Abstract
Formation of complexes between the cations (Li +, Na +, K +, Rb + and Cs +) and three lasalocid esters was studied by electron spray ionization (ESI) mass spectrometry and the PM5 semiempirical method. The structures of the complexes are discussed. The 1:1 and 1:2 stoichiometry structures of the complexes are favoured. Under ESI conditions, the formation of stable fragment complexes with the involvement of polyoxaalkyl chains was observed, demonstrating the importance of these chains in the complexation process. These results also confirmed that the complexes of lasalocid polyoxaalkyl esters with monovalent cations existed in the keto equilibrium form.
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