Binuclear μ-Perchlorato Complexes of Alkaline Earth Metal Ions Studied by Electrospray Ionization Mass Spectrometry and DFT Calculations

Abstract

Abstract Metal-ion clusters involving alkaline earth metal and perchlorate ions, and N,N-dimethylformamide (DMF) have been studied by electrospray ionization mass spectrometry (ESI-MS). Three types of metal-ion clusters, [M(DMF)n]2+, [M(ClO4)(DMF)n]+, and [M2(ClO4)3(DMF)n]+ (M = Mg, Ca, and Sr) are found. It is proposed on the basis of DFT calculations that the metal ion in the [M2(ClO4)3(DMF)6]+ clusters is six-coordinated with three μ-ClO4− ions and three DMF molecules.