metal-organic compounds
catena-Poly[[diaquastrontium(II)]-bis[μ-2-(3-benzoylphenyl)propanoato]]
aSchool of Pharmaceutical Science, Harbin Medical University, Harbin 150081, People's Republic of China
*Correspondence e-mail: zhangzhuyan1971@163.com
In the title coordination polymer, [Sr(C16H13O3)2(H2O)2]n, the SrII cation is eight-coordinated by six O atoms from four different 2-(3-benzoylphenyl)propanoate ligands and two O atoms of two water molecules in a distorted dodecahedral geometry. Adjacent SrII cations are bridged by two 2-(3-benzoylphenyl)propanoate ligands, forming an infinite chain along the b axis; the chains are further linked by intermolecular O—H—O hydrogen bonds into a three-dimensional supramolecular network.
Related literature
For the crystal structures of metal complexes of the 2-(3-benzoylphenyl)propanoate anion, see: Tahir et al. (1997); Zhang et al. (2007a,b).
Experimental
Crystal data
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Refinement
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Data collection: RAPID-AUTO (Rigaku, 1998); cell RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPII (Johnson, 1976); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S160053681003429X/ng5018sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681003429X/ng5018Isup2.hkl
The title complex was prepared by the addition of strontium nitrate (2.12 g, 10 mmol) to a hot aqueous solution of 2-(3-benzoylphenyl)propanoic acid (3.65 g, 10 mmol); the pH was adjusted to 6 with 0.1M sodium hydroxide. The solution was allowed to evaporate at room temperature. Colorless prismatic crystals separated from the filtered solution after several days. CH&N analysis. Calc. for C32H30SrO8: C 60.93, H 4.76%. Found: C 60.96, H 4.83%.
The H atoms were placed in calculated positions [C—H = 0.93 and 0.98 Å and Uiso(H) = 1.2Ueq (C) for aromatic H atoms and methyne H atoms, C—H = 0.96 Å and Uiso(H) = 1.5Ueq (C) for methyl H atoms] and were included in the
in the riding-model approximation. The H atoms of water molecules were located in difference Fourier maps and refined with the O—H distance restrained to 0.85 (1) Å and Uiso(H) = 1.5Ueq(O).Data collection: RAPID-AUTO (Rigaku, 1998); cell
RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPII (Johnson, 1976); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. Molecular structure of the title polymer with 30% probability ellipsoid for the non-H atoms. | |
Fig. 2. 1-D chain structure of the title polymer (the C atoms are omitted for clarity). |
[Sr(C16H13O3)2(H2O)2] | F(000) = 1296 |
Mr = 630.18 | Dx = 1.442 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 11966 reflections |
a = 18.665 (4) Å | θ = 3.1–25.0° |
b = 8.0406 (16) Å | µ = 1.91 mm−1 |
c = 19.377 (4) Å | T = 295 K |
β = 93.26 (3)° | Prism, colorless |
V = 2903.4 (10) Å3 | 0.30 × 0.25 × 0.18 mm |
Z = 4 |
Rigaku R-AXIS RAPID diffractometer | 5107 independent reflections |
Radiation source: fine-focus sealed tube | 2941 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.087 |
Detector resolution: 10.000 pixels mm-1 | θmax = 25.0°, θmin = 3.1° |
ω scans | h = −22→22 |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | k = −9→9 |
Tmin = 0.598, Tmax = 0.725 | l = −23→19 |
22141 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.050 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.136 | w = 1/[σ2(Fo2) + (0.0533P)2 + 1.5847P] where P = (Fo2 + 2Fc2)/3 |
