Discrete Octamer Water Cluster and 1D T5(2) Water Tape Trapped in Two Luminescent Zn(II)/1,2-Bis(imidazol-1′-yl)ethane/Dicarboxylate Hosts: From 2D (4,4) Net to 3D 5-Fold Interpenetrated Diamond Network

Abstract

Two new mixed-ligand Zn(II) coordination polymers, namely, [Zn(bime)(glu)·4H2O] n (1) and [Zn(bime)(sub)·3H2O] n (2) (bime = 1,2-bis(imidazol-1′-yl)ethane, H2glu = glutaric acid, H2sub = suberic acid), have been synthesized and structurally characterized. Complex 1 exhibits a wavy two-dimensional (2D) sheet with (4,4) topology. Complex 2 is a three-dimensional (3D) framework with 5-fold interpenetrated diamond topology. Of particular interest, a discrete octamer water cluster comprised of a chairlike hexamer water cluster with two extra water molecules dangling on two diagonally vertices of the chair was observed in the grid of the 2D sheet of 1. In 2, a 1D infinite T5(2) water tape constructed from edge-sharing pentamer water clusters accommodates in the channels of the 3D network. The results suggest that the dicarboxylates play crucial roles in the formation of the different host structures as well as different guest water aggregations. Additionally, the thermal stabilities and photoluminescence spectra of them were discussed.

Self‐assembly of a luminescent Zn(II) carboxylate with the diamondoid topology

“…Bond lengths and angles of Zn center are given in Table . The Zn‐O distances are 1.9528(14) and 1.9780(15) Å, and Zn‐N distances are 2.0346(17) and 2.0378(17) Å, which are in agreement with those observed in other structures . The maximum and minimum bond angles for Zn are 133.84(5) and 99.75(6)°, with an average of 109.02(8)°, which slightly deviates from the angle of 109.47° in a perfect tetrahedron.…”

Encapsulation of a Water Octamer Chain in a Chiral 2D Sheetlike Supramolecular Coordination Network Composed of Dinickel–Dicarboxylate Subunits

“…Therefore, it is observed that the octameric chain of water is encapsulated between the hydrogen-bonded 2D sheets of the dimeric units of 1 through strong hydrogen bonding (as shown in Figure 6). In 1 , the O···O distance varies from 2.6620 to 2.7492 Å; these parameters are comparable to those for ice, where the O···O distance is 2.783 Å 25,48,49 and the O···O···O angles vary from 96.64 to 152.09°. This arrangement enhances the stability of the water chain as evident from the thermal behavior of 1 (vide infra).…”

Effect of the Spacer Chain Length of Organic Dicarboxylic Acid on the Supramolecular Assembly of Two Ternary Zinc (II) Coordination Polymers Derived from Mixed Ligands

“…The solid‐state photoluminescence spectra of CPs 1 and 2 and ligand L are shown in Figure . It is known that the π*→n electron transition in carboxylate acid is far weaker than the π*→π electron transition in the L ligand . Therefore, the photoluminescence phenomena of CPs 1 and 2 are mainly related to metal ions and the N‐donor ligand.…”