Using 2,4-bis-(triazol-1-yl)-benzoic
acid as the main ligand and
terephthalic acid (TPA) as the auxiliary ligand, combined with Cd(NO
3
)
2
·4H
2
O and Zn(NO
3
)
2
·6H
2
O, self-assembly under solvothermal conditions
gave three novel complexes: [Cd
0.5
(L)(H
2
O)]
(
1
), [Cd(L)(TPA)
0.5
(H
2
O)]·H
2
O (
2
), and [Zn(L)(TPA)
0.5
]·H
2
O (
3
) (TPA = terephthalic acid). The crystal
structure test showed that complex
1
belongs to the triclinic
crystal system and the
P
1̅ space group and
complexes
2
and
3
belong to the monoclinic
crystal system and the
P
2
1
/
c
space group. Solid-state fluorescence experiments show that complexes
1
,
2
, and
3
all have excellent optical
properties: among them, complexes
1
and
3
can selectively detect MnO
4
–
with low
detection limits (0.96 μM and 0.232 μM, respectively)
and complex
2
can detect Cr
2
O
7
2–
[limit of detection (LOD) = 0.035 μM], and
the most interesting thing is that all three complexes can be used
as sensors for detecting Fe
3+
(LOD = 0.76 μM, 0.657
μM, and 0.11 μM, respectively). In addition, the detection
capabilities of these three complexes for different amino acids and
antibiotics were also analyzed, and the results showed that all three
complexes can effectively detect tetracycline hydrochloride through
the quenching effect and
2
and
3
can selectively
detect tryptophan via the fluorescence enhancement effect.
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