S = 1.08 | (Δ/σ)max < 0.001 |
5107 reflections | Δρmax = 0.69 e Å−3 |
385 parameters | Δρmin = −0.96 e Å−3 |
7 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0013 (4) |
[Sr(C16H13O3)2(H2O)2] | V = 2903.4 (10) Å3 |
Mr = 630.18 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 18.665 (4) Å | µ = 1.91 mm−1 |
b = 8.0406 (16) Å | T = 295 K |
c = 19.377 (4) Å | 0.30 × 0.25 × 0.18 mm |
β = 93.26 (3)° |
Rigaku R-AXIS RAPID diffractometer | 5107 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 2941 reflections with I > 2σ(I) |
Tmin = 0.598, Tmax = 0.725 | Rint = 0.087 |
22141 measured reflections |
R[F2 > 2σ(F2)] = 0.050 | 7 restraints |
wR(F2) = 0.136 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.08 | Δρmax = 0.69 e Å−3 |
5107 reflections | Δρmin = −0.96 e Å−3 |
385 parameters |
x | y | z | Uiso*/Ueq | ||
Sr1 | 0.48764 (2) | 0.75146 (5) | 0.52610 (2) | 0.04083 (19) | |
O1W | 0.3724 (2) | 0.6001 (5) | 0.5485 (3) | 0.0869 (15) | |
H1W1 | 0.345 (3) | 0.620 (7) | 0.581 (3) | 0.130* | |
H1W2 | 0.373 (4) | 0.496 (2) | 0.541 (3) | 0.130* | |
O1 | 0.58168 (18) | 0.9811 (4) | 0.46912 (17) | 0.0504 (9) | |
O2W | 0.5312 (2) | 0.8995 (4) | 0.6376 (2) | 0.0639 (11) | |
H2W1 | 0.563 (2) | 0.862 (6) | 0.667 (2) | 0.096* | |
H2W2 | 0.538 (3) | 1.0040 (18) | 0.634 (3) | 0.096* | |
O2 | 0.61427 (19) | 0.7219 (4) | 0.4837 (2) | 0.0614 (10) | |
O3 | 0.5860 (3) | 0.6644 (6) | 0.1710 (3) | 0.121 (2) | |
O4 | 0.4452 (2) | 0.7775 (4) | 0.39694 (18) | 0.0623 (11) | |
O5 | 0.47219 (19) | 0.5182 (4) | 0.42097 (18) | 0.0556 (10) | |
O6 | 0.2021 (3) | 0.3645 (6) | 0.4167 (3) | 0.1007 (16) | |
C1 | 0.6216 (3) | 0.8618 (6) | 0.4568 (3) | 0.0490 (13) | |
C2 | 0.6843 (4) | 0.8805 (7) | 0.4118 (4) | 0.099 (3) | |
H2 | 0.7251 | 0.8715 | 0.4457 | 0.119* | |
C3 | 0.6965 (5) | 1.0412 (7) | 0.3813 (4) | 0.123 (3) | |
H3A | 0.7422 | 1.0413 | 0.3610 | 0.184* | |
H3B | 0.6960 | 1.1254 | 0.4164 | 0.184* | |
H3C | 0.6593 | 1.0636 | 0.3463 | 0.184* | |
C4 | 0.6951 (4) | 0.7317 (8) | 0.3669 (4) | 0.076 (2) | |
C5 | 0.7489 (4) | 0.6203 (8) | 0.3800 (4) | 0.078 (2) | |
H5 | 0.7810 | 0.6373 | 0.4178 | 0.094* | |
C6 | 0.7570 (4) | 0.4815 (7) | 0.3384 (4) | 0.0743 (19) | |
H6 | 0.7945 | 0.4080 | 0.3490 | 0.089* | |
C7 | 0.7110 (4) | 0.4507 (7) | 0.2822 (3) | 0.0685 (17) | |
H7 | 0.7164 | 0.3562 | 0.2553 | 0.082* | |
C8 | 0.6564 (4) | 0.5628 (7) | 0.2661 (4) | 0.0669 (17) | |
C9 | 0.6493 (4) | 0.7039 (7) | 0.3090 (4) | 0.076 (2) | |
H9 | 0.6129 | 0.7801 | 0.2981 | 0.092* | |
C10 | 0.6085 (4) | 0.5418 (8) | 0.2023 (4) | 0.077 (2) | |
C11 | 0.5888 (3) | 0.3725 (8) | 0.1769 (4) | 0.0702 (17) | |
C12 | 0.5806 (4) | 0.3459 (10) | 0.1070 (5) | 0.095 (2) | |
H12 | 0.5883 | 0.4329 | 0.0767 | 0.114* | |
C13 | 0.5614 (5) | 0.1937 (13) | 0.0815 (5) | 0.114 (3) | |
H13 | 0.5582 | 0.1760 | 0.0340 | 0.137* | |
C14 | 0.5467 (4) | 0.0669 (11) | 0.1253 (6) | 0.110 (3) | |
H14 | 0.5320 | −0.0357 | 0.1075 | 0.133* | |
C15 | 0.5536 (4) | 0.0905 (10) | 0.1952 (5) | 0.098 (2) | |
H15 | 0.5436 | 0.0043 | 0.2251 | 0.117* | |
C16 | 0.5757 (4) | 0.2436 (8) | 0.2210 (4) | 0.0779 (18) | |
H16 | 0.5818 | 0.2594 | 0.2686 | 0.093* | |
C17 | 0.4514 (3) | 0.6286 (6) | 0.3793 (3) | 0.0474 (13) | |
C18 | 0.4340 (3) | 0.5796 (6) | 0.3037 (3) | 0.0538 (14) | |
H18 | 0.4791 | 0.5412 | 0.2855 | 0.065* | |
C19 | 0.4084 (4) | 0.7250 (7) | 0.2587 (3) | 0.084 (2) | |
H19A | 0.4005 | 0.6884 | 0.2118 | 0.126* | |
