Issue 44, 2021

A tryptophan-based copper(ii) coordination polymer: catalytic activity towards Suzuki–Miyaura cross-coupling reactions

Abstract

Herein, we report the synthesis and crystal structure determination of a new Cu(II) coordination polymer (CP) with the formula [Cu(L-tryp)(azpy)1/2(H2O)(NO3)] (CP1), which exhibits an unusual tryptophan coordination mode with copper(II) via carboxylate monodentate binding as well as chelation via Namino and Ocarbonyl groups. CP1 was prepared using the ligand L-tryptophan (L-tryp) and the co-ligand 4,4′-azopyridine (azpy), adapting the mixed-ligand approach and a solvothermal protocol. Single crystal X-ray structural analysis revealed that in CP1, Cu(II) sites show a distorted octahedral geometry, wherein the ligand L-tryp is coordinated through the carboxylate and amine groups, whereas the co-ligand azpy is coordinated to Cu(II) ions through the Npyridyl atom and thus maintains a distorted octahedral geometry around the Cu(II) ions. FT-IR and EPR spectra were also recorded to corroborate the structural analysis. Finally, CP1 was employed as a heterogeneous catalyst for the Suzuki cross-coupling reaction and afforded ∼98% yield under normal reaction conditions.

Graphical abstract: A tryptophan-based copper(ii) coordination polymer: catalytic activity towards Suzuki–Miyaura cross-coupling reactions

Supplementary files

Article information

Article type
Paper
Submitted
23 Sept. 2021
Accepted
18 Okt. 2021
First published
18 Okt. 2021

CrystEngComm, 2021,23, 7855-7864

A tryptophan-based copper(II) coordination polymer: catalytic activity towards Suzuki–Miyaura cross-coupling reactions

A. Husain, P. Rani, K. K. Nar, A. P. Singh, R. Kumar, K. K. Bhasin and G. Kumar, CrystEngComm, 2021, 23, 7855 DOI: 10.1039/D1CE01282G

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