of Ta in isopropyl alcohol or prolonged reflux of the solution of Ta(OPrⁱ)₅ in isopropyl alcohol yield binulear crystalline oxoisopropoxide Ta₂O(OPrⁱ)₈·PrⁱOH (1). Its molecule providing the first example of oxoisopropoxide with only two metal atoms involves tantalum coordination octahedra fused alone a common edge. Complex 1 is stable in solution; on transition to the gas phase it is desolvated, thus forming rather stable Ta₂O(OPrⁱ)₈ species. Analogous molecules according to the mass spectral data exist in vapour phase over Ta(OAlk)₅ (Alk = Me, Et, Prⁱ and Buⁿ). On heating of 1 in vacuo Ta(OPrⁱ) is sublimated. Heptanuclear complex Ta₇O₉(OPrⁱ)₁₇ (2) is precipitated from the solution of 1 in isopropyl alcohol after prolonged storage. Its metal core is built of two tetrahedra [Ta₄] sharing a common vertex. 20 refs., 3 figs., 6 tabs