H19B | 0.4440 | 0.8112 | 0.2611 | 0.126* | |
H19C | 0.3643 | 0.7674 | 0.2750 | 0.126* | |
C20 | 0.3822 (3) | 0.4346 (6) | 0.2974 (3) | 0.0484 (13) | |
C21 | 0.3833 (3) | 0.3290 (7) | 0.2406 (3) | 0.0553 (14) | |
H21 | 0.4158 | 0.3494 | 0.2070 | 0.066* | |
C22 | 0.3376 (3) | 0.1952 (7) | 0.2326 (3) | 0.0620 (16) | |
H22 | 0.3391 | 0.1272 | 0.1939 | 0.074* | |
C23 | 0.2894 (3) | 0.1624 (7) | 0.2824 (3) | 0.0607 (15) | |
H23 | 0.2602 | 0.0689 | 0.2784 | 0.073* | |
C24 | 0.2845 (3) | 0.2682 (6) | 0.3384 (3) | 0.0547 (14) | |
C25 | 0.3314 (3) | 0.4039 (6) | 0.3452 (3) | 0.0535 (14) | |
H25 | 0.3284 | 0.4751 | 0.3827 | 0.064* | |
C26 | 0.2298 (3) | 0.2443 (7) | 0.3910 (3) | 0.0646 (15) | |
C27 | 0.2095 (3) | 0.0740 (7) | 0.4110 (3) | 0.0587 (15) | |
C28 | 0.2581 (4) | −0.0550 (7) | 0.4146 (3) | 0.0701 (17) | |
H28 | 0.3045 | −0.0382 | 0.4010 | 0.084* | |
C29 | 0.2382 (5) | −0.2089 (8) | 0.4383 (4) | 0.089 (2) | |
H29 | 0.2718 | −0.2943 | 0.4417 | 0.107* | |
C30 | 0.1708 (6) | −0.2376 (10) | 0.4565 (4) | 0.104 (3) | |
H30 | 0.1580 | −0.3428 | 0.4715 | 0.125* | |
C31 | 0.1211 (4) | −0.1121 (11) | 0.4530 (4) | 0.096 (2) | |
H31 | 0.0746 | −0.1325 | 0.4657 | 0.115* | |
C32 | 0.1397 (3) | 0.0456 (8) | 0.4305 (3) | 0.0731 (18) | |
H32 | 0.1061 | 0.1311 | 0.4286 | 0.088* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Sr1 | 0.0499 (3) | 0.0273 (3) | 0.0458 (3) | 0.0009 (2) | 0.0062 (2) | 0.0017 (2) |
O1W | 0.069 (3) | 0.039 (2) | 0.158 (5) | −0.001 (2) | 0.052 (3) | 0.004 (3) |
O1 | 0.054 (2) | 0.0337 (19) | 0.064 (2) | 0.0082 (17) | 0.0082 (18) | 0.0007 (17) |
O2W | 0.095 (3) | 0.042 (2) | 0.053 (3) | 0.003 (2) | −0.017 (2) | 0.0068 (18) |
O2 | 0.064 (2) | 0.035 (2) | 0.089 (3) | 0.0039 (17) | 0.029 (2) | 0.0076 (18) |
O3 | 0.170 (6) | 0.065 (3) | 0.127 (5) | 0.017 (3) | −0.008 (4) | 0.032 (3) |
O4 | 0.097 (3) | 0.035 (2) | 0.053 (2) | 0.0004 (19) | −0.015 (2) | 0.0016 (16) |
O5 | 0.076 (3) | 0.0331 (19) | 0.057 (2) | 0.0020 (18) | −0.0084 (19) | 0.0084 (17) |
O6 | 0.103 (4) | 0.059 (3) | 0.145 (5) | 0.002 (3) | 0.047 (3) | −0.016 (3) |
C1 | 0.055 (3) | 0.035 (3) | 0.058 (4) | −0.004 (3) | 0.009 (3) | −0.006 (3) |
C2 | 0.132 (6) | 0.045 (4) | 0.130 (6) | −0.018 (4) | 0.091 (5) | −0.021 (4) |
C3 | 0.195 (9) | 0.053 (4) | 0.131 (7) | −0.034 (5) | 0.100 (6) | −0.019 (4) |
C4 | 0.086 (5) | 0.050 (4) | 0.096 (5) | −0.023 (4) | 0.052 (4) | −0.013 (4) |
C5 | 0.076 (4) | 0.060 (4) | 0.103 (5) | −0.009 (4) | 0.043 (4) | −0.014 (4) |
C6 | 0.071 (4) | 0.048 (4) | 0.106 (6) | −0.002 (3) | 0.030 (4) | −0.011 (4) |
C7 | 0.081 (5) | 0.051 (4) | 0.076 (5) | 0.001 (3) | 0.033 (4) | −0.009 (3) |
C8 | 0.077 (4) | 0.043 (3) | 0.083 (5) | 0.001 (3) | 0.027 (4) | 0.010 (3) |
C9 | 0.085 (5) | 0.036 (3) | 0.114 (6) | 0.008 (3) | 0.056 (5) | 0.015 (3) |
C10 | 0.090 (5) | 0.047 (4) | 0.099 (6) | 0.011 (4) | 0.037 (4) | 0.019 (4) |
C11 | 0.072 (4) | 0.063 (4) | 0.076 (5) | 0.009 (3) | 0.012 (4) | 0.016 (4) |
C12 | 0.095 (6) | 0.081 (6) | 0.108 (7) | 0.006 (4) | 0.006 (5) | 0.012 (5) |
C13 | 0.121 (7) | 0.108 (7) | 0.111 (7) | 0.015 (6) | −0.008 (6) | −0.002 (6) |
C14 | 0.100 (6) | 0.079 (6) | 0.149 (9) | 0.006 (5) | −0.030 (6) | −0.016 (6) |
C15 | 0.087 (5) | 0.070 (5) | 0.135 (8) | −0.002 (4) | −0.003 (5) | 0.020 (5) |
C16 | 0.082 (4) | 0.059 (4) | 0.095 (5) | 0.005 (4) | 0.019 (4) | 0.016 (4) |
C17 | 0.054 (3) | 0.036 (3) | 0.051 (3) | −0.009 (3) | −0.003 (3) | 0.002 (3) |
