Two novel Zn(II) coordination polymers constructed by the same dicarboxylate and different bis-imidazole as co-ligand: Syntheses, crystal structures and properties

Two novel Zn(II) coordination polymers, { [Zn(mu-HBCPT)(mu-1,3-BIP)] middot2H2O middotDMF}n (SNUT-7) and { [Zn2(mu 3- BCPT)(HCOO)(mu-1,3-BMIP)2]n (SNUT-8), where 1,3-BIP is a 1,3-bis(1H-imidazol-1-yl)propane, 1,3-BMIP is 1,3-bis(2-methyl-1H-imidazol-1-yl)propane, H3BCPT is 3,5-bis(4'-carboxy-phenyl)-1,2,4-triazole and for-mate (HCOO -) ligands, were prepared under solvothermal conditions and characterized by single-crystal and powder X-ray diffraction, IR spectra, thermogravimetric analysis and elemental analysis. SNUT-7 ex-hibits a 2D -> 2D interspersed with each other, which can be further expanded into 3D supramolecule through hydrogen bonds. SNUT-8 exhibits a rare 2D + 2D -> 3D framework structure. SNUT-7 and SNUT-8 are efficient and universal photocatalysts for the degradation of organic dye rhodamine B (Rh B) under visible light irradiation. The degradation of SNUT-7 and SNUT-8 are near-82.79% and-68%. SNUT-7 and SNUT-8 also show stronger blue light emission than the H3BCPT ligand. At room temperature, SNUT-7 and SNUT-8 have the highest emission peaks at 371 and 363 nm upon excitation at 360 and 290 nm.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

Two novel Zn(II) coordination polymers were synthesized and characterized. They exhibit efficient and universal photocatalytic activity for the degradation of organic dye rhodamine B under visible light irradiation, and also show stronger blue light emission than the H3BCPT ligand.