metal-organic compounds
Hydrothermal synthesis and
of a new lanthanum(III) coordination polymer with fumaric acidaUnité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Constantine 1, 25000 , Algeria, and bDépartement Sciences de la Matière, Faculté des Sciences Exactes et Sciences de la Nature et de la Vie, Université Larbi Ben M'hidi, Oum El Bouaghi, Algeria
*Correspondence e-mail: bouacida_sofiane@yahoo.fr
The title compound, poly[diaquatris(μ4-but-2-enedioato)(μ2-but-2-enedioic acid)dilanthanum(III)], [La2(C4H2O4)3(C4H4O4)(H2O)2]n, was synthesized by the reaction of lanthanum chloride pentahydrate with fumaric acid under hydrothermal conditions. The comprises an LaIII cation, one and a half fumarate dianions (L2−), one a half-molecule of fumaric acid (H2L) and one coordinated water molecule. Each LaIII cation has the same nine-coordinate environment and is surrounded by eight O atoms from seven distinct fumarate moieties, including one protonated fumarate unit and one water molecule in a distorted tricapped trigonal–prismatic environment. The LaO8(H2O) polyhedra centres are edge-shared through three carboxylate bridges of the fumarate ligand, forming chains in three dimensions to construct the MOF. The is stabilized by O—H⋯O hydrogen-bond interactions between the coordinated water molecule and the carboxylate O atoms, and also between oxygen atoms of fumaric acid
Keywords: crystal structure; hydrothermal synthesis; lanthanum(III) coordination polymer; fumaric acid.
CCDC reference: 1058359
1. Related literature
For general background to metal coordination polymers, see: Fujita et al. (1994); Bénard et al. (2000); Zhang et al. (2000). For structures involving fumarate ligands and transition metals, see: Dalai et al. (2002); Xie et al. (2003); Devereux et al. (2000). For rare earth fumarates, see: Zhang et al. (2006); Li & Zou (2006); Liu et al. (2011). For reported La—O distances, see: Dan et al. (2005).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: APEX2 (Bruker, 2011); cell SAINT (Bruker, 2011); data reduction: SAINT; program(s) used to solve structure: SIR2002 (Burla et al., 2005); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg & Berndt, 2001); software used to prepare material for publication: WinGX (Farrugia, 2012) and CRYSCAL (T. Roisnel, local program).
Supporting information
CCDC reference: 1058359
https://doi.org/10.1107/S2056989015007008/lh5759sup1.cif
contains datablock I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989015007008/lh5759Isup2.hkl
All chemicals were purchased from commercial sources and used as received without further purification. The title compound, was synthesized by using a hydrothermal method. Typically mixtures of fumaric acid (1 mmol, 0.116 g), lanthanum (III) chloride pentahydrate (0.5 mmol, 0.185 g) were suspended in H2O (ca 10 ml). The mixture was then placed in a Teflon lined autoclave, sealed and heated to 413 K for 2 days. The reactor was cooled to room temperature over a period of 1 h. The light brown crystals suitable for X-ray diffraction were filtered, washed with water and dried in air.
All non-H atoms were refined with anisotropic atomic displacement parameters. The remaining H atoms were located in difference Fourier maps but introduced in calculated positions and treated as riding on their parent atom (C and O atoms) with C—H = 0.93 Å and O—H = 0.82 Å with Uiso(H) = 1.2 or 1.5Ueq(C,O). H atoms of the water molecule were located in difference Fourier maps and refined isotropically.