C18 | 0.066 (4) | 0.046 (3) | 0.048 (3) | −0.010 (3) | −0.006 (3) | 0.001 (2) |
C19 | 0.121 (6) | 0.066 (4) | 0.062 (4) | −0.029 (4) | −0.026 (4) | 0.021 (3) |
C20 | 0.058 (3) | 0.040 (3) | 0.046 (3) | 0.003 (3) | −0.006 (3) | 0.003 (2) |
C21 | 0.072 (4) | 0.048 (3) | 0.045 (3) | 0.002 (3) | −0.007 (3) | 0.003 (3) |
C22 | 0.077 (4) | 0.047 (3) | 0.060 (4) | 0.002 (3) | −0.008 (3) | −0.009 (3) |
C23 | 0.069 (4) | 0.043 (3) | 0.068 (4) | −0.004 (3) | −0.009 (3) | −0.008 (3) |
C24 | 0.056 (3) | 0.047 (3) | 0.060 (3) | −0.002 (3) | −0.002 (3) | −0.002 (3) |
C25 | 0.060 (4) | 0.041 (3) | 0.059 (4) | 0.003 (3) | −0.009 (3) | −0.005 (3) |
C26 | 0.065 (4) | 0.049 (3) | 0.078 (4) | −0.004 (3) | 0.000 (3) | −0.009 (3) |
C27 | 0.062 (4) | 0.057 (4) | 0.056 (4) | −0.004 (3) | −0.003 (3) | −0.006 (3) |
C28 | 0.082 (5) | 0.057 (4) | 0.070 (4) | 0.006 (4) | 0.001 (3) | −0.002 (3) |
C29 | 0.134 (7) | 0.062 (5) | 0.073 (5) | 0.009 (5) | 0.007 (5) | −0.002 (3) |
C30 | 0.173 (9) | 0.061 (5) | 0.082 (5) | −0.023 (6) | 0.028 (6) | −0.002 (4) |
C31 | 0.106 (6) | 0.100 (6) | 0.085 (5) | −0.038 (5) | 0.026 (5) | −0.014 (5) |
C32 | 0.076 (5) | 0.074 (4) | 0.070 (4) | −0.008 (4) | 0.008 (4) | −0.013 (3) |
Sr1—O5i | 2.496 (3) | C11—C12 | 1.370 (9) |
Sr1—O1ii | 2.514 (3) | C11—C16 | 1.375 (8) |
Sr1—O1W | 2.529 (4) | C12—C13 | 1.361 (11) |
Sr1—O2 | 2.557 (4) | C12—H12 | 0.9300 |
Sr1—O2W | 2.559 (4) | C13—C14 | 1.363 (11) |
Sr1—O4 | 2.590 (4) | C13—H13 | 0.9300 |
Sr1—O5 | 2.772 (3) | C14—C15 | 1.367 (11) |
Sr1—O1 | 2.816 (3) | C14—H14 | 0.9300 |
Sr1—C1 | 3.037 (5) | C15—C16 | 1.383 (9) |
Sr1—C17 | 3.050 (5) | C15—H15 | 0.9300 |
O1W—H1W1 | 0.85 (6) | C16—H16 | 0.9300 |
O1W—H1W2 | 0.852 (10) | C17—C18 | 1.535 (7) |
O1—C1 | 1.246 (5) | C18—C19 | 1.519 (7) |
O1—Sr1ii | 2.514 (3) | C18—C20 | 1.515 (7) |
O2W—H2W1 | 0.85 (4) | C18—H18 | 0.9800 |
O2W—H2W2 | 0.852 (10) | C19—H19A | 0.9600 |
O2—C1 | 1.251 (6) | C19—H19B | 0.9600 |
O3—C10 | 1.220 (7) | C19—H19C | 0.9600 |
O4—C17 | 1.252 (6) | C20—C25 | 1.384 (7) |
O5—C17 | 1.246 (5) | C20—C21 | 1.392 (7) |
O5—Sr1i | 2.496 (3) | C21—C22 | 1.377 (7) |
O6—C26 | 1.217 (6) | C21—H21 | 0.9300 |
C1—C2 | 1.505 (7) | C22—C23 | 1.381 (8) |
C2—C3 | 1.445 (6) | C22—H22 | 0.9300 |
C2—C4 | 1.500 (8) | C23—C24 | 1.386 (7) |
C2—H2 | 0.9800 | C23—H23 | 0.9300 |
C3—H3A | 0.9600 | C24—C25 | 1.400 (7) |
C3—H3B | 0.9600 | C24—C26 | 1.494 (8) |
C3—H3C | 0.9600 | C25—H25 | 0.9300 |
C4—C5 | 1.358 (9) | C26—C27 | 1.479 (8) |
C4—C9 | 1.389 (10) | C27—C28 | 1.378 (8) |
C5—C6 | 1.389 (8) | C27—C32 | 1.395 (8) |
C5—H5 | 0.9300 | C28—C29 | 1.378 (8) |
C6—C7 | 1.372 (8) | C28—H28 | 0.9300 |
C6—H6 | 0.9300 | C29—C30 | 1.345 (11) |
C7—C8 | 1.382 (8) | C29—H29 | 0.9300 |
C7—H7 | 0.9300 | C30—C31 | 1.369 (10) |
C8—C9 | 1.417 (8) | C30—H30 | 0.9300 |
C8—C10 | 1.494 (9) | C31—C32 | 1.391 (9) |
C9—H9 | 0.9300 | C31—H31 | 0.9300 |
C10—C11 | 1.487 (9) | C32—H32 | 0.9300 |
O5i—Sr1—O1ii | 150.60 (11) | H3B—C3—H3C | 109.5 |
O5i—Sr1—O1W | 75.52 (13) | C5—C4—C9 | 117.3 (6) |
O1ii—Sr1—O1W | 87.76 (11) | C5—C4—C2 | 122.7 (8) |
O5i—Sr1—O2 | 77.86 (11) | C9—C4—C2 | 120.0 (7) |
O1ii—Sr1—O2 | 125.34 (10) | C4—C5—C6 | 121.7 (7) |
O1W—Sr1—O2 | 145.14 (12) | C4—C5—H5 | 119.1 |
O5i—Sr1—O2W | 89.06 (11) | C6—C5—H5 | 119.1 |
O1ii—Sr1—O2W | 73.17 (12) | C7—C6—C5 | 121.4 (6) |
O1W—Sr1—O2W | 108.15 (16) | C7—C6—H6 | 119.3 |
O2—Sr1—O2W | 93.41 (14) | C5—C6—H6 | 119.3 |
O5i—Sr1—O4 | 122.37 (11) | C6—C7—C8 | 118.8 (6) |
