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. 2017 Oct 16;7(1):13212.
doi: 10.1038/s41598-017-12980-6.

One Dimensional Coordination Polymer of Zn(II) for Developing Multifunctional Nanoparticles

Rashmi A Agarwal  1
Affiliations

One Dimensional Coordination Polymer of Zn(II) for Developing Multifunctional Nanoparticles

Rashmi A Agarwal. Sci Rep. .

Abstract

A variety of nanoparticles (NPs) including Ag, Au, Pd, Cr and mixed Cu/Fe have been synthesized in a non-activated (without solvent removal) one dimensional coordination polymer (CP) of Zn(II) via two different mechanisms, acid formation and redox activity of the framework. Main driving force to grow these NPs within the cavities of CP is the presence of free oxygens of one of the monodentate carboxylate groups of BDC ligand. These free oxygens act as anchoring sites for the metal ions of the metal precursors. Chemical and physical characteristics of the NPs within the framework have been evaluated by the high resolution transmission electron microscopic (HRTEM) images. Excluding Ag(0) and Pd(0) other NPs are present as combinations of their elemental as well as oxide forms (Au/Au2O3, Cr/Cr2O3/CrO2 and Cu/Cu2O, Fe/FeO). Synthesized Ag NPs within the framework show remarkable antibacterial efficacy at extremely low concentrations. Ag, Au and Cu/Fe NPs show ferromagnetic properties within the framework at room temperature. This polymer has potential to sequester highly toxic Cr(VI) to non toxic Cr(0), Cr(III) and Cr(IV) species.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Figure 1
Figure 1
Crystal strucrure of Zn-PCP. (a) Coordination environment around metal centre, (b) packing of 1D ladders in to 3D structure. (c) Space filled diagram. (d) and (e) Hydrogen bonding interactions between two adjacent ladders.
Figure 2
Figure 2
PXRD patterns. (a) Host template (Zn-PCP). (b) Ag@Zn-PCP. (c) Au/Au2O3@Zn-PCP. (d) Pd@Zn-PCP. (e) Cr/Cr2O3/CrO2@Zn-PCP. (f) Cu/Cu2O,Fe/FeO@Zn-PCP.
Figure 3
Figure 3
HRTEM and HAADF-STEM images of Ag@Zn-PCP showing that Ag NPs are present within the polymer with clearly visible lattice fringes.
Figure 4
Figure 4
HRTEM and HAADF-STEM images of Au/Au2O3@Zn-PCP with clearly visible lattice fringes of Au/Au2O3.
Figure 5
Figure 5
E. coli bacterium growth inhibition by Ag@Zn-PCP.
Figure 6
Figure 6
Magnetization curves at room temperature. (a) Ag@Zn-PCP. (b) Au/Au2O3@Zn-PCP. (c) Cu/Cu2O, Fe/FeO@Zn-PCP.
Figure 7
Figure 7
UV-vis spectra. (a) Black line for 1000 ppm aqueous solution of K2Cr2O7; red line for 1 h; blue line for 2 h; pink line for 4 h; green line for 10 h treatment with Zn-PCP. (b) Black line for 2000 ppm aqueous solution of K2Cr2O7; red line for 1 h; blue line for 2 h; pink line for 4 h; green line for 10 h treatment with Zn-PCP. (c) Absorbance of 1000 ppm aqueous solution of KOH.
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