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. 2019 Sep 17;4(14):16068-16079.
doi: 10.1021/acsomega.9b02268. eCollection 2019 Oct 1.

Synthesis of Two Mononuclear Schiff Base Metal (M = Fe, Cu) Complexes: MOF Structure, Dye Degradation, H2O2 Sensing, and DNA Binding Property

Mithun Kumar Ghosh  1 , Sayantan Pathak  2 , Tanmay Kumar Ghorai  1
Affiliations

Synthesis of Two Mononuclear Schiff Base Metal (M = Fe, Cu) Complexes: MOF Structure, Dye Degradation, H2O2 Sensing, and DNA Binding Property

Mithun Kumar Ghosh et al. ACS Omega. .

Abstract

O-Vanillin and ethylenediamine were used for the synthesis of N,N'-bis(O-vanillinidene)ethylenediamine (O-VEDH2) Schiff base ligand, which was characterized by UV-visible and 1H NMR spectroscopy. The Schiff base ligand O-VEDH2 has been employed to synthesize novel [C18H22FeN2O6]NO3 (1) and C18H16CuN2O5 (2) complexes by the simple slow evaporation method. The single crystals were characterized by X-ray crystallography, as well as Fourier-transform infrared and UV-visible spectroscopy techniques. Complexes 1 and 2 crystallize in monoclinic and orthorhombic space groups with P121/n1 (14) and Pnma (62) point groups, respectively, and both show metal-organic frameworks like structures. Complexes 1 and 2 have optical band gaps of 4.1 and 2.9 eV, respectively, indicating their semiconducting properties. The dye degradation activity and H2O2 sensing of the complexes 1 and 2 were determined in different conditions. The photocatalytic test was performed in the presence of sunlight, methylene blue (MB), and complexes 1 and 2. An interesting result was obtained that complex 2 has degradation ability against MB and the rate constant (K) is 5.46 × 10-5 s-1, whereas complex 1 has H2O2 sensing properties. Both complexes are bound to Calf-thymus DNA by intercalation binding mode, and binding constants (K b) of complexes 1 and 2 are 3.77 × 103 and 1.49 × 104 M-1, respectively.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
(a) Complex 1 and (b) complex 2.
Figure 2
Figure 2
(a) Intra- and intermolecular H-bonding and (b) van der Waals interaction of complex 1.
Figure 3
Figure 3
(a) van der Waals interaction and (b) asymmetric unit of complex 2.
Figure 4
Figure 4
MOF at (010) b axis in central projection for (a) complex 1 and (b) complex 2.
Figure 5
Figure 5
Band gap energies of (a) complex 1 and (b) complex 2.
Figure 6
Figure 6
(a) Kinetics of the dye degradation and (b) MB degradation by complex 2 and rate of reaction.
Figure 7
Figure 7
Possible mechanism and reason for dye degradation by complex 2 in the presence of sunlight.
Figure 8
Figure 8
H2O2 sensing by Complex 1.
Figure 9
Figure 9
Absorption spectra of complexes in the absence and presence of CT-DNA: (a) complex 1 and (b) complex 2.
Scheme 1
Scheme 1. Preparation of Schiff Base Ligand N,N′-Bis(O-vanillinidene)ethylenediamine (O-VEDH2)
See this image and copyright information in PMC

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