O1ii—Sr1—O4 | 80.61 (11) | C6—C7—H7 | 120.6 |
O1W—Sr1—O4 | 89.33 (16) | C8—C7—H7 | 120.6 |
O2—Sr1—O4 | 86.23 (13) | C7—C8—C9 | 118.9 (7) |
O2W—Sr1—O4 | 147.50 (11) | C7—C8—C10 | 120.7 (6) |
O5i—Sr1—O5 | 74.36 (12) | C9—C8—C10 | 120.3 (6) |
O1ii—Sr1—O5 | 125.00 (11) | C4—C9—C8 | 121.9 (7) |
O1W—Sr1—O5 | 75.31 (14) | C4—C9—H9 | 119.1 |
O2—Sr1—O5 | 76.14 (12) | C8—C9—H9 | 119.1 |
O2W—Sr1—O5 | 161.83 (11) | O3—C10—C11 | 120.2 (7) |
O4—Sr1—O5 | 48.03 (10) | O3—C10—C8 | 119.5 (6) |
O5i—Sr1—O1 | 123.47 (11) | C11—C10—C8 | 120.3 (6) |
O1ii—Sr1—O1 | 77.71 (11) | C12—C11—C16 | 118.9 (7) |
O1W—Sr1—O1 | 159.64 (14) | C12—C11—C10 | 118.8 (6) |
O2—Sr1—O1 | 47.69 (10) | C16—C11—C10 | 122.2 (7) |
O2W—Sr1—O1 | 81.43 (12) | C13—C12—C11 | 120.7 (8) |
O4—Sr1—O1 | 74.41 (11) | C13—C12—H12 | 119.6 |
O5—Sr1—O1 | 101.34 (10) | C11—C12—H12 | 119.6 |
O5i—Sr1—C1 | 101.54 (13) | C12—C13—C14 | 120.3 (9) |
O1ii—Sr1—C1 | 101.82 (13) | C12—C13—H13 | 119.8 |
O1W—Sr1—C1 | 160.99 (16) | C14—C13—H13 | 119.8 |
O2—Sr1—C1 | 23.92 (11) | C13—C14—C15 | 120.1 (9) |
O2W—Sr1—C1 | 90.44 (14) | C13—C14—H14 | 119.9 |
O4—Sr1—C1 | 76.29 (14) | C15—C14—H14 | 119.9 |
O5—Sr1—C1 | 85.78 (12) | C14—C15—C16 | 119.5 (8) |
O1—Sr1—C1 | 24.20 (10) | C14—C15—H15 | 120.3 |
O5i—Sr1—C17 | 98.46 (13) | C16—C15—H15 | 120.3 |
O1ii—Sr1—C17 | 102.95 (13) | C11—C16—C15 | 120.4 (8) |
O1W—Sr1—C17 | 81.86 (16) | C11—C16—H16 | 119.8 |
O2—Sr1—C17 | 80.23 (13) | C15—C16—H16 | 119.8 |
O2W—Sr1—C17 | 168.83 (13) | O5—C17—O4 | 122.3 (5) |
O4—Sr1—C17 | 23.91 (11) | O5—C17—C18 | 118.5 (5) |
O5—Sr1—C17 | 24.12 (11) | O4—C17—C18 | 119.2 (4) |
O1—Sr1—C17 | 87.53 (12) | O5—C17—Sr1 | 65.3 (3) |
C1—Sr1—C17 | 80.01 (13) | O4—C17—Sr1 | 57.0 (3) |
O5i—Sr1—Sr1ii | 154.28 (8) | C18—C17—Sr1 | 175.9 (3) |
O1ii—Sr1—Sr1ii | 41.47 (7) | C19—C18—C20 | 111.6 (4) |
O1W—Sr1—Sr1ii | 127.72 (10) | C19—C18—C17 | 113.1 (5) |
O2—Sr1—Sr1ii | 83.90 (7) | C20—C18—C17 | 111.9 (4) |
O2W—Sr1—Sr1ii | 73.97 (8) | C19—C18—H18 | 106.6 |
O4—Sr1—Sr1ii | 73.69 (7) | C20—C18—H18 | 106.6 |
O5—Sr1—Sr1ii | 118.70 (7) | C17—C18—H18 | 106.6 |
O1—Sr1—Sr1ii | 36.24 (7) | C18—C19—H19A | 109.5 |
C1—Sr1—Sr1ii | 60.37 (10) | C18—C19—H19B | 109.5 |
C17—Sr1—Sr1ii | 96.11 (10) | H19A—C19—H19B | 109.5 |
O5i—Sr1—Sr1i | 39.46 (8) | C18—C19—H19C | 109.5 |
O1ii—Sr1—Sr1i | 153.66 (8) | H19A—C19—H19C | 109.5 |
O1W—Sr1—Sr1i | 71.59 (9) | H19B—C19—H19C | 109.5 |
O2—Sr1—Sr1i | 73.55 (7) | C25—C20—C21 | 117.4 (5) |
O2W—Sr1—Sr1i | 128.12 (8) | C25—C20—C18 | 122.9 (5) |
O4—Sr1—Sr1i | 82.92 (7) | C21—C20—C18 | 119.7 (5) |
O5—Sr1—Sr1i | 34.90 (7) | C22—C21—C20 | 122.0 (5) |
O1—Sr1—Sr1i | 117.22 (7) | C22—C21—H21 | 119.0 |
C1—Sr1—Sr1i | 94.03 (10) | C20—C21—H21 | 119.0 |
C17—Sr1—Sr1i | 59.01 (10) | C21—C22—C23 | 119.6 (5) |
Sr1ii—Sr1—Sr1i | 148.45 (2) | C21—C22—H22 | 120.2 |
Sr1—O1W—H1W1 | 126 (5) | C23—C22—H22 | 120.2 |
Sr1—O1W—H1W2 | 115 (4) | C22—C23—C24 | 120.4 (5) |
H1W1—O1W—H1W2 | 109 (6) | C22—C23—H23 | 119.8 |
C1—O1—Sr1ii | 168.6 (3) | C24—C23—H23 | 119.8 |
C1—O1—Sr1 | 87.9 (3) | C23—C24—C25 | 118.8 (5) |
Sr1ii—O1—Sr1 | 102.29 (11) | C23—C24—C26 | 122.2 (5) |
Sr1—O2W—H2W1 | 125 (4) | C25—C24—C26 | 118.9 (5) |
Sr1—O2W—H2W2 | 115 (4) | C20—C25—C24 | 121.7 (5) |
H2W1—O2W—H2W2 | 108 (5) | C20—C25—H25 | 119.1 |
C1—O2—Sr1 | 100.1 (3) | C24—C25—H25 | 119.1 |
C17—O4—Sr1 | 99.1 (3) | O6—C26—C27 | 120.4 (6) |
C17—O5—Sr1i | 163.7 (3) | O6—C26—C24 | 120.0 (5) |
C17—O5—Sr1 | 90.5 (3) | C27—C26—C24 | 119.6 (5) |
