Two novel Cadmium(II)‐based luminescent metal‐organic frameworks (LMOFs), namely, {[Cd(tipe)0.5(OBA)]⋅(H2O)5} [tipe=1,1,2,2‐tetrakis(4‐(1H‐imidazol‐1‐yl)phenyl)ethene, OBA=4,4‐oxoybis(benzoic acid)] (MOF‐1) and [Cd2(tipe)(SDC)2] (SDC=4,4′‐stilbenedicarboxylic acid) (MOF‐2), have been prepared by a tetraphenylethene (TPE)‐core ligand under hydrothermal condition. Results of single crystal X‐ray diffraction show that MOF‐1 crystallizes in monoclinic system and MOF‐2 crystallizes in the triclinic system. And two complexes all have blue emission with maximal peaks at 488 nm (MOF‐1) and 477 nm (MOF‐2), respectively. Solvent exchange experiments show that they are stable in most of organic solvents. As to MOF‐1, there exist different degrees of quenching or different stokes shifts in these solvents. It proves that MOF‐1 can have potential application in sensing organic solvents. Due to MOF‐2’s structural intercalation, the presence of organic solvents causes a large degree of quenching of fluorescence because they take part in photo‐induced electron transfer (PET) process.
The luminescent complexes [Cd(BIMP)2(NDC)2]n and [Zn(BIMP)2(NDC)]n (where (3-BIMP) = 3-(1H-benzoimidazol-2-yl)pyridin-2(1H)-one and NDC = 2,6-naphthalenedicarboxylic acid) have been synthesised under hydrothermal conditions and their crystal structures determined. [Cd(BIMP)2(NDC)2]n exhibited a 1D → 2D → 3D framework structure and [Zn(BIMP)2(NDC)]n has a 3D porous structure. Under the same excitation energy (λex = 389 nm), [Zn(BIMP)2(NDC)]n showed a stronger fluorescence emission than the free 3-BIMP ligand, the NDC ligand and [Cd(BIMP)2(NDC)2]n.
Herein, we report
the synthesis of two new manganese-based luminescent
metal–organic frameworks (LMOFs) [Mn
0.5
(tipe)(1,4-ndc)]
n
(
1
) and [Mn(tipe)(1,4-ndc) (H
2
O)·(DMF)
2
·(H
2
O)
3
]
n
(
2
) [tipe = 1,1,2,2-tetrakis(4-(1
H
-imidazol-1-yl)phenyl)ethene (tipe) and 1,4-ndc = 1,4-naphthalenedicarboxylic
acid] constructed from an aggregation-induced emission (AIE) chromophore
ligand. Compound
1
can undergo a facile single-crystal-to-single-crystal
transformation to form compound
2
, which results in an
increase in dimensionality from a two-dimensional (2D) network to
a three-dimensional (3D) network. Both compounds demonstrate excellent
performance for the solution-phase detection of Fe
3+
ions
through a significant and rapid quench in luminescence emission. Fluorescence
titration experiments reveal that compound
2
is more
selective toward Fe
3+
compared to compound
1
because of its 3D stacking mode. The
K
sv
value for compound
2
(32 378 M
–1
) is twice as large as that for compound
1
(15 854
M
–1
) for the detection of Fe
3+
ions.
We attribute this significant increase in performance to the increase
in dimensionality. In addition, compound
2
demonstrates
high selectivity and sensitivity for the detection of Cr
3+
cations and Cr
2
O
7
2–
anions.
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