Coordination polymers of metal cations with organic multifunctional ligands have been received increasing interest, for these coordination polymers have one-, two-, three dimensional structures as well as potential applications as catalysts, magnetic and porous materials (Fujita et al., 1994; Bénard et al., 2000; Zhang et al., 2000). Multi-carboxyle ligands are useful to construct unique architectures of metal-coordination polymers. The synthesis of novel lanthanide polymers and studies on luminescent, electric and magnetic properties of the compounds are of interest. Some metal coordination polymers using fumaric acid as ligand have been reported in the literature containing transition metals Cu (Dalai et al., 2002), Zn (Xie et al., 2003), and Mn (Devereux et al., 2000). A series of rare earth fumarate complexes have also been reported (Zhang et al., 2006; Li & Zou., 2006; Liu et al., 2011). Hydrothermal synthesis has some advantages over conventional methods for the formation of a polymer framework with higher dimensions. Fumaric acid was used to synthesize a new lanthanum (III) coordination polymer, [La2(C4H2O4)3(C4H4O4)(H2O)2]n, (I), by using hydrothermal synthesis method and the
is reported in the present article.The structure of the
of the title complex is shown in Fig. 1. It comprises a LaIII cation, 1.5 fumarate dianions (L2-), 0.5 fumaric acid (H2L) and one water ligand. Overall there are three types of La—O bridging modes in (I), the fumarate dianion exhibits full monodentate and µ2-oxo-bridged chelating patterns, respectively, whereas the fumaric acid shows a double monodentate coordination mode. The LaIII cation is sited within a distorted tricapped trigonal prism defined by nine O atoms derived from seven different bridging ligands and a coordinated water molecule. One of the carboxylate groups, derived from L2-, is chelating, and the remaining six carboxylates coordinate in a monodentate mode. The average La—O bond distance of LaO8(H2O) polyhedra is 2.56 Å; the shortest La—O separation is 2.4510 (12) Å, resulting from the La1—O1 bond of a bridging carboxylate, and the longest is 2.7696 (12) Å for La1—O7 from the edge-sharing La—O bond. Other distances of La—O(fum) vary in the range of 2.4963 (12)–2.6117 (13) Å, comparable to the usual La—O(carboxylate) bonds reported (Dan et al., 2005). The LaO8(H2O) coordination polyhedra are edge-shared through one monodentate carboxylate O atoms (O7) and two bidentate carboxylate groups (O3—C4—O4 and O1—C1—O2) to generate infinite lanthanum-oxygen chains (Fig. 2). The adjacent lanthanum (III) centres have a general separation of 4.739 Å. Furthermore, the one-dimensional infinite chains are linked together with monodentate fumarate ligands to form a two-dimensional layered paralell to the crystallographic (100) (Fig.2), and the shortest interlayer distance of La···La is 8.430 Å (calculated between the two lanthanum atom centres). This type of