Issue 14, 2018, Issue in Progress

Assembly of a series of zinc coordination polymers based on 5-functionalized isophthalic acids and dipyridyl

Abstract

To investigate the influence of different 5-functionalized isophthalate ligands on the self-assembly and structures of Zn(II)-based coordination polymers (CPs), we selected four 5-functionalized isophthalate ligands coordinated with 4,4′-bipyridyl (bpy) and Zn(II) salt, and four new CPs, namely, {[Zn(EtOip)(bpy)]·2H2O}n (1), {[Zn(PrOip)(bpy)]·2H2O}n (2), [Zn(nBuOip)(bpy)]n (3) and [Zn(nPeOip)(bpy)]n (4) (where EtOip = 5-ethoxyisophthalate, PrOip = 5-n-propoxyisophthalate, nBuOip = 5-n-butoxyisophthalate and nPeOip = 5-n-pentyloxyisophthalate), were prepared under hydrothermal conditions. Moreover, we considered changing the features of the N-ligands (length), which are expected to alter the structural diversities and properties of the resultant CPs. We used 1,2-bis(4-pyridyl)ethene (bpe) to replace bpy; and obtained four new coordination polymers (CPs), namely, {[Zn(EtOip)(bpe)]·H2O}n (5), {[Zn(PrOip)(bpe)]·H2O}n (6), {[Zn(nBuOip)(bpe)]·0.5DMF}n (7) and [Zn(nPeOip)(bpe)]n (8). All of these compounds were characterized by single crystal X-ray diffraction, infrared spectroscopy, elemental analysis and powder X-ray diffraction measurements. Single-crystal X-ray analysis reveals that the structure of complexes 1–4 are very similar, although different functionalized-isophthalate ligands are employed. Complexes 5, 6 and 7 possess a two-dimensional (2D) layered structure, and the 2D framework of complexes 5 and 7 can be rationalized to be a threefold interpenetrating four-connected {44·62} topological sql network, while 6 exhibits a twofold interpenetrating 4-connected 2D framework. Compound 8 features a 6-connected 3D topology net based on a novel bimetallic unit [(Zn)2(CO2)2] linked by mixed nPeOip and bpe ligands. Moreover, thermal and photoluminescence properties of the synthesized complexes were also studied in detail.

Graphical abstract: Assembly of a series of zinc coordination polymers based on 5-functionalized isophthalic acids and dipyridyl

Supplementary files

Article information

Article type
Paper
Submitted
29 Nov 2017
Accepted
06 Feb 2018
First published
16 Feb 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 7428-7437

Assembly of a series of zinc coordination polymers based on 5-functionalized isophthalic acids and dipyridyl

T. Wang, R. Zhu, X. Zhang, T. Yan, Q. Wang, J. Feng, J. Zhou, L. Du and Q. Zhao, RSC Adv., 2018, 8, 7428 DOI: 10.1039/C7RA12874F

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