Synthesis, Crystal Structure, and Properties of a Zn(II) Coordination Polymer Based on a Difunctional Ligand Containing Triazolyl and Carboxyl Groups

Abstract

A new compound, namely, [Zn(L)2]n (1) was obtained by the reaction of 2-methyl-4-(4H-1,2,4-triazol-4-yl) benzoic acid (HL) with ZnSO4·7H2O, and the compound was characterized by single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, powder X-ray diffraction (PXRD), and thermogravimetric analysis. The linear HL ligands were deprotonated to be L− anions and act as two-connectors to link Zn2+ to form a two-dimensional (2D) lay structure with (4, 4) topology. The large vacancy of 2D framework allows another layer structure to interpenetrate, resulting in the formation of 2D + 2D → 2D parallel interpenetration in 1. The weak interactions, such as hydrogen bonding and π–π stacking interactions, connect the adjacent 2D layers into a three-dimensional (3D) coordination polymer. The solid-state UV-visible spectroscopy and luminescent property have also been studied.

A Cd(II) Coordination Polymer Based on Mixed Ligands: Synthesis, Crystal Structure, and Properties

“…In addition to the rich hydrogen bonding, classic weak π−π stacking interactions could also be found between the neighboring 2D packing layers. The five-membered furan rings of the frda 2ligands were completely parallel with the centroid−centroid distance of 3.49 Å, indicating the existence of strong π−π stacking interactions [32,33]. On the whole, the weak interactions including the hydrogen bonding and π−π stacking interactions progress adjacent 2D layers into a three-dimensional (3D) supramolecular polymer ( Figure 4).…”

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications

“…also reported two 2D MOFs with sql net, [Zn 2 (muco) 2 (azopy) 2 ]·3DMF·2H 2 O and [Cd­(muco)­(4bpdh)­(H 2 O)], based on trans , trans -muconate dianion (muco) and different linkers 4,4′-bisazobipyridine (azopy) and 2,5-bis­(4-pyridyl)-3,4-diaza-2,4-hexadiene (4bpdh), respectively. , The former one exhibits 2-fold interpenetration, while the latter displays 3-fold interpenetration (Figure ). Several other 2D MOFs of this type are reported in the recent literature. ,− …”