organic-inorganic layered structure has been reported of the lanthanide fumarates: [Ln2(fum)3(H2fum)(H2O)2 (Ln: Ce or Nd)] (Zhang et al., 2006). Finally, the two-dimensional layered structure is further constructed into a three-dimensional open framework by the ligands (Fig.3). The crystal is stabilized by hydrogen bond interactions between the coordinated water and carboxylate O atoms.For general background to metal coordination polymers, see: Fujita et al. (1994); Bénard et al. (2000); Zhang et al. (2000). For structures involving fumarate ligands and transition metals, see: Dalai et al. (2002); Xie et al. (2003); Devereux et al. (2000). For rare earth fumarates, see: Zhang et al. (2006); Li & Zou (2006); Liu et al. (2011). For reported La—O distances, see: Dan et al. (2005).
Data collection: APEX2 (Bruker, 2011); cell
SAINT (Bruker, 2011); data reduction: SAINT (Bruker, 2011); program(s) used to solve structure: SIR2002 (Burla et al., 2005); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg & Berndt, 2001); software used to prepare material for publication: WinGX (Farrugia, 2012) and CRYSCAL (T. Roisnel, local program).[La2(C4H2O4)3(C4H4O4)(H2O)2] | F(000) = 736 |
Mr = 386.05 | Dx = 2.417 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 7844 reflections |
a = 8.4299 (5) Å | θ = 2.8–34.5° |
b = 14.6789 (8) Å | µ = 4.07 mm−1 |
c = 8.8096 (5) Å | T = 295 K |
β = 103.318 (3)° | Prism, brown |
V = 1060.80 (11) Å3 | 0.12 × 0.11 × 0.08 mm |
Z = 4 |
Bruker APEXII diffractometer | 3901 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
CCD rotation images, thin slices scans | θmax = 34.6°, θmin = 2.5° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2002) | h = −13→13 |
Tmin = 0.677, Tmax = 0.796 | k = −23→22 |
17677 measured reflections | l = −14→14 |
4523 independent reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.020 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.043 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | w = 1/[σ2(Fo2) + (0.0198P)2 + 0.4033P] where P = (Fo2 + 2Fc2)/3 |
4523 reflections | (Δ/σ)max = 0.003 |
171 parameters | Δρmax = 2.06 e Å−3 |
0 restraints | Δρmin = −0.67 e Å−3 |
[La2(C4H2O4)3(C4H4O4)(H2O)2] | V = 1060.80 (11) Å3 |
Mr = 386.05 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.4299 (5) Å | µ = 4.07 mm−1 |
b = 14.6789 (8) Å | T = 295 K |
c = 8.8096 (5) Å | 0.12 × 0.11 × 0.08 mm |
β = 103.318 (3)° |
Bruker APEXII diffractometer | 4523 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2002) | 3901 reflections with I > 2σ(I) |
Tmin = 0.677, Tmax = 0.796 | Rint = 0.027 |
17677 measured reflections |
R[F2 > 2σ(F2)] = 0.020 | 0 restraints |
wR(F2) = 0.043 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | Δρmax = 2.06 e Å−3 |
4523 reflections | Δρmin = −0.67 e Å−3 |
171 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.91794 (19) | 0.17630 (11) | 0.3525 (2) | 0.0094 (3) | |
C2 | 1.09547 (19) | 0.16975 (12) | 0.3538 (2) | 0.0116 (3) | |
