PHYSICAL PARAMETERS OF SYNTHESIZED HETEROMETALLIC COMPLEX COMPOUND

Abstract

A  new synthesized semiconductor material has been used as a material sensitive to the effects of temperature or magnetic field. The synthesis  technique of heterometallic µ-isopropoxy-(copper(II), bismuth(III)) acetylacetonate (I) is presented in the paper. Using element analysis as well as IR-spectroscopy, magneto-chemical and thermo gravimetric researches the composition of the synthesized heterometallic µ-isopropoxy (copper(II), bismuth(III)) acetylacetonate  have been examined. It corresponds to the chemical formula: [Cu₃Bi(С₅Н₇О₂)₄(OC₂H₅)₅], where
С₅Н₇О₂ = H₃C–C(O)–CH–C(O^-)–CH₃. The practical output is 82 % of the  theoretical  calculated one. The synthesized complex compound (I) is a fine crystalline powder, which has good solubility in a mixture of DMFA with chloroform (1:1) and worse solubility in alcohols, ether, better solubility in DMFA, and can be destroyed in water. An analysis of the experimental data from physical and chemical studies for compound (I) allowed to propose a chemical bonding scheme. The molecule of heterometallic µ-izopropoxy- (cuprum (II), bismuth (III)) acetylacetonate probably is a cube, and at the top of which there are three copper atoms (II) and one atom bismuth (III) linked to the atoms of oxygen of isopropoxy- groups, which acts as the tridentate ligand. For the isolated complex compound [Cu₃Bi(C₅H₇O₂)₄(OC₃H₇-i)₅], a molar mass equal to 1090.5 g/mol and a calculated  number of valence electrons in one molecule is 289. A cylindrical sample of mass 0.14 g and a volume of 17.67∙10^-9 m³ made of complex compound (I) by pressing was used for experimental studies. Experimental studies of the conductive properties of µ-isopropoxy- copper (II), bismuth(III)) acetylacetonate in the temperature range 313 K÷413 K, in compressed form, showed that at increased temperature its resistivity sharply decreases from 7·1010 to 4·10² Ohm∙cm.  The operating temperature range is from +273 K to +493 K, with the decomposition of the chemical compound from 523 K. The concentration of charge carriers increases from 1.3·10¹⁹ m^-3 at 273 K to 3.395·10³⁶ m^-3 at 493 K, while at the quantum Hall constant with increasing temperature from 273 K to 493 K decreases from 0.566 m³·Kl^-1 to 2.167·10^-18m³·Kl^-1. The Hall voltage in the magnetic field range from 0 to 1000 mT varies from 8.32·10^-14 to 8.32·10^-12 V.