Magnetic,Electrochemical and Antimicrobial Properties of Some Cu(II)Complexes with TPMC

摘要

Three complexes:[Cu_2(C_6H_5COO)tpmc](ClO_4)_3 dentre dot CH_3OH,(A),(tptnc=N,N',N",N'"-tetrakis(2-pyridilrnethyl)-l,4,8,11-tetraazacyclotetradecane),[Cu_2(Hpht)tpmc](ClO_4)_3 centre dot 3H_2O(H_2pht=phtalic acid)(B)and [Cu_4(ipht)(tpmc)_2](ClO_4)_6 centre dot NaClO_4-2CH_3CN(H_2ipht=isophtalic acid)(C)previously described were investigated by magnetic measurements,cyclic voltammetry(CV)and were tested towards some strains of microorganisms.It is found that all three complexes were electrochemically stable in the investigated ranges.The least stable was mu-ipht-complex(C)due to the reaction of central ion,which is seen from weak peaks in its cyclic voltammogram.Complexes were characterized by variable temperature magnetic measurements(4.2-300 K)and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator,H=-2JS_1S_2,giving the ferromagnetic exchange parameters J=0.92 cm~(-1)for A,J=0.55 cm~(-1)for B and J=0.65 cm~(-1)for C.For the complex C model of molecular magnet with two magnetically isolated dimeric sub-units was used.These results indicate the presence of weak ferromagnetic spin exchange interaction between the Cu~(II)magnetic centers within each molecule.