H2 | 1.1677 | 0.1528 | 0.4461 | 0.014* | |
C3 | 1.1551 (2) | 0.18705 (11) | 0.22925 (19) | 0.0104 (3) | |
H3 | 1.0842 | 0.2006 | 0.1344 | 0.012* | |
C4 | 1.33672 (18) | 0.18480 (11) | 0.24064 (19) | 0.0091 (3) | |
C5 | 0.9759 (2) | 0.43916 (12) | 0.3056 (2) | 0.0136 (3) | |
C6 | 1.0339 (2) | 0.50146 (12) | 0.4385 (2) | 0.0137 (3) | |
H6 | 1.1173 | 0.5426 | 0.4366 | 0.016* | |
C7 | 0.53342 (19) | 0.10280 (11) | −0.12552 (19) | 0.0100 (3) | |
C8 | 0.5242 (2) | 0.04320 (11) | 0.0094 (2) | 0.0115 (3) | |
H8 | 0.5533 | 0.0672 | 0.1098 | 0.014* | |
O1 | 0.81442 (14) | 0.18896 (8) | 0.22694 (15) | 0.0121 (2) | |
O2 | 0.88376 (15) | 0.16822 (9) | 0.48504 (15) | 0.0135 (2) | |
O1W | 0.68340 (16) | 0.47790 (9) | 0.02557 (17) | 0.0140 (2) | |
O3 | 1.38637 (14) | 0.22346 (9) | 0.13278 (15) | 0.0128 (2) | |
O4 | 1.42800 (14) | 0.14400 (8) | 0.35629 (14) | 0.0113 (2) | |
O5 | 1.05314 (17) | 0.44700 (11) | 0.19286 (17) | 0.0232 (3) | |
H5 | 1.0152 | 0.4107 | 0.1232 | 0.035* | |
O6 | 0.86412 (16) | 0.38537 (9) | 0.30246 (15) | 0.0165 (3) | |
O7 | 0.59366 (15) | 0.18252 (8) | −0.09912 (15) | 0.0106 (2) | |
O8 | 0.48750 (15) | 0.07304 (9) | −0.26313 (14) | 0.0145 (2) | |
La1 | 0.631512 (10) | 0.309568 (6) | 0.097101 (10) | 0.00675 (3) | |
H1W | 0.656 (3) | 0.4969 (19) | −0.062 (4) | 0.030 (7)* | |
H2W | 0.651 (3) | 0.513 (2) | 0.071 (4) | 0.036 (8)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0093 (6) | 0.0092 (7) | 0.0107 (7) | 0.0008 (5) | 0.0044 (5) | 0.0017 (5) |
C2 | 0.0082 (6) | 0.0166 (8) | 0.0099 (7) | 0.0000 (5) | 0.0019 (5) | 0.0009 (6) |
C3 | 0.0115 (6) | 0.0117 (7) | 0.0090 (6) | −0.0008 (5) | 0.0045 (5) | 0.0017 (6) |
C4 | 0.0075 (6) | 0.0111 (7) | 0.0088 (6) | −0.0007 (5) | 0.0021 (5) | −0.0002 (5) |
C5 | 0.0131 (7) | 0.0166 (8) | 0.0108 (7) | −0.0010 (6) | 0.0021 (6) | −0.0006 (6) |
C6 | 0.0142 (7) | 0.0153 (8) | 0.0113 (7) | −0.0037 (6) | 0.0021 (6) | −0.0020 (6) |
C7 | 0.0113 (6) | 0.0107 (7) | 0.0088 (7) | −0.0007 (5) | 0.0036 (5) | −0.0001 (5) |
C8 | 0.0170 (7) | 0.0099 (7) | 0.0085 (7) | −0.0018 (6) | 0.0046 (6) | 0.0000 (5) |
O1 | 0.0097 (5) | 0.0139 (6) | 0.0117 (5) | 0.0015 (4) | 0.0005 (4) | 0.0016 (5) |
O2 | 0.0118 (5) | 0.0187 (6) | 0.0117 (6) | 0.0027 (4) | 0.0063 (4) | 0.0031 (5) |
O1W | 0.0171 (6) | 0.0110 (6) | 0.0141 (6) | 0.0019 (4) | 0.0040 (5) | 0.0016 (5) |
O3 | 0.0105 (5) | 0.0175 (6) | 0.0113 (6) | −0.0030 (4) | 0.0043 (4) | 0.0025 (5) |
O4 | 0.0095 (5) | 0.0133 (6) | 0.0102 (5) | 0.0009 (4) | 0.0006 (4) | 0.0002 (4) |
O5 | 0.0213 (7) | 0.0347 (8) | 0.0161 (6) | −0.0129 (6) | 0.0094 (5) | −0.0119 (6) |
O6 | 0.0180 (6) | 0.0191 (7) | 0.0118 (6) | −0.0075 (5) | 0.0024 (5) | −0.0026 (5) |
O7 | 0.0138 (5) | 0.0082 (5) | 0.0108 (5) | −0.0019 (4) | 0.0051 (4) | −0.0010 (4) |
O8 | 0.0218 (6) | 0.0138 (6) | 0.0086 (5) | −0.0061 (5) | 0.0051 (5) | −0.0017 (5) |
La1 | 0.00657 (4) | 0.00743 (4) | 0.00650 (4) | −0.00024 (3) | 0.00204 (3) | −0.00044 (3) |
C1—O1 | 1.255 (2) | C8—H8 | 0.93 |
