catena-Poly[disilver(I)(Ag–Ag)-bis­(μ3-quinoline-3-carboxyl­ato)-1:2:1′κ3 O:O′:N;2:1′′:2′′κ3 N:O:O′]

Chun-Bo Liu; Yao Cong; He-Yi Sun

doi:10.1107/S1600536812035209

. 2012 Aug 15;68(Pt 9):m1177. doi: 10.1107/S1600536812035209

catena-Poly[disilver(I)(Ag–Ag)-bis(μ₃-quinoline-3-carboxylato)-1:2:1′κ³ O:O′:N;2:1′′:2′′κ³ N:O:O′]

Chun-Bo Liu ^a,^*, Yao Cong ^a, He-Yi Sun ^a

PMCID: PMC3435599 PMID: 22969472

Abstract

In the title compound, [Ag₂(C₁₀H₆NO₂)₂]_n, the Ag^I atom is coordinated by one N atom and two O atoms from three quinoline-3-carboxylate ligands in a T-shaped fashion, with an additional Ag⋯Ag distance of 2.9468 (6) Å. The ligands connect the Ag^I atoms into a double-chain structure along [010]. Weak Ag⋯O interactions [Ag⋯O = 2.802 (3) and 2.877 (4) Å] link the double-chains into a layer network parallel to (101). π–π interactions are also observed in the layer network [centroid–centroid distances = 3.780 (3) and 3.777 (3) Å].

Related literature

For background to the design and applications of structures with metal-organic frameworks and of Ag^I complexes, see: Sun et al. (2010 ▶); Wei et al. (2006 ▶); Yilmaz et al. (2008 ▶). For related structures, see: Baenziger et al. (1986 ▶); Yang et al. (2004 ▶); Yeşiilel et al. (2011 ▶); You et al. (2004 ▶).

Experimental

Crystal data

[Ag₂(C₁₀H₆NO₂)₂]
M _r = 560.06
Triclinic,
a = 8.0583 (15) Å
b = 8.4824 (15) Å
c = 12.934 (2) Å
α = 93.225 (2)°
β = 94.812 (2)°
γ = 104.640 (2)°
V = 849.6 (3) Å³
Z = 2
Mo Kα radiation
μ = 2.34 mm⁻¹
T = 293 K
0.13 × 0.11 × 0.10 mm

Data collection

Bruker APEX CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T _min = 0.745, T _max = 0.792
6197 measured reflections
2962 independent reflections
2298 reflections with I > 2σ(I)
R _int = 0.027

Refinement

R[F ² > 2σ(F ²)] = 0.030
wR(F ²) = 0.081
S = 1.01
2962 reflections
253 parameters
168 restraints
H-atom parameters constrained
Δρ_max = 0.51 e Å⁻³
Δρ_min = −0.52 e Å⁻³

Data collection: SMART (Bruker, 2007 ▶); cell refinement: SAINT (Bruker, 2007 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: XP in SHELXTL (Sheldrick, 2008 ▶) and DIAMOND (Brandenburg, 1999 ▶); software used to prepare material for publication: SHELXTL.

Supplementary Material

Crystal structure: contains datablock(s) global, I. DOI: 10.1107/S1600536812035209/hy2558sup1.cif

e-68-m1177-sup1.cif^{(17.8KB, cif)}

Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536812035209/hy2558Isup2.hkl

e-68-m1177-Isup2.hkl^{(142.4KB, hkl)}

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Table 1. Selected bond lengths (Å).

Ag1—N1	2.429 (3)
Ag1—O2ⁱ	2.219 (3)
Ag1—O4ⁱⁱ	2.220 (3)
Ag2—N2	2.373 (3)
Ag2—O1ⁱ	2.282 (3)
Ag2—O3ⁱⁱ	2.258 (3)

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Symmetry codes: (i) Inline graphic ; (ii) .

Acknowledgments

The authors thank Jiangsu University for supporting this research.

supplementary crystallographic information

Comment

In recent years, the design and synthesis of metal-organic frameworks (MOFs) based on assembly of suitable and rigid building blocks have attracted great attention for their interesting structures and potential applications in catalysis, separation, gas storage and molecular recognition (Wei et al., 2006). Moreover, Ag(I) ion is easy to form short Ag–Ag contacts as well as ligand unsupported interactions, which have been proved to be two of the most important factors contributing to the formation of such complexes and special properties (Yilmaz et al., 2008). Much attention has been paid to Ag(I) ion as its d¹⁰ closed-shell electronic configuration. It demonstrates a dynamic range of coordinative geometries, including linear, trigonal-planar, tetrahedral and trigonal-pyramidal. In occasional, it also has examples of square-planar, pyramidal and octahedral geometries, and a tendency to form an argentophilic interaction, both of which may lead to discovery of novel structural motifs (Sun et al., 2010). It is well known that quinoline-3-carboxylic acid (HL) acts as a polyfunctional ligand in metal complexes and coordinates to metals by means of its carboxylate oxygen and a nitrogen atom, exhibiting different coordination modes, such as monodentate-N and monodentate-O, bis(monodentate), bidentate(N, O) and bridging form. In addition, HL also displays an extend π-system, which is beneficial for the formation of π–π interactions to generate high dimensional supramolecular architectures and further stabilize the network. Therefore, we selected silver ion and HL to obtain the title compound under hydrothermal conditions.

In the title compound, the Ag^I is coordinated by one N atom and two O atoms from three L ligands (Fig. 1, Table 1) and also forms an Ag···Ag contact (Baenziger et al., 1986; Yang et al., 2004). The distance of Ag1···Ag2 is 2.9468 (6) Å. It is shorter than the sum of the van der Waals radii of two silver(I) atoms (3.44 Å), thus the Ag—Ag interaction is found (Yeşilel et al., 2011; You et al., 2004). The bidentate bridging carboxylate group of the ligand connect two Ag atoms and the pyridine N atom links another Ag atom, leading to the formation of a one-dimensional double-chain structure (Fig. 2). The weak Ag···O interactions, with Ag1···O2ⁱ and Ag2···O1ⁱⁱ distances of 2.802 (3) and 2.877 (4) Å [symmetry codes: (i) 2-x, -y, 1-z; (ii) 1-x, -y, 1-z], link the double-chains into a layer network. π–π interactions are observed in the layer network [centroid–centroid distances = 3.780 (3) and 3.777 (3) Å].

Experimental

HL was purchased commercially and used without further purification. A mixture of AgCl (14.33 mg, 0.1 mmol) and HL (17.30 mg, 0.1 mmol) was dissolved in a 10 ml of water with pH = 6. The resulting mixture was heated in a 15 ml Teflon-lined autoclave at 438 K for three days. Then the autoclave was slowly cooled to room temperature and colourless block-shaped crystals were obtained in a yield of 50%.