Gold nanoparticle decorated post-synthesis modified UiO-66-NH2 for A(3)-coupling preparation of propargyl amines

In this report, the novel UiO-66-NH2 based-MOF(Zr) catalytic system which further modified with nitrogen-rich organic ligand (5-aminotetrazole) using post synthetic modification (PSM) approach has been prepared here as an efficient catalyst to promote the A(3)-coupling preparation of propargyl amines in green aquatic media. This newly highly efficient catalyst was synthesized upon Zr-based MOF (UiO-66-NH2) which successfully functionalized with 2,4,6-trichloro-1,3,5-triazine (TCT) and 5-aminotetrazole, following through stabilization of gold metal (Au) nanopartilces. The addition of N-rich organic ligand through post-synthesis modification which can be assisted to stabilize the bister and stable gold nanoparticles caused to unique structure of the final composite in favor of the progress of the A(3) coupling reaction. Also several strategies comprising XRD, FT-IR, SEM, BET, TEM, TGA, ICP, EDS and elemental mapping analyzes, were used to indicate the successful preparation of the UiO-66-NH2@ Cyanuric Chloride@ 5-amino tetrazole/Au-NPs. The results of productivity catalyst are accomplished in good to excellent yields for all sort of reactions under mild conditions which is a proof of superior activity heterogeneous catalyst containing Au-nanoparticles. In addition, the suggested catalyst represented excellent reusability with no remarkable loss in activity up 9 sequential runs.

Automated summary

In this report, a novel UiO-66-NH2 based-MOF(Zr) catalytic system modified with nitrogen-rich organic ligand (5-aminotetrazole) using post synthetic modification (PSM) approach has been prepared and used as an efficient catalyst for the A(3)-coupling preparation of propargyl amines in green aquatic media. The addition of the nitrogen-rich organic ligand resulted in the stabilization of gold nanoparticles and the unique structure of the final composite, promoting the A(3) coupling reaction. The synthesized catalyst showed superior activity and reusability in multiple reactions.