C1—O2 | 1.271 (2) | O1W—H1W | 0.80 (3) |
C1—C2 | 1.497 (2) | O1W—H2W | 0.75 (3) |
C2—C3 | 1.332 (2) | O3—La1iv | 2.5032 (11) |
C2—H2 | 0.93 | O4—La1v | 2.4963 (12) |
C3—C4 | 1.512 (2) | O5—H5 | 0.82 |
C3—H3 | 0.93 | La1—C7vi | 3.0398 (15) |
C4—O3 | 1.2583 (19) | O6—La1 | 2.5926 (13) |
C4—O4 | 1.276 (2) | O7—La1 | 2.5127 (12) |
C5—O6 | 1.225 (2) | O1—La1 | 2.4510 (12) |
C5—O5 | 1.312 (2) | O1W—La1 | 2.6117 (13) |
C5—C6 | 1.477 (2) | O2—La1vi | 2.5631 (11) |
C6—C6i | 1.338 (3) | O7—La1ii | 2.7696 (12) |
C6—H6 | 0.93 | O8—La1ii | 2.5784 (12) |
C7—O8 | 1.263 (2) | La1—O4vii | 2.4963 (12) |
C7—O7 | 1.2755 (19) | La1—O3viii | 2.5032 (11) |
C7—C8 | 1.492 (2) | La1—O2ii | 2.5631 (11) |
C7—La1ii | 3.0398 (15) | La1—O8vi | 2.5784 (12) |
C8—C8iii | 1.331 (3) | La1—O7vi | 2.7696 (12) |
O1—C1—O2 | 124.39 (15) | O1—La1—O7 | 75.61 (4) |
O1—C1—C2 | 120.47 (14) | O4vii—La1—O7 | 70.40 (4) |
O2—C1—C2 | 115.14 (15) | O3viii—La1—O7 | 74.57 (4) |
C3—C2—C1 | 123.19 (16) | O1—La1—O2ii | 77.47 (4) |
C3—C2—H2 | 118.4 | O4vii—La1—O2ii | 96.12 (4) |
C1—C2—H2 | 118.4 | O3viii—La1—O2ii | 153.47 (4) |
C2—C3—C4 | 120.64 (15) | O7—La1—O2ii | 79.32 (4) |
C2—C3—H3 | 119.7 | O1—La1—O8vi | 125.08 (4) |
C4—C3—H3 | 119.7 | O4vii—La1—O8vi | 85.20 (4) |
O3—C4—O4 | 124.78 (14) | O3viii—La1—O8vi | 77.55 (4) |
O3—C4—C3 | 116.62 (14) | O7—La1—O8vi | 145.63 (4) |
O4—C4—C3 | 118.60 (13) | O2ii—La1—O8vi | 128.50 (4) |
O6—C5—O5 | 123.56 (17) | O1—La1—O6 | 72.00 (4) |
O6—C5—C6 | 121.97 (15) | O4vii—La1—O6 | 137.48 (4) |
O5—C5—C6 | 114.46 (15) | O3viii—La1—O6 | 129.99 (4) |
C6i—C6—C5 | 119.8 (2) | O7—La1—O6 | 138.97 (4) |
C6i—C6—H6 | 120.1 | O2ii—La1—O6 | 69.69 (4) |
C5—C6—H6 | 120.1 | O8vi—La1—O6 | 75.14 (4) |
O8—C7—O7 | 120.91 (15) | O1—La1—O1W | 132.35 (4) |
O8—C7—C8 | 120.09 (15) | O4vii—La1—O1W | 69.95 (4) |
O7—C7—C8 | 118.95 (15) | O3viii—La1—O1W | 134.19 (4) |
O8—C7—La1ii | 56.95 (8) | O7—La1—O1W | 122.55 (4) |
O7—C7—La1ii | 65.65 (8) | O2ii—La1—O1W | 65.59 (4) |
C8—C7—La1ii | 164.17 (11) | O8vi—La1—O1W | 66.82 (4) |
C8iii—C8—C7 | 122.0 (2) | O6—La1—O1W | 67.70 (4) |
C8iii—C8—H8 | 119 | O1—La1—O7vi | 77.26 (4) |
C7—C8—H8 | 119 | O4vii—La1—O7vi | 126.88 (4) |
C1—O1—La1 | 138.87 (11) | O3viii—La1—O7vi | 67.52 (4) |
C1—O2—La1vi | 136.53 (11) | O7—La1—O7vi | 132.16 (3) |
La1—O1W—H1W | 122 (2) | O2ii—La1—O7vi | 131.09 (4) |
La1—O1W—H2W | 116 (2) | O8vi—La1—O7vi | 48.61 (4) |
H1W—O1W—H2W | 102 (3) | O6—La1—O7vi | 62.92 (4) |
C4—O3—La1iv | 138.62 (11) | O1W—La1—O7vi | 104.86 (4) |
C4—O4—La1v | 136.10 (11) | O1—La1—C7vi | 100.89 (4) |
C5—O5—H5 | 109.5 | O4vii—La1—C7vi | 107.86 (4) |
C5—O6—La1 | 138.30 (12) | O3viii—La1—C7vi | 74.18 (4) |
C7—O7—La1 | 142.04 (10) | O7—La1—C7vi | 148.44 (4) |
C7—O7—La1ii | 89.54 (9) | O2ii—La1—C7vi | 131.24 (4) |
La1—O7—La1ii | 127.52 (4) | O8vi—La1—C7vi | 24.23 (4) |
C7—O8—La1ii | 98.82 (10) | O6—La1—C7vi | 63.86 (4) |
O1—La1—O4vii | 146.01 (4) | O1W—La1—C7vi | 83.41 (4) |
O1—La1—O3viii | 91.46 (4) | O7vi—La1—C7vi | 24.81 (4) |
