Poly[μ2-aqua-aqua-μ4-pyridine-2,4-dicarboxyl­ato-strontium]

Janet Soleimannejad; Yaghoub Mohammadzadeh; Hossein Aghabozorg; Zohreh Derikvand

doi:10.1107/S160053680902683X

. 2009 Jul 15;65(Pt 8):m922. doi: 10.1107/S160053680902683X

Poly[μ₂-aqua-aqua-μ₄-pyridine-2,4-dicarboxylato-strontium]

Janet Soleimannejad ^a,^*, Yaghoub Mohammadzadeh ^a, Hossein Aghabozorg ^b, Zohreh Derikvand ^c

PMCID: PMC2977487 PMID: 21583378

Abstract

In the title polymeric complex, [Sr(C₇H₃NO₄)(H₂O)₂]_n, the Sr^II atom is eight-coordinated by four O atoms and one N atom of four pyridine-2,4-dicarboxylate (py-2,4-dc) ligands and three O atoms of three coordinated water molecules in a dodecahedral geometry. These units are connected via the carboxylate O atoms and water molecules, building polymeric layers parallel to (100). In the crystal structure, non-covalent interactions consisting of O—H⋯O hydrogen bonds and π–π stacking interactions [centroid–centroid distances = 3.862 (17) and 3.749 (17) Å] connect the various components, forming a three-dimensional structure.

Related literature

For related structures, see: Aghabozorg, Manteghi & Sheshmani (2008 ▶); Aghabozorg, Nemati et al. (2008 ▶); Liang (2008 ▶); Soleimannejad et al. (2007 ▶).

Experimental

Crystal data

[Sr(C₇H₃NO₄)(H₂O)₂]
M _r = 288.76
Monoclinic,
a = 6.8860 (5) Å
b = 19.7801 (13) Å
c = 6.5642 (4) Å
β = 91.892 (5)°
V = 893.59 (10) Å³
Z = 4
Mo Kα radiation
μ = 6.04 mm⁻¹
T = 296 K
0.08 × 0.05 × 0.05 mm

Data collection

Bruker SMART 1000 diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T _min = 0.560, T _max = 0.752
6370 measured reflections
2321 independent reflections
1795 reflections with I > 2σ(I)
R _int = 0.042

Refinement

R[F ² > 2σ(F ²)] = 0.030
wR(F ²) = 0.070
S = 1.03
2321 reflections
136 parameters
H-atom parameters constrained
Δρ_max = 0.76 e Å⁻³
Δρ_min = −0.59 e Å⁻³

Data collection: SMART (Bruker, 1998 ▶); cell refinement: SAINT (Bruker, 1998 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: SHELXTL (Sheldrick, 2008 ▶); software used to prepare material for publication: SHELXTL.

Supplementary Material

Crystal structure: contains datablocks I, global. DOI: 10.1107/S160053680902683X/pv2167sup1.cif

e-65-0m922-sup1.cif^{(19.2KB, cif)}

Structure factors: contains datablocks I. DOI: 10.1107/S160053680902683X/pv2167Isup2.hkl

e-65-0m922-Isup2.hkl^{(114.1KB, hkl)}

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

Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O5—H5B⋯O4ⁱ	0.85	1.95	2.759 (3)	158
O5—H5A⋯O4ⁱⁱ	0.85	1.92	2.730 (3)	160
O5—H5A⋯O3ⁱⁱ	0.85	2.37	3.051 (3)	137
O6—H6B⋯O3ⁱⁱⁱ	0.85	2.12	2.958 (3)	169
O6—H6A⋯O4^iv	0.85	2.10	2.833 (3)	144

Open in a new tab

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

supplementary crystallographic information

Comment

We have previously reported two complexes of Sr^II with pyridine-3,5-dicarpoxylic and pyridine-2,6-dicarboxylic acid [Sr(C₇H₃NO₄)(H₂O)₄]_n (Aghabozorg et al., 2008; Aghabozorg, Manteghi et al., 2008) and (C₁₀H₁₀N₂)[Sr(C₇H₃NO₄)₂(H₂O)₃].3H₂O (Soleimannejad et al, 2007). The co-crystal of this acid has been published C₇H₅NO₄.C₃H₇NO₃ (Liang, 2008).

Here we repot on the crystal structure of the title polymeric complex which is a two-dimensional polymer (Fig. 1). The Sr–O distances are in the range of 2.511 (2)–2.688 (2) Å, and the bond angles and bond distances around Sr^II atom show that the coordination environment of Sr^II atom is distored dodecahedron.

The carboxylate groups from py-2,4-dc (where py = pyridine and dc = dicarboxylate) link four Sr^II centers by four O atoms (O1ⁱ, O1ⁱⁱ, O2 and O3), [symmetry cods: (i) x, y, 1 + z, (ii), x,1.5 - y, 1/2 + z.] and one N1 atom result in the formation of two-dimensional polymeric chain in the crystal structure. There are a number of O–H···O hydrogen bonds with distances ranging 2.759 (3) Å to 3.052 (3) Å (Table 1). In the crystal structure there are many pores that can be used for storage of gas and elimination of guest molecules. Noncovalent interactions consist of hydrogen bonding and π–π stacking interactions with centroied-centroied distances [3.862 (17) Å and 3.749 (17) Å] connect the various components to form a supramolecular structure (Fig. 2).

Experimental

An aqueous solution of 4,4'-bipyridine (100 mg, 2 mmol) and pyridine-2,4-dicarboxylic acid (53 mg, 1 mmol) was refluxed for an hour. A solution of Sr(NO₃)₂(134 mg, 0.5 mmol) in water (3 ml) was added to the solution and refluxed for an hour. Colorless crystals were obtained after one week by the slow evaporation of the solvent at room temperature.