Mechanochemical synthesis of some europium diketonates

Abstract

Results on the influence of mechanoactivation (3-30 min) in a planetary ball mill on the composition, crystal structure, IR spectra and morphology of EuCl3•6H2O, dibenzoylmethane (HDBM) and mixtures of EuCl 3•6H2O - HDBM and EuCl3•6H 2O - HDBM - 1,10-phenathroline (phen) are presented. Mechanoactivation leads to a decrease of interplanar distances of the EuCl 3•6H2O and HDBM and partial synthesis of Eu(DBM) 3 and Eu(DBM)3•phen in the respective mixtures. The fluorescence properties of the products of activation (excitation and emission spectra, lifetime of the excited states) are similar to those of the complexes produced by the conventional "wet" methods, but the strongest excitation of the mechanochemically produced solid state samples is achieved at higher wavelength. Crystals of different forms (prismatic, needle-, long-length-leaf- and rod- like) are formed by mechanoactivation of the mentioned mixtures. © Versita Sp. z o.o.