Sr1i—O5—Sr1 | 105.64 (12) | C28—C27—C32 | 119.0 (6) |
O1—C1—O2 | 122.1 (5) | C28—C27—C26 | 122.1 (6) |
O1—C1—C2 | 121.8 (5) | C32—C27—C26 | 118.7 (6) |
O2—C1—C2 | 116.0 (5) | C29—C28—C27 | 120.2 (7) |
O1—C1—Sr1 | 67.9 (3) | C29—C28—H28 | 119.9 |
O2—C1—Sr1 | 56.0 (3) | C27—C28—H28 | 119.9 |
C2—C1—Sr1 | 166.3 (4) | C30—C29—C28 | 121.0 (8) |
C3—C2—C4 | 116.5 (6) | C30—C29—H29 | 119.5 |
C3—C2—C1 | 118.2 (5) | C28—C29—H29 | 119.5 |
C4—C2—C1 | 113.0 (5) | C29—C30—C31 | 120.1 (7) |
C3—C2—H2 | 101.8 | C29—C30—H30 | 120.0 |
C4—C2—H2 | 101.8 | C31—C30—H30 | 120.0 |
C1—C2—H2 | 101.8 | C30—C31—C32 | 120.5 (7) |
C2—C3—H3A | 109.5 | C30—C31—H31 | 119.8 |
C2—C3—H3B | 109.5 | C32—C31—H31 | 119.8 |
H3A—C3—H3B | 109.5 | C31—C32—C27 | 119.2 (6) |
C2—C3—H3C | 109.5 | C31—C32—H32 | 120.4 |
H3A—C3—H3C | 109.5 | C27—C32—H32 | 120.4 |
O5i—Sr1—O1—C1 | 27.6 (3) | O1—C1—C2—C3 | −1.5 (10) |
O1ii—Sr1—O1—C1 | −174.7 (3) | O2—C1—C2—C3 | −178.0 (7) |
O1W—Sr1—O1—C1 | −129.3 (4) | Sr1—C1—C2—C3 | 131.0 (16) |
O2—Sr1—O1—C1 | 8.1 (3) | O1—C1—C2—C4 | −142.6 (6) |
O2W—Sr1—O1—C1 | 110.8 (3) | O2—C1—C2—C4 | 41.0 (9) |
O4—Sr1—O1—C1 | −91.2 (3) | Sr1—C1—C2—C4 | −10 (2) |
O5—Sr1—O1—C1 | −51.0 (3) | C3—C2—C4—C5 | 112.9 (9) |
C17—Sr1—O1—C1 | −70.9 (3) | C1—C2—C4—C5 | −105.4 (7) |
Sr1ii—Sr1—O1—C1 | −174.7 (3) | C3—C2—C4—C9 | −66.8 (9) |
Sr1i—Sr1—O1—C1 | −17.9 (3) | C1—C2—C4—C9 | 74.9 (8) |
O5i—Sr1—O1—Sr1ii | −157.66 (11) | C9—C4—C5—C6 | −1.6 (8) |
O1ii—Sr1—O1—Sr1ii | 0.0 | C2—C4—C5—C6 | 178.7 (5) |
O1W—Sr1—O1—Sr1ii | 45.4 (4) | C4—C5—C6—C7 | 0.0 (9) |
O2—Sr1—O1—Sr1ii | −177.2 (2) | C5—C6—C7—C8 | 1.4 (9) |
O2W—Sr1—O1—Sr1ii | −74.52 (13) | C6—C7—C8—C9 | −1.0 (8) |
O4—Sr1—O1—Sr1ii | 83.54 (13) | C6—C7—C8—C10 | 175.2 (5) |
O5—Sr1—O1—Sr1ii | 123.71 (12) | C5—C4—C9—C8 | 1.9 (9) |
C1—Sr1—O1—Sr1ii | 174.7 (3) | C2—C4—C9—C8 | −178.4 (5) |
C17—Sr1—O1—Sr1ii | 103.83 (14) | C7—C8—C9—C4 | −0.6 (8) |
Sr1i—Sr1—O1—Sr1ii | 156.83 (7) | C10—C8—C9—C4 | −176.9 (5) |
O5i—Sr1—O2—C1 | −171.7 (3) | C7—C8—C10—O3 | −145.4 (6) |
O1ii—Sr1—O2—C1 | −11.6 (4) | C9—C8—C10—O3 | 30.8 (9) |
O1W—Sr1—O2—C1 | 147.5 (4) | C7—C8—C10—C11 | 34.2 (8) |
O2W—Sr1—O2—C1 | −83.4 (3) | C9—C8—C10—C11 | −149.6 (6) |
O4—Sr1—O2—C1 | 64.1 (3) | O3—C10—C11—C12 | 34.6 (10) |
O5—Sr1—O2—C1 | 111.7 (3) | C8—C10—C11—C12 | −145.0 (6) |
O1—Sr1—O2—C1 | −8.2 (3) | O3—C10—C11—C16 | −142.9 (7) |
C17—Sr1—O2—C1 | 87.4 (3) | C8—C10—C11—C16 | 37.5 (9) |
Sr1ii—Sr1—O2—C1 | −9.9 (3) | C16—C11—C12—C13 | −1.3 (11) |
Sr1i—Sr1—O2—C1 | 147.8 (3) | C10—C11—C12—C13 | −178.9 (7) |
O5i—Sr1—O4—C17 | 1.2 (4) | C11—C12—C13—C14 | 3.0 (13) |
O1ii—Sr1—O4—C17 | −159.0 (3) | C12—C13—C14—C15 | −2.2 (13) |
O1W—Sr1—O4—C17 | −71.1 (3) | C13—C14—C15—C16 | −0.1 (13) |
O2—Sr1—O4—C17 | 74.3 (3) | C12—C11—C16—C15 | −1.1 (10) |
O2W—Sr1—O4—C17 | 164.7 (3) | C10—C11—C16—C15 | 176.4 (6) |
O5—Sr1—O4—C17 | −0.4 (3) | C14—C15—C16—C11 | 1.8 (11) |
O1—Sr1—O4—C17 | 121.3 (3) | Sr1i—O5—C17—O4 | −174.3 (9) |
C1—Sr1—O4—C17 | 96.3 (3) | Sr1—O5—C17—O4 | −0.8 (5) |
Sr1ii—Sr1—O4—C17 | 159.0 (3) | Sr1i—O5—C17—C18 | 4.7 (15) |
Sr1i—Sr1—O4—C17 | 0.4 (3) | Sr1—O5—C17—C18 | 178.2 (4) |
O5i—Sr1—O5—C17 | −178.1 (4) | Sr1i—O5—C17—Sr1 | −173.5 (13) |
O1ii—Sr1—O5—C17 | 26.6 (3) | Sr1—O4—C17—O5 | 0.9 (6) |
O1W—Sr1—O5—C17 | 103.1 (3) | Sr1—O4—C17—C18 | −178.2 (4) |
O2—Sr1—O5—C17 | −97.1 (3) | O5i—Sr1—C17—O5 | 1.8 (4) |
O2W—Sr1—O5—C17 | −153.3 (4) | O1ii—Sr1—C17—O5 | −157.9 (3) |
O4—Sr1—O5—C17 | 0.4 (3) | O1W—Sr1—C17—O5 | −72.1 (3) |
