APPLICATION OF STATIC AND DYNAMIC THERMOANALYTICAL METHODS TO ESTIMATE THE LIFETIME OF ELECTRICAL INSULATIONS

Different electrical insulations have been investigated by dynamic and static thermoana- lytical methods. The kinetic parameters were evaluated with the aid of a fast calculation method. The results were discussed on the basis of the thermal stability and the lifetime curves thus obtained

ON THE DIOXIMINE COMPLEXES OF TRANSITION METALS. LXXXVII. SPECTROPHOTOMETRIC STUDIES ON THE FORMATION OF SOME RHENIUM COMPLEXES WITH α-SUBSTITUTED ALICYCLIC OXIME DERIVATIVES

The formation conditions, stability in acidic aqueous solutions (Re(IV) : oxime = 1 : 4) and the analytical application of some rhenium complexes with 1,2-cyclohexane dione dioxime and 1,2-cyclododecanedione dioxime and 1,2,3- cyclohexane trione dioxime (1,3) deriva- tives: -2-hydrazone, -2-semicarbazone, 2-thiosemicarbazone and -2-phenylhydrazone were studied. The spectrophotometric measurements were carried out in hydrochloric acid medium in the presence of tin(II) chloride as reducing agent

ON THE DIOXIMINE COMPLEXES OF TRANSITION METALS, Part XC NEW AZIDO-COMPLEX ACIDS OF COBALT(III) WITH ALICYCLIC α-DIOXIMES

Four new diazido-complex acids of the type H[Co(Diox.H)2(N3)2] (Diox.H2 = alicyclic α-dioximes: Cpdox.H2, Niox.H2, Heptox.H2 and Octox.H2) and the H[Co(Niox.H)2(N3)(NO2)] were obtained by air oxidation of the components and by sub- stitution reactions. The free acids and their salts were characterized by IR and electronic spectra and by potentiometric measurements. The composition of the azido-derivatives was proved also by isolation of 30 new salts with cobalt(III)- and chromium(III)- amine bases

ON THE DIOXIMINE COMPLEXES OF TRANSITION METALS. XCV. NEW IODO-AMINO-BIS-DIMETHYLGLYOXIMATO-COBALT(III)-NONELECTROLYTES

New nonelectrolytic type chelate compounds of cobalt(III) with the general formula [Co(DH)₂IA)] DH-monodeprotonated dimethylglyoxime, A -different aromatic and heterocyclic amines and tertiary phosphines) were obtained by means of a substitution reaction from the diiodo-bis-dimethylglyoximato-cobaltiat and the corresponding amines and phosphines in alcoholic-aqueous media. The nonelectrolytes are sparingly soluble in water and soluble in some organic solvents, e.g. CHCl₃, DMFA, DMSO, etc. These derivatives were characterized by lR and electronic spectra, and in several cases by derivatographic measurements

THERMOANALYTICAL RESEARCH CARRIED OUT AT THE INSTITUTE OF INORGANIC CHEMISTRY OF TECHNICAL UNIVERSITY OF BUDAPEST

Thermoanalytical studies have been going on at the Institute of Inorganic Chemistry for nearly 20 years. The present paper wishes to introduce the results of three main fields of the investigations. Primarily, the goal of our studies was the production of complexes of transient metals with ligands containing different N-atoms and also the study of the obtained compounds with other analytical methods. On the other hand the thermal stability of inorganic polymers (especially the silicone-rubber and polyethylene) was examined, ageing estimations were done, and their dependence on the method of their production and on the pre-treatment processes modelling their possible application circumstances were investigated. Finally, the application of thermal investigations to solve various industrial problems was introduced, particularly in the territory of quality-tests of materials

ON THE DIOXIMINE COMPLEXES OF TRANSITION METALS. PART XCVII. a-SUBSTITUTED OXIME DERIVATIVES IN THE SPECTROPHOTOMETRIC DETERMINATION OF COBALTl

The formation conditions, composition, stability and analytical application of some ternary complexes: Co(II):11:X=1:2:2(11=aJiphatic and alycyclic a-dioximes; X=N;-, 1-), binary derivatives: Co(II):12 =a-ketoximes: diacetylmonoxime, methyl-isopropyl dione monoxime, 1,2,3-cyclohexane trione dioxime (1,3)), Co(II): 1 3=1:2 (13 =condensation products of ketoximes with semicarbazide, thiosemicarbazide) and Co(II):14=Schiff's bases with ethylenediamine and hydrazine) were studied spectrophotometrically. The electronic spectra of these complexes were recorded and discussed

ON THE OXIMINE COMPLEXES OF TRANSITION METALS. PART CXVIII. STUDY ON THE PROTOLYTIC EQUILIBRIA IN THE SOLUTIONS OF MIXED CHELATES OF THE TYPE [Co(Diox.H)2AB]n WITH ALICYCLIC α-DIOXIMES1

16 new chelate compounds of the type [Co(Diox.H)2AB]n (Diox.H2-alicyclic α-dioxime with C5..C8 in the hydroaromatic ring, A, B monodentate ligands: NCO-, NO2-, S2O32-, NH3, pyridine, aromatic amine) were obtained by air oxidation of the components and by various substitution reactions, respectively. The complexes were characterized by FTIR spectra. The complicated protolytic equilibria with the participation of the intramolecular O-H..O hydrogen bridges of the Co(Diox.H)2 moieties were studied by spectrophotometric and potentiometric measurements