Preparation and Structure of Double Complex Compounds [La(HMPA)4(NO3)2][Cr(NH3)2(NCS)4]

Abstract

This paper presents the results of chemical analysis, IR-spectroscopic analysis, thermal gravitational analysis, X-ray phase analysis, and X-ray structural analysis, conducted to determine the composition, structure and properties of the double complex salts -tetra(isotiocyanato)diaminechromates(III) of complex lanthanon(III) of ceric group with hexamethylphosphorotriamide (HMPA) and nitrate-groups as ligands.

Tetraammineplatinum(II) and Tetraamminepalladium(II) Chromates as Precursors of Metal Oxide Catalysts

“…The use of metalc omplex salts as precursors is most convenient becauset he selectiono fs uitable ligandsa nd complexing metals makes it possible to unambiguously set the composition of the final producta nd the ratio of metals, and to obtain as ingle-phase sample with only gaseous substances as byproducts.S election of the atmosphere and temperature regime of precursor decompositiona llows the morphology and phase composition of the final products to be controlled. [5][6][7][8][9][10][11] Decomposition in ah ydrogen atmosphere leads mainly to the formation of metallic systems, whereast he oxide systems are formed in an oxidizinga tmosphere.T he formation of both oxide and metallic systemsi sp ossible in an inert atmosphere, dependingo nt he nature of the complex salts. [8] The thermald ecomposition productso fc omplex compounds are of great interestb ecause they can possess electrically conductive andm agnetic properties, [12] fore xample, the use of the PtÀCr system as ac oating for carbone lectrodes can increase the conductivity and strength of the electrodes, [13] and twolayer films consisting of Cr 2 O 3 and Pt are promising from the point of view of anomalous magnetic behavior near the NØel point.…”

“…The use of metal complex salts as precursors is most convenient because the selection of suitable ligands and complexing metals makes it possible to unambiguously set the composition of the final product and the ratio of metals, and to obtain a single‐phase sample with only gaseous substances as byproducts. Selection of the atmosphere and temperature regime of precursor decomposition allows the morphology and phase composition of the final products to be controlled . Decomposition in a hydrogen atmosphere leads mainly to the formation of metallic systems, whereas the oxide systems are formed in an oxidizing atmosphere.…”

Synthesis and thermal study of dual coordination compound of gadolinium (III) and chromium (III)

“…registration of thermal effects with simultaneous current change of weight of the sample) allows controlling the processes of dehydration, removing volatile compounds, as well as binder burnout. The obtained data make it possible to determine the enthalpy of phase transitions with exact reference to the temperatures of reactions [7][8][9][10] …”