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. 2021 Aug 2;11(1):15657.
doi: 10.1038/s41598-021-94846-6.

A new silver coordination polymer based on 4,6-diamino-2-pyrimidinethiol: synthesis, characterization and catalytic application in asymmetric Hantzsch synthesis of polyhydroquinolines

Noorullah Hussain-Khil  1 , Arash Ghorbani-Choghamarani  2 , Masoud Mohammadi  1
Affiliations

A new silver coordination polymer based on 4,6-diamino-2-pyrimidinethiol: synthesis, characterization and catalytic application in asymmetric Hantzsch synthesis of polyhydroquinolines

Noorullah Hussain-Khil et al. Sci Rep. .

Abstract

A highly efficient and stable heterogeneous coordination polymer (CP) was successfully prepared by hydrothermal combination of silver and 4,6-diamino-2-pyrimidinethiol. The prepared coordination polymer was characterized by FT-IR, XRD, TGA, SEM, EDX, X-ray mapping and Nitrogen adsorption-desorption analysis. The prepared Ag-CP exhibit excellent catalytic activity in multicomponent Hantzsch synthesis of polyhydroquinolines under mild reaction conditions in relatively short reaction times. The heterogeneity of the catalyst was confirmed by the hot filtration test; also, the catalyst was reused for at least four times under the optimized reaction conditions without any significant loss of its catalytic activity.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Scheme 1
Scheme 1
The synthesis of Ag–CP.
Figure 1
Figure 1
FT-IR Spectrums of (a) 4,6-diamino-2-pyrimidinethiol, (b) Siler nitrate and (c) Ag–CP.
Figure 2
Figure 2
PXRD pattern of Ag–CP.
Figure 3
Figure 3
TGA/DSC curves of Ag–CP.
Figure 4
Figure 4
SEM images of Ag–CP.
Figure 5
Figure 5
EDX Analysis of Ag–CP.
Figure 6
Figure 6
X-ray mapping Analysis of Ag–CP.
Figure 7
Figure 7
N2 adsorption/desorption isotherms of the Ag–CP.
Scheme 2
Scheme 2
Proposed mechanism for the synthesis of polyhydroquinolines in the presence of Ag–CP.
Figure 8
Figure 8
Recyclability of the Ag–CP.
Figure 9
Figure 9
FT-IR spectra of the (a) fresh Ag–CP and (b) spent Ag–CP.
Figure 10
Figure 10
PXRD patterns of the (a) fresh Ag–CP and (b) spent Ag–CP.
See this image and copyright information in PMC

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