Synthesis Of Functional Complexes And Related Performance

The design, synthesis and characterization of a series of target complexes, as a basis of this paper, focus on systematically dealing with the magnetic properties, biological activities and the thermal decomposition kinetics of them, according to the main routes of designing magnetic molecules.1. Three new u-tetracarboxylatobenzene binuclear copper( II) complexes have been synthesized and characterized. The general synthetic pathway for the complexationon may be represented by the following equationThe results have confirmed that the complexes have tetracarboxylatobenzene-bridged structures consisting of planar copper( II) ions. The temperature dependence of magnetic susceptibilities of the complex [Cu2(PMTA)(en)2](ClO4), was measured and analyzed over the range 4-300K, the antibacterial activity of these three complexes were also examined , demonstrating that there is a very weakly antiferromagnetic spin-exchange interaction between the two copper( II) ions within each molecule, and the antibacterial activities of all the binuclear complexes are superior to the ligand.2. Three new chloranilato-bridged chromium (Ill)-chromium (III) binuclear complexes have been synthesized and characterized. The reaction may be expressed as the following equation:Based on elemental analyses, IR electronic specteral, molar conductance, room temperature magnetic moment and variable temperature magnetic susceptibility(4-300K) measurements, these complexes are proposed to have chloranilato-bridged structures consisting of octahedral chromium(III) ions. The variable temperature magnetic susceptibilities (4-300K) of complex [Cr:(CA)-(ph-phen)J(SO4), was further measured and studied, demonstrating the anti-ferromagnetic interaction between the adjacent two chromium( II) ions. the exchange integrals ( J ) were evaluated as -3.15cm1.3. Three new n -oxamido-bridged heterobinuclear copper ( 11 ) complexes have been synthesized and characterized. The reaction can be expressed just as the following equation:It is proposed that these complexes have oxamido-bridged structures consisting of planar copper(II) and octahedral chromium (III) ions. The variable temperature, magnetic susceptibilities (4-3OOK) of complexes [Cu(Me:oxpn)Cr(Mephen)2](NO3)5 (1) and [Cu(Me2oxpn)Cr(Mephen)-,](NO3)-; (2) were further measured, demonstrating the ferromagnetic interaction between the adjacent chromium(III) and copper( II) ions through the oxamido-bridge. Basedon the spin Hamiltanian operation, H = -2 JS, 5\ , the exchangeintegrals (J) were evaluated as +21.5 cm for (1) and +22.8 cm1 for (2).4. The thermal decomposition of N, N-bis(2-aminoethyI)-CKamido-copper (II) complex under dynamic air atmosphere was studied by TG. DTG and DTA techniques. The nonisothermal kinetics data were analvzed bv means of the Achar method and the Coats-Redfen method.The most probable kinetic model function was suggested, by comparison of the kinetic parameters. The mathematical expressions of E and InA were derived from the kinetic compensation effects.In this paper, elemental analyses, IR electronic spectral, molar conductance, room temperature magnetic moment and variable temperature magnetic susceptibility (4-3 00K) measurements have been used to characterize the complexes synthesized through various means. Based on the coordinate field theory and molecular orbital theory' and quantum chemical methods, the structures , the quantity and the quality of the spine exchange interaction of the complexes have been proposed. Biological activities and the thermal decomposition kinetics have also been studied.