Nucleophilic substitution in β chlorovinyl phenyl ketone with diaza 18 crown 6 ether resulting in displacement of the chlorine atom afforded N,N´ bis(3 oxo 3 phenylpropen 1 yl) 1,10 diaza 18 crown 6 ether. The ability of the latter to form complexes with a number of metal cations was studied. However, the complex formation occurs only with the rare earth cations Ln 3+ and Th 4+ . This fact was demonstrated by UV and 1 H NMR spectroscopy of solutions, confirmed by isolations of glassy phases of composition L 3 M 2 (NO 3 ) 6 •nH 2 O (M = La, Y, n ≈ 4-7), and supported by IR spectra of these phases in KBr pellets. The formation of complexes with La 3+ and Y 3+ leads to an increase in fluorescence intensity of the ligand. The stability constants of the 1 : 1 complexes in methanol were evaluated by spectro photometry. These constants increase with decreasing ionic radius of the cation.
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