Multinuclear coordination polymers based on Ag⋯Ag interaction: syntheses, structures, and luminescence properties

Abstract

A series of coordination polymers based on Ag⋯Ag interactions, namely, [Ag 2 (hpyb) 0.5 (L1) 0.5 (NO 3 benzenetetracarboxylic acid, H 3 L7 = 1,2,4-benzenetricarboxylic acid and H 4 L8 = 4,4′-oxydiphthalic acid) has been synthesized. For compounds 1-4, the polycarboxylate anions bridge multinuclear Ag(I) units to form 1D chains, respectively. The chains are extended by π-π interactions into a 2D supramolecular layer for compound 3 and 3D supramolecular architectures for compounds 1, 2 and 4. Compound 5 displays a 3D (4,8)-connected (3 4 •4 2 )(3 4 •4 12 •5 8 •6 4 ) 2 framework. Compounds 6-8 exhibit 2D layers, where the layers of 6 and 8 are further linked by π-π interactions to yield 3D supramolecular architectures. In the solid state, compounds 1-8 exhibit strong fluorescence emission bands at room temperature.

Syntheses, Crystal Structures, and Properties of Three Novel Silver–Organic Frameworks Assembled from 1,2,3,5-Benzenetetracarboxylic Acid Based on Argentophilic Interactions

“…Ag­(I) is among the most labile metal ion due to its d 10 electronic configuration with versatile coordination number varying from 2 to 9. As documented, silver­(I) ion demonstrates linear, trigonal, square-planar, square-pyramidal, trigonal-bipyramidal, tetrahedral, and octahedral coordination geometries with high affinity to both nitrogen and oxygen atoms. − However, despite the repulsion expected between two closed-shell metal cations, the silver­(I) ion is apt to form short Ag–Ag contacts that have been structurally characterized, range from dimer, trimer, tetramer, and hexamer − to intricate high-nuclearity. − The Ag–Ag contacts play important contribution to the formation of such complexes and thus lead to special properties.…”

Cu- and Ag-Based Metal–Organic Frameworks with 4-Pyranone-2,6-dicarboxylic Acid: Syntheses, Crystal Structures, and Dielectric Properties

“…The Ag–O distances vary in the range of 2.284(3)–2.455(3) Å. The distance of Ag1#8···Ag1#9 is 3.212(7) Å, smaller than twice the van der Waals radius of silver atoms (3.44 Å), indicating the existence of a Ag···Ag interaction . The CA ligand adopts (κ 1 O-κ 2 O)-(κ 1 O-κ 2 O)-κ 2 O-μ 8 bridging to link eight Ag (I) ions (Scheme c), which result in the complicated 3D framework (Figure S5a and 3b).…”

“…The distance of Ag1#8•••Ag1#9 is 3.212(7) Å, smaller than twice the van der Waals radius of silver atoms (3.44 Å), indicating the existence of a Ag•••Ag interaction. 34 The CA ligand adopts (κ 1 O-κ 2 O)-(κ 1 O-κ 2 O)κ 2 O-μ 8 bridging to link eight Ag (I) ions (Scheme 1c), which result in the complicated 3D framework (Figure S5a and 3b). It should be mentioned that there are three kinds of different channels in the framework: the largest channel openings are 14membered-ring openings with a window size of 5.70 × 8.27 Å 2 , the moderate channel openings are 10-membered-ring openings with a window size of 4.44 × 4.62 Å 2 , and the smallest channel openings are 8-membered-ring openings with a window size of 3.11 × 4.83 Å 2 (Figure S2).…”

Structural modulation and properties of silver(I) coordination polymers from 2,6-naphthalenedicarboxylic acid and flexible N-donor linkers

“…Recent research has shown that these MOCPs materials, acting as catalysts, are quite effective in the catalytic degradation of organic pollutants which is generally accomplished with an oxidizing agent such as dilute hydrogen peroxide [10][11][12][13]. These reports show that the choice of organic bridging Aromatic multicarboxylate ligands, such as 1,4-benzenedicarboxylic acid, 1,3,5-benzenetricarboxylic and 1,2,4,5-benzenetetracarboxylic acid, have been extensively utilized in the construction of coordination polymers because of their abundant coordination modes to satisfy the geometric requirements of metal centers leading to fascinating structural architectures [14][15][16]. Additionally, the presence of N-containing auxiliary ligands is also a rational and effective strategy for the fabrication of highly connected MOCPs.…”