Structural diversity and photoluminescent properties of two zinc coordination polymers based on 5-i-propoxyisophthalate and flexible N-donor ligands

Abstract

Two new zinc coordination polymers, {[Zn(iPrIPA)(bpa)]⋅2H₂O}_n (1) and [Zn₂(iPrIPA)₂(bpp)]_n (2) (iPrIPA = 5-i-propoxyisophthalate, bpa = 1,2-bis(4-pyridyl) ethane, bpp = 1,3-bis(4-pyridyl)propane), have been synthesized under hydrothermal conditions. Complexes 1 and 2 represent 3-D polythreaded supra molecular architecture consisting of corrugated 2D layer for complexes 1 and a 2D network consisting of alternating Zn1 binuclear and paddel-wheel Zn2 binuclear units for compound 2. The structural comparison of these two complexes demonstrates that the characteristics of auxiliary ligands play a key role in governing the coordination motifs and the final supramolecular lattices. Fluorescence emission and room temperature phosphorescence (RTP) behavior of 1 and 2 were also investigated.

Keywords:

• 5-i-propoxyisophthalate
• zinc coordination polymer
• room temperature phosphorescence (RTP)

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (grant no. 21801111) and Key Scientific Research Projects of Higher Education of He’nan Province (grant no. 19A150034).