ic6b01659_si_003.cif (2.16 MB)
Unique EuII Coordination Environments with a Janus Cryptand
dataset
posted on 2016-08-22, 18:03 authored by Guo-Xia Jin, Matthew
D. Bailey, Matthew J. AllenTwo new EuII-containing cryptates were prepared with a new nitrogenous cryptand
functionalized with three benzo groups. The introduction of three
aromatic rings into the ligand backbone imparts lopsided geometrical
features on the resulting EuII coordination environments.
In both complexes, the interactions between Eu and the amines on the
aromatic side of the molecule are weaker than those on the nonaromatic
side, resulting in one discrete unit with two distinct faces. One
of the new complexes is, to the best of our knowledge, the first direct
observation of a bis-aquo EuII-containing cryptate with
two nonadjacent inner-sphere water molecules. In addition to solid-phase
structure, the electronic UV–visible and emission spectra of
the new complexes were studied in acetonitrile. Experimental results
show that the decreased Lewis basicity of the aromatic face hypsochromically
shifts absorbances and emissions from a structurally related compound
without the benzo groups.