O4vii—La1—O3viii | 79.57 (4) | ||
O1—C1—C2—C3 | 8.0 (3) | C1—O1—La1—O6 | 22.16 (15) |
O2—C1—C2—C3 | −171.99 (16) | C1—O1—La1—O1W | 55.44 (17) |
C1—C2—C3—C4 | 176.25 (15) | C1—O1—La1—O7vi | −43.17 (16) |
C2—C3—C4—O3 | −162.53 (16) | C1—O1—La1—C7vi | −35.55 (16) |
C2—C3—C4—O4 | 18.0 (2) | C7—O7—La1—O1 | 70.34 (18) |
O6—C5—C6—C6i | 1.5 (3) | La1ii—O7—La1—O1 | −124.25 (6) |
O5—C5—C6—C6i | −178.9 (2) | C7—O7—La1—O4vii | −109.49 (18) |
O8—C7—C8—C8iii | 3.3 (3) | La1ii—O7—La1—O4vii | 55.92 (6) |
O7—C7—C8—C8iii | −174.2 (2) | C7—O7—La1—O3viii | −25.29 (17) |
La1ii—C7—C8—C8iii | −71.3 (5) | La1ii—O7—La1—O3viii | 140.12 (7) |
O2—C1—O1—La1 | 70.6 (2) | C7—O7—La1—O2ii | 150.00 (18) |
C2—C1—O1—La1 | −109.40 (17) | La1ii—O7—La1—O2ii | −44.59 (6) |
O1—C1—O2—La1vi | −9.9 (3) | C7—O7—La1—O8vi | −62.2 (2) |
C2—C1—O2—La1vi | 170.08 (11) | La1ii—O7—La1—O8vi | 103.23 (7) |
O4—C4—O3—La1iv | −33.2 (3) | C7—O7—La1—O6 | 109.01 (17) |
C3—C4—O3—La1iv | 147.30 (13) | La1ii—O7—La1—O6 | −85.58 (8) |
O3—C4—O4—La1v | 72.1 (2) | C7—O7—La1—O1W | −158.26 (17) |
C3—C4—O4—La1v | −108.47 (15) | La1ii—O7—La1—O1W | 7.15 (8) |
O5—C5—O6—La1 | −30.8 (3) | C7—O7—La1—O7vi | 13.0 (2) |
C6—C5—O6—La1 | 148.76 (14) | La1ii—O7—La1—O7vi | 178.394 (15) |
O8—C7—O7—La1 | 154.08 (13) | C7—O7—La1—C7vi | −17.1 (2) |
C8—C7—O7—La1 | −28.5 (3) | La1ii—O7—La1—C7vi | 148.33 (6) |
La1ii—C7—O7—La1 | 168.47 (17) | C5—O6—La1—O1 | 117.06 (19) |
O8—C7—O7—La1ii | −14.40 (15) | C5—O6—La1—O4vii | −42.3 (2) |
C8—C7—O7—La1ii | 163.03 (13) | C5—O6—La1—O3viii | −166.68 (17) |
O7—C7—O8—La1ii | 15.68 (17) | C5—O6—La1—O7 | 77.5 (2) |
C8—C7—O8—La1ii | −161.72 (12) | C5—O6—La1—O2ii | 34.12 (18) |
C1—O1—La1—O4vii | 176.91 (14) | C5—O6—La1—O8vi | −107.59 (19) |
C1—O1—La1—O3viii | −109.72 (16) | C5—O6—La1—O1W | −36.94 (18) |
C1—O1—La1—O7 | 176.62 (16) | C5—O6—La1—O7vi | −158.3 (2) |
C1—O1—La1—O2ii | 94.61 (16) | C5—O6—La1—C7vi | −130.57 (19) |
C1—O1—La1—O8vi | −33.94 (17) |
Symmetry codes: (i) −x+2, −y+1, −z+1; (ii) x, −y+1/2, z−1/2; (iii) −x+1, −y, −z; (iv) x+1, y, z; (v) x+1, −y+1/2, z+1/2; (vi) x, −y+1/2, z+1/2; (vii) x−1, −y+1/2, z−1/2; (viii) x−1, y, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1W···O8ix | 0.80 (3) | 2.06 (3) | 2.7995 (19) | 154 (3) |
O1W—H2W···O4x | 0.75 (3) | 2.17 (3) | 2.8913 (18) | 163 (3) |
O5—H5···O2ii | 0.82 | 1.85 | 2.655 (2) | 167 |
Symmetry codes: (ii) x, −y+1/2, z−1/2; (ix) −x+1, y+1/2, −z−1/2; (x) −x+2, y+1/2, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1W···O8i | 0.80 (3) | 2.06 (3) | 2.7995 (19) | 154 (3) |
O1W—H2W···O4ii | 0.75 (3) | 2.17 (3) | 2.8913 (18) | 163 (3) |
O5—H5···O2iii | 0.8200 | 1.8500 | 2.655 (2) | 167.00 |
Symmetry codes: (i) −x+1, y+1/2, −z−1/2; (ii) −x+2, y+1/2, −z+1/2; (iii) x, −y+1/2, z−1/2. |
Acknowledgements
The authors thank Professor Mhamed Boudraa, Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Constantine 1 Algeria, for his technical assistance with the single-crystal X-ray data collection.
