Study o f complex ation pro cess betw een ۱۵-crown-۵ w ith Mg۲+ cation in binary mixed non-aqueous solvents using conducto metric m ethod

Crown ethers have drawn mu ch attention because of their ability to selectively bind various cations present in solutions. With this unique property, potenti al applicati ons of crown ethers have be en found i n many div erse and pr actical areas[۱].The sta bility and s electivity o f crown ether complexes with metal ions depen d on several molecu lar factors. These include the cavity size of the legend, the character of the heteroatoms in the polyeth er ring, the spatial distribution of rin g binding sites, the charge density and polarizability of the cation and the cation diameter. O ne of the major factors is also the type of solvent us ed in complexation reactio ns[۲]. The effect of so lvent on th e complexation of cr own ethers with metal cations has been a subject of interest during recent years and has been studied by means of several differen t techniques.The natu re and co mposition o f the solve nt system has been found to strongl y influence the stoichiometry, selectivity, thermodyn amic stability and exchange kinetics of metal i on–crown ether compl exes [۱-۲].

کلیدواژه ها:

۱۵-cr own-۵ ، Mg۲+ cation ، Mixed non-aqueous solvents ، Conductometry