Existing
core–shell structured metal–organic frameworks
(MOFs) are typically constructed by epitaxial growth with metal or/and
organic ligands (the two basic components for MOFs) changing from
core to shell, whereas in this contribution, we propose a new concept
for constructing core–shell structured MOF featuring hierarchic
encapsulation of various guest molecules into the framework. The cyclodextrin
metal–organic frameworks (CD-MOFs) were chosen as the host
to encapsulate organic dyes for light-emitting applications, and the
cavity structure of γ-cyclodextrin and cage structure of MOF
exhibited remarkable synergistic effects on fluorescence enhancement.
Furthermore, core–shell structured CD-MOFs with hierarchical
encapsulation of different dyes were developed to realize polychromatic
light emitting via spectrum superposition. On the basis of this new
method, we further fabricated a white-light emitting core–shell
crystal, CD-MOF⊃7-HCm@FL@RhB (shell@core). With three sequentially
formed and adjustable layers of different dyes, the core–shell
crystal emitted bright white light with a CIE coordinate of (0.35,
0.32). Our approach provides a new method for the rational design
of multicolor emission crystals. Meanwhile, our findings may stimulate
future investigations on multifunctional host–guest systems
in crystalline state.
The
solubility of dipyridamole p-toluene sulfonate in seven monosolvents
(methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, isobutanol,
2-butanol) and three different binary solvents (methanol + ethanol,
methanol + 1-propanol, methanol + 1-butanol) was measured by a gravimetric
method at temperatures ranging from 288.15 to 328.15 K. The experimental
results indicate that the solubility of dipyridamole p-toluene sulfonate
increases with increasing temperature while showing negative correlation
with the mole fraction of organic solvents (ethanol, 1-propanol, 1-butanol)
at a given temperature in binary solvents. The Apelblat model, the
CNIBS/R-K model, and the modified version of Jouyban-Acree models
(the Apel-JA equation) were used to correlate the experimental data,
and the calculated results of above models were found to agree well
with the experimental data.
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