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Coordination polymers of metal cations with organic multifunctional ligands have been received increasing interest, for these coordination polymers have one-, two-, three dimensional structures as well as potential applications as catalysts, magnetic and porous materials (Fujita et al., 1994; Bénard et al., 2000; Zhang et al., 2000). Multi-carboxyle ligands are useful to construct unique architectures of metal-coordination polymers. The synthesis of novel lanthanide polymers and studies on luminescent, electric and magnetic properties of the compounds are of interest. Some metal coordination polymers using fumaric acid as ligand have been reported in the literature containing transition metals Cu (Dalai et al., 2002), Zn (Xie et al., 2003), and Mn (Devereux et al., 2000). A series of rare earth fumarate complexes have also been reported (Zhang et al., 2006; Li & Zou., 2006; Liu et al., 2011). Hydrothermal synthesis has some advantages over conventional methods for the formation of a polymer framework with higher dimensions. Fumaric acid was used to synthesize a new lanthanum (III) coordination polymer, [La2(C4H2O4)3(C4H4O4)(H2O)2]n, (I), by using hydrothermal synthesis method and the crystal structure is reported in the present article.
The structure of the asymmetric unit of the title complex is shown in Fig. 1. It comprises a LaIII cation, 1.5 fumarate dianions (L2-), 0.5 fumaric acid (H2L) and one water ligand. Overall there are three types of La—O bridging modes in (I), the fumarate dianion exhibits full monodentate and µ2-oxo-bridged chelating patterns, respectively, whereas the fumaric acid shows a double monodentate coordination mode. The LaIII cation is sited within a distorted tricapped trigonal prism defined by nine O atoms derived from seven different bridging ligands and a coordinated water molecule. One of the carboxylate groups, derived from L2-, is chelating, and the remaining six carboxylates coordinate in a monodentate mode. The average La—O bond distance of LaO8(H2O) polyhedra is 2.56 Å; the shortest La—O separation is 2.4510 (12) Å, resulting from the La1—O1 bond of a bridging carboxylate, and the longest is 2.7696 (12) Å for La1—O7 from the edge-sharing La—O bond. Other distances of La—O(fum) vary in the range of 2.4963 (12)–2.6117 (13) Å, comparable to the usual La—O(carboxylate) bonds reported (Dan et al., 2005). The LaO8(H2O) coordination polyhedra are edge-shared through one monodentate carboxylate O atoms (O7) and two bidentate carboxylate groups (O3—C4—O4 and O1—C1—O2) to generate infinite lanthanum-oxygen chains (Fig. 2). The adjacent lanthanum (III) centres have a general separation of 4.739 Å. Furthermore, the one-dimensional infinite chains are linked together with monodentate fumarate ligands to form a two-dimensional layered paralell to the crystallographic (100) (Fig.2), and the shortest interlayer distance of La···La is 8.430 Å (calculated between the two lanthanum atom centres). This type of organic-inorganic layered structure has been reported of the lanthanide fumarates: [Ln2(fum)3(H2fum)(H2O)2 (Ln: Ce or Nd)] (Zhang et al., 2006). Finally, the two-dimensional layered structure is further constructed into a three-dimensional open framework by the ligands (Fig.3). The crystal is stabilized by hydrogen bond interactions between the coordinated water and carboxylate O atoms.