Reactions in water
of lanthanide chlorides with
the sodium salt of 1,4-carboxyphenylboronic acid lead to two series
of isostructural compounds with respective general chemical formulas
[Ln(cpb)3(H2O)2]∞ for Ln = La or Ce and [Ln(cpbOH)(H2O)2·(cpb)]∞ for Ln = Pr–Lu (except Pm) plus Y. Heterolanthanide
coordination polymers that are isostructural to the second series
have been synthesized, and their photophysical properties have been
studied. This study evidences that it is possible to design multiemissive
lanthanide-based coordination polymers that could find their application
as multigauge luminescent thermometric probes.
Microcrystalline
core–shell powders of lanthanide-based
coordination polymers with general chemical formula ([Ln(cpbOH)]∞)1–x
@([Ln′(cpbOH)]∞)
x
with Hcpb = 1,4-carboxyphenylboronic
acid have been synthesized and structurally characterized. Their luminescent
properties have been studied. They are drastically different from
those of heterolanthanide coordination polymers, also called “molecular
alloys”, that present the same crystal structure and chemical
composition. Study of the photophysical properties of core–shell
lanthanide-based coordination polymers reveals that it is possible
to control efficiently the intermetallic energy transfers between
lanthanide ions. Furthermore, multiemissive compounds, under unique
irradiation, in both visible and infrared regions are easily feasible.
Core–shell microstructured lanthanide-based coordination polymers
have also been prepared with terephthalic (H2bdc) and trimesic
(H3tma) acids as ligands for evidencing that lanthanide-ion-based
coordination compounds are excellent candidates for 3D molecular epitaxial
growth.
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