Influence of the nature of organic components in dinuclear copper(II) pivalates on the composition of thermal decomposition products

Tetrabridged dinuclear complexes ((2-NH₂)C₅H₄N)₂Cu₂(μ₂-OOCCMe₃)₄ (2·С₆Н₆) and ((3-NH₂)C₅H₄N)₂Cu₂(μ₂-OOCCMe₃)₄ (3) and the cocrystallization product ((4-NMe₂)C₅H₄N)₂Cu(η²–OOCCMe₃)₂·2((4-NMe₂)C₅H₄N)₂Cu₂(μ₂-OOCCMe₃)₄ (4) were synthesized by the reaction of the polymer [Cu(OOCCMe₃)₂]_n (1) with aminopyridine ligands (L) of different nature (Cu: L = 1:1) in С₆Н₆. The solid-state thermal decomposition of these compounds was studied by differential scanning calorimetry and thermogravimetry, and their electrochemical behavior was investigated by cyclic voltammetry. All newly synthesized complexes were studied by X-ray diffraction, the magnetic properties of the complexes were investigated, and ESR measurements were performed.     

Pivalates with the M<Superscript>II</Superscript><Subscript>4</Subscript>O<Subscript>4</Subscript> cubane core (M = Co,Ni): synthesis,structure, magnetic properties,and solid-state thermolysis

Methods were developed for the controlled thermal synthesis of high-spin cubane-like pivalates {M^II ₄(μ₃−OR)₄} (M = Co or Ni; R = H or Me) starting from mono-and polynuclear complexes. The solid-state thermal decomposition of the known pivalate clusters [M^II ₄(μ₃−OMe)₄−(μ₂−OOCBu^t)₂(η²−OOCBu^t)₂(MeOH)₄] and the new clusters [M₄^II(μ₃)−OH₄(η¹−OOCBu^t)₃−(μ−(NH₂)₂C₆H₂Me₂)₃(η¹−(NH₂)₂C₆H₂Me₂)₃]⁺(OOCBu^t)− (M = Co or Ni) was studied by differential scanning calorimetry and thermogravimetry. The thermolysis of cubane-like CoII and NiII pivalates is a destructive process. The phase composition of the decomposition products is determined by the nature of coordinated ligands and the structural features of the metal core.     

Growth Morphology and Structure Peculiarities of Superthin Titanium Films

Superthin titanium films of 0.3 to 2 nm thickness, prepared by radio-frequency sputtering, have been studied by modern X-ray methods, such as reflectometry, fluorescent analysis and grasing-beam structural analysis. Two simple models were used to describe early stages of film growth. It has been shown that the thinnest titanium films were the TiO₂ islands with an equal height. Thicker films could be described as bilayers Ti/TiO₂. The films became continuous already near 1.5 nm effective thickness.     

Crystal Structure and Growth Morphology of Nickel Superthin Films

Ni superthin films of t = 0.3–3.5 nm thickness prepared by radio-frequency sputtering have been studied by mordern X-ray methods, such as reflectometry, fluorescence analysis and grazing-beam structure analysis. The results have shown that the films were polycrystalline and their densities correspond to bulk values for nickel already at the early stage of growth. None oxides were found in Ni films. The model of earliest stage film growing have been suggested: film begins to grow by the island mechanism, but the crystallization front remains perfectly plane during the growth.