Various Silver Phosphinate Inorganic Architectures in Three-Dimensional Frameworks with Argentophilic Interactions

Abstract

Three silver compounds with the formulas: [Ag2(HL1)] (1), [Ag10(L2)2(H2O)1.25] (2), and [Ag5(L3)]·1.5H2O (3) were obtained by self-assembly of silver nitrate with 4,4′-phosphinicobis-dibenzoic acid (H3L1), 4,4′-phosphinicobis-diisophthalic acid (H5L2), and 2,2′-phosphinicobis-diisophthalic acid (H5L3) under hydrothermal conditions. The structures of these compounds were confirmed by various characterization methods. Both 1 and 2 crystallize in P21/n space group and present three-dimensional (3D) frameworks, which contain a sliver phosphinate inorganic chain or sheet formed by Ag–Ag interactions. Meanwhile, compound 3 is in C2/c space group and also displays a 3D silver-organic architecture. The open-framework contains narrow channels along the c-axis with an opening of 0.26 nm × 0.32 nm. The intriguing feature of the structure is emergence of a 3D inorganic skeleton in 3, which struts the whole framework. The 3D inorganic skeleton is generated from a silver phosphinite chain connected by strong Ag–Ag interactions. At room temperature, the compounds exhibit blue photoluminescence.

Transition Metal Ions Regulated Structural and Catalytic Behaviors of Coordination Polymers

“…The Ag + ion has distorted tetrahedral geometry (AgO 2 N 2 ) connecting two oxygen atoms carboxylate group, one nitrogen atom of pyrazolate ligand, and one nitrogen atom of solvent moiety (Figure a and Figure S12). The respective bond lengths of Ag–O fall in the range 2.337(3)–2.481(3) Å, and Ag–N bond distances are in the range 2.237(5)–2.302(4) Å, closely matching with the earlier reported silver­(I)-based coordination compounds. ,− The various < O/N–Ag–O/N angles differ in the range 84.66(11)–133.69(17)° with an average of 109.03°, confirming the distorted tetrahedral geometry of the Ag ion. The important bond lengths and angles are supplied in Table S3.…”

Synthesizing Ag+: MgS, Ag+: Nb2S5, Sm3+: Y2S3, Sm3+:Er2S3, and Sm3+:ZrS2 Compound Nanoparticles for Multicolor Fluorescence Imaging of Biotissues

“…6 Lu et al reported the synthesis of three silver coordination polymers by coordinating three pyridine carboxylic hydrazide (4-pyridine carboxylic hydrazide, 3-pyridine carboxylic hydrazide, and 2-carboxylic hydrazide) with silver nanoclusters, which present green emission upon the excitation of UV light. 7 Ashenfelter et al synthesized molecular Ag-glutathione compounds of Ag 32 (SG) 19 , Ag 15 (SG) 11 , and Ag 11 (SG) 7 , which emit red light upon the excitation of blue light. 8 Xie et al made silver-organic gels (NH4) 9 [Ag 9 (mba) 9 ], which undergo the aggregation-induced emission of red light and fluorescence-to-phosphorescence switching.…”

“…He et al synthesized three kinds of silver phosphinate in three-dimensional frameworks with argentophilic interactions, which reveal a green emission upon blue light excitation. 11 Shu et al used Pb ions to modify Ag 2 S quantum dots for tuning its emission in the second nearinfrared window. 12 Samarium-based compounds have been another class of interesting fluorophores because of their orange/red light emission, 13−18 reports showing that Sm-based compounds can emit fluorescence other than orange/red light.…”

“…Silver is an attractive metal for optical investigation when considering the position of its d-electrons compared to gold. − Silver-based optical materials have been attracting significant attention from many chemists, biologists, and pharmacists during the last few decades. − This phenomenon is the result of the fact that these materials show particularly interesting visible and NIR emissions. Several examples are discussed as follows; Zheng and Dickson.…”

“…This material is highly fluorescent and its large Stokes shift can provide a strongly suppressed emission reabsorption. He et al synthesized three kinds of silver phosphinate in three-dimensional frameworks with argentophilic interactions, which reveal a green emission upon blue light excitation . Shu et al used Pb ions to modify Ag 2 S quantum dots for tuning its emission in the second near-infrared window …”