O1—Sr1—O5—C17 | −56.3 (3) | O2—Sr1—C17—O5 | 77.9 (3) |
C1—Sr1—O5—C17 | −74.9 (3) | O2W—Sr1—C17—O5 | 133.8 (6) |
Sr1ii—Sr1—O5—C17 | −22.2 (3) | O4—Sr1—C17—O5 | −179.2 (5) |
Sr1i—Sr1—O5—C17 | −178.1 (4) | O1—Sr1—C17—O5 | 125.3 (3) |
O5i—Sr1—O5—Sr1i | 0.0 | C1—Sr1—C17—O5 | 102.2 (3) |
O1ii—Sr1—O5—Sr1i | −155.29 (11) | Sr1ii—Sr1—C17—O5 | 160.6 (3) |
O1W—Sr1—O5—Sr1i | −78.75 (16) | Sr1i—Sr1—C17—O5 | 1.3 (2) |
O2—Sr1—O5—Sr1i | 81.03 (14) | O5i—Sr1—C17—O4 | −179.0 (3) |
O2W—Sr1—O5—Sr1i | 24.8 (4) | O1ii—Sr1—C17—O4 | 21.3 (3) |
O4—Sr1—O5—Sr1i | 178.6 (2) | O1W—Sr1—C17—O4 | 107.1 (3) |
O1—Sr1—O5—Sr1i | 121.86 (12) | O2—Sr1—C17—O4 | −103.0 (3) |
C1—Sr1—O5—Sr1i | 103.23 (15) | O2W—Sr1—C17—O4 | −47.1 (9) |
C17—Sr1—O5—Sr1i | 178.1 (4) | O5—Sr1—C17—O4 | 179.2 (5) |
Sr1ii—Sr1—O5—Sr1i | 155.97 (8) | O1—Sr1—C17—O4 | −55.5 (3) |
Sr1ii—O1—C1—O2 | −167.6 (13) | C1—Sr1—C17—O4 | −78.7 (3) |
Sr1—O1—C1—O2 | −14.6 (5) | Sr1ii—Sr1—C17—O4 | −20.2 (3) |
Sr1ii—O1—C1—C2 | 16 (2) | Sr1i—Sr1—C17—O4 | −179.6 (4) |
Sr1—O1—C1—C2 | 169.1 (6) | O5—C17—C18—C19 | 179.2 (5) |
Sr1ii—O1—C1—Sr1 | −153.0 (17) | O4—C17—C18—C19 | −1.7 (7) |
Sr1—O2—C1—O1 | 16.4 (6) | O5—C17—C18—C20 | 52.1 (7) |
Sr1—O2—C1—C2 | −167.2 (5) | O4—C17—C18—C20 | −128.8 (5) |
O5i—Sr1—C1—O1 | −156.7 (3) | C19—C18—C20—C25 | −98.5 (6) |
O1ii—Sr1—C1—O1 | 5.3 (3) | C17—C18—C20—C25 | 29.4 (7) |
O1W—Sr1—C1—O1 | 124.3 (4) | C19—C18—C20—C21 | 79.5 (7) |
O2—Sr1—C1—O1 | −165.1 (5) | C17—C18—C20—C21 | −152.6 (5) |
O2W—Sr1—C1—O1 | −67.6 (3) | C25—C20—C21—C22 | −2.2 (8) |
O4—Sr1—C1—O1 | 82.4 (3) | C18—C20—C21—C22 | 179.8 (5) |
O5—Sr1—C1—O1 | 130.2 (3) | C20—C21—C22—C23 | −0.7 (8) |
C17—Sr1—C1—O1 | 106.6 (3) | C21—C22—C23—C24 | 3.3 (9) |
Sr1ii—Sr1—C1—O1 | 3.6 (2) | C22—C23—C24—C25 | −3.0 (8) |
Sr1i—Sr1—C1—O1 | 164.1 (3) | C22—C23—C24—C26 | 175.8 (5) |
O5i—Sr1—C1—O2 | 8.3 (3) | C21—C20—C25—C24 | 2.4 (8) |
O1ii—Sr1—C1—O2 | 170.3 (3) | C18—C20—C25—C24 | −179.6 (5) |
O1W—Sr1—C1—O2 | −70.7 (6) | C23—C24—C25—C20 | 0.1 (8) |
O2W—Sr1—C1—O2 | 97.4 (3) | C26—C24—C25—C20 | −178.7 (5) |
O4—Sr1—C1—O2 | −112.5 (3) | C23—C24—C26—O6 | −143.7 (6) |
O5—Sr1—C1—O2 | −64.8 (3) | C25—C24—C26—O6 | 35.1 (8) |
O1—Sr1—C1—O2 | 165.1 (5) | C23—C24—C26—C27 | 35.8 (8) |
C17—Sr1—C1—O2 | −88.4 (3) | C25—C24—C26—C27 | −145.4 (5) |
Sr1ii—Sr1—C1—O2 | 168.6 (4) | O6—C26—C27—C28 | −145.7 (6) |
Sr1i—Sr1—C1—O2 | −30.8 (3) | C24—C26—C27—C28 | 34.8 (8) |
O5i—Sr1—C1—C2 | 65.8 (19) | O6—C26—C27—C32 | 30.7 (9) |
O1ii—Sr1—C1—C2 | −132.2 (19) | C24—C26—C27—C32 | −148.8 (5) |
O1W—Sr1—C1—C2 | −13 (2) | C32—C27—C28—C29 | −1.1 (9) |
O2—Sr1—C1—C2 | 57.5 (18) | C26—C27—C28—C29 | 175.3 (6) |
O2W—Sr1—C1—C2 | 154.9 (19) | C27—C28—C29—C30 | 1.8 (10) |
O4—Sr1—C1—C2 | −55.1 (19) | C28—C29—C30—C31 | −1.3 (12) |
O5—Sr1—C1—C2 | −7.3 (19) | C29—C30—C31—C32 | 0.1 (12) |
O1—Sr1—C1—C2 | −137 (2) | C30—C31—C32—C27 | 0.6 (10) |
C17—Sr1—C1—C2 | −30.9 (19) | C28—C27—C32—C31 | −0.1 (9) |
Sr1ii—Sr1—C1—C2 | −133.9 (19) | C26—C27—C32—C31 | −176.6 (6) |
Sr1i—Sr1—C1—C2 | 26.6 (19) |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y+2, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1W2···O2i | 0.85 (1) | 1.83 (1) | 2.678 (5) | 171 (6) |
O2W—H2W2···O4ii | 0.85 (1) | 1.89 (2) | 2.724 (5) | 166 (6) |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y+2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Sr(C16H13O3)2(H2O)2] |
Mr | 630.18 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 295 |
