THE THERMODYNAMICS OF 1,4,7,10,13-PENTAAZATRIDECANE COMPLEXES OF SILVER(I) IN DIMETHYL-SULFOXIDE

The thermodynamic parameters Delta G degrees, Delta H degrees and Delt a S degrees for the formation of silver(I) mononuclear (AgL(+)) and po lynuclear ([Ag(2)L](2+), [Ag(3)L(2)](3+)) complexes with 1,4,7,10,13-p entaazatridecane (L = tetren) have been obtained in dimethyl sulfoxide (dmso) at 25 degrees C and in an ionic medium of 0.1 mol dm(-3). The complexes are enthalpy stabilized while the entropy contributions oppo se their formation. Tetren, differently from other linear polyamines w hich have only aminoethylenic subunits and less than Eve nitrogens, is able to form polynuclear species in dmso. Structures and stabilities of the complexes are discussed in relation to the characteristics of t he ligand.