First example of dissymmetrical lanthanide cryptates: synthesis and steady state photophysical properties

A new cryptate incorporating an unsymmetrical arch as 6-methyl-2-[3-(methyl)pyrazol-1′-yl]pyridine has been obtained in a good yield. The effect of the dissymmetry introduced by the pyrazole moiety on the corresponding Eu(III), Tb(III) and Sm(III) complex fluorescence behavior is discussed.