a, b, c (Å) | 18.665 (4), 8.0406 (16), 19.377 (4) |
β (°) | 93.26 (3) |
V (Å3) | 2903.4 (10) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 1.91 |
Crystal size (mm) | 0.30 × 0.25 × 0.18 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID diffractometer |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.598, 0.725 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 22141, 5107, 2941 |
Rint | 0.087 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.050, 0.136, 1.08 |
No. of reflections | 5107 |
No. of parameters | 385 |
No. of restraints | 7 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.69, −0.96 |
Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEPII (Johnson, 1976).
Sr1—O5i | 2.496 (3) | Sr1—O2W | 2.559 (4) |
Sr1—O1ii | 2.514 (3) | Sr1—O4 | 2.590 (4) |
Sr1—O1W | 2.529 (4) | Sr1—O5 | 2.772 (3) |
Sr1—O2 | 2.557 (4) | Sr1—O1 | 2.816 (3) |
O5i—Sr1—O1ii | 150.60 (11) | O2W—Sr1—O4 | 147.50 (11) |
O5i—Sr1—O1W | 75.52 (13) | O5i—Sr1—O5 | 74.36 (12) |
O1ii—Sr1—O1W | 87.76 (11) | O1ii—Sr1—O5 | 125.00 (11) |
O5i—Sr1—O2 | 77.86 (11) | O1W—Sr1—O5 | 75.31 (14) |
O1ii—Sr1—O2 | 125.34 (10) | O2—Sr1—O5 | 76.14 (12) |
O1W—Sr1—O2 | 145.14 (12) | O2W—Sr1—O5 | 161.83 (11) |
O5i—Sr1—O2W | 89.06 (11) | O4—Sr1—O5 | 48.03 (10) |
O1ii—Sr1—O2W | 73.17 (12) | O5i—Sr1—O1 | 123.47 (11) |
O1W—Sr1—O2W | 108.15 (16) | O1ii—Sr1—O1 | 77.71 (11) |
O2—Sr1—O2W | 93.41 (14) | O1W—Sr1—O1 | 159.64 (14) |
O5i—Sr1—O4 | 122.37 (11) | O2—Sr1—O1 | 47.69 (10) |
O1ii—Sr1—O4 | 80.61 (11) | O2W—Sr1—O1 | 81.43 (12) |
O1W—Sr1—O4 | 89.33 (16) | O4—Sr1—O1 | 74.41 (11) |
O2—Sr1—O4 | 86.23 (13) | O5—Sr1—O1 | 101.34 (10) |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y+2, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1W2···O2i | 0.852 (10) | 1.833 (13) | 2.678 (5) | 171 (6) |
O2W—H2W2···O4ii | 0.852 (10) | 1.889 (17) | 2.724 (5) | 166 (6) |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y+2, −z+1. |
Acknowledgements
The authors thank the Project of Heilongjiang Provincial Health Office (No. 2009–246) and Harbin Medical University for supporting this work.
References
Higashi, T. (1995). ABSCOR. Rigaku Corporation, Tokyo, Japan. Google Scholar
Johnson, C. K. (1976). ORTEPII. Report ORNL-5138. Oak Ridge National Laboratory, Tennessee, USA. Google Scholar
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2-(3-Benzoylphenyl)propanoic acid is known as nonsteroidal anti-inflamatory drug. To date, some reports on the structure of its metal complexes (Tahir et al., 1997; Zhang et al., 2007a,b) have been documented. In this paper, we present a novel 1-D SrII coordination polymer, [Sr(C16H13O3)2(H2O)2]n, (I). Its crystal structure is described here. As illustrated in Fig. 1, the complex (I) consists of one SrII cation, two 2-(3-benzoylphenyl)propanoate ligands and two coordinated water molecules. The local coordination environment around the SrII cation can be described as a distort dodecahedron, involving six oxygen atoms of four different 2-(3-benzoylphenyl)propanoate ligands and two coordinated water molecules. The 2-(3-benzoylphenyl)propanoate acts as bidentate bridging ligand to link adjacent SrII cations, leading to a 1-D chain along b axis direction (Fig. 2.), with the Sr···Sr separation of 4.1548 (8) Å. A 3-D supramolecular network structure is formed through the extended hydrogen-bonding interactions between water molecules and carboxylate O atoms (Table 2).