Poly[tetra­kis­(μ-benzene-1,2-dicarboxyl­ato)di-μ-formato-penta­strontium(II)]

Pei-Chi Cheng; Jun-Xiang Zhan; Cheng-You Wu; Chia-Her Lin

doi:10.1107/S1600536811044977

. 2011 Nov 2;67(Pt 12):m1647. doi: 10.1107/S1600536811044977

Poly[tetrakis(μ-benzene-1,2-dicarboxylato)di-μ-formato-pentastrontium(II)]

Pei-Chi Cheng ^a, Jun-Xiang Zhan ^b, Cheng-You Wu ^b, Chia-Her Lin ^b,^*

PMCID: PMC3238585 PMID: 22199476

Abstract

The asymmetric unit of the title complex, [Sr₅(C₈H₄O₄)₄(HCO₂)₂]_n, contains three independent Sr^II ions, one of which is located on an inversion center. In the crystal, the Sr^II ions (coordination numbers 8, 9 and 12) are connected by two crystallographically distinct benzene-1,2-dicarboxylate ligands and one formate ligand, forming a two-dimensional polymer parallel to (001).

Related literature

For general background to metal coordination polymers, see: Kitagawa et al. (2004 ▶). For related structures, see: Stein & Ruschewitz (2005 ▶); Zhang et al. (2009 ▶); Wang et al. (2010 ▶).

Experimental

Crystal data

[Sr₅(C₈H₄O₄)₄(HCO₂)₂]
M _r = 1184.58
Triclinic,
a = 7.0292 (3) Å
b = 10.2892 (4) Å
c = 12.5439 (5) Å
α = 91.361 (2)°
β = 90.407 (2)°
γ = 104.998 (2)°
V = 876.00 (6) Å³
Z = 1
Mo Kα radiation
μ = 7.65 mm⁻¹
T = 295 K
0.20 × 0.18 × 0.15 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2010 ▶) T _min = 0.310, T _max = 0.393
15465 measured reflections
4295 independent reflections
3585 reflections with I > 2σ(I)
R _int = 0.033

Refinement

R[F ² > 2σ(F ²)] = 0.028
wR(F ²) = 0.060
S = 1.04
4295 reflections
268 parameters
H-atom parameters constrained
Δρ_max = 0.97 e Å⁻³
Δρ_min = −0.39 e Å⁻³

Data collection: APEX2 (Bruker, 2010 ▶); cell refinement: SAINT (Bruker, 2010 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: DIAMOND (Brandenburg, 2010 ▶); software used to prepare material for publication: SHELXTL (Sheldrick, 2008 ▶).

Supplementary Material

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536811044977/lh5360sup1.cif

e-67-m1647-sup1.cif^{(26.4KB, cif)}

Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811044977/lh5360Isup2.hkl

e-67-m1647-Isup2.hkl^{(210.4KB, hkl)}

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

Acknowledgments

This research was supported by National Science Council, Taiwan (NSC99–2113-M-033–005-MY2) and by the Center-of-Excellence (COE) Program on Membrane Technology of the Ministry of Education (MOE).

supplementary crystallographic information

Comment

The increasingly rapid development of metal coordination polymers over the past two decades has attracted considerable attention due to their structural diversity and important applications (Kitagawa et al., 2004). benzene-1,2-dicarboxylate acid (H₂BDC) has been successively applied to construct to strontium (Stein & Ruschewitz, 2005), lead (Zhang et al., 2009), and tin complexes (Wang et al., 2010). Here we report the crystal structure of the title complex.

The title compound contains three crystallographically independent Sr^II ions, with coordination numbers 12 (Sr1, located on an inversion center), 8 (Sr2) and 9 (Sr3). The Sr—O distances range from 2.467 (2) to 2.9332 (19) Å. The coordination geometry of the Sr(II) ions is shown in Fig. 1. In the crystal, the Sr^II ions are connected by two crystallographically distinct benzene-1,2-dicarboxylate ligands and one formate ligand, to form a two-dimensional polymer parallel to (001) [Fig. 2].

Experimental

Solvothermal reactions were carried out at 423 K for 2 d in a Teflon-lined acid digestion bomb with an internal volume of 23 ml followed by slow cooling at 6 K/h to room temperature. A single-phase product consisting of transparent colorless crystals of was obtained from a mixture of Sr(NO₃)₂ (0.0847 g,0.4 mmol), H₂ortho-BDC (0.0332 g, 0.2 mmol), DMF (5.0 ml) and H₂O (1.0 ml).