metal-organic compounds
Poly[μ2-aqua-μ4-naphthalene-1,8-dicarboxylato-manganese(II)]
aCollege of Chemistry and Life Science, Tianjin Normal University, Tianjin 300074, People's Republic of China
*Correspondence e-mail: hsxyzgy@mail.tjnu.edu.cn
The 12H6O4)(H2O)]n, contains one MnII ion, one 1,8-naphthalenedicarboxylate (1,8-NDC) ligand and one water molecule. The MnII ion is six-coordinated within a distorted octahedral coordination geometry, in which the equatorial sites are occupied by four carboxylate O atoms from four different 1,8-NDC ligands, while the axial positions are occupied by two O atoms of two coordinated water molecules. Adjacent MnII centres are bridged by one coordinated water and two carboxylate groups in a syn–syn mode to form infinite chains along the b axis, which are further cross-linked by the naphthalene spacers of the 1,8-NDC ligands to produce a two-dimensional extended network.
of the title complex, [Mn(CRelated literature
For general background, see: Chen et al. (2005). For related literature, see: Van der Ploeg et al. (1979); Hu et al. 2006.
Experimental
Crystal data
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Refinement
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Data collection: CrystalClear (Rigaku/MSC, 2005); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 1998); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536807063696/hk2400sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536807063696/hk2400Isup2.hkl
For the preparaton of the title complex, a mixture of MnCl2 (1 mmol), 1,8-naphthalenedicarboxylic acid (1 mmol), NaOH (2 mmol) and water (8 ml) in a teflon-lined stainless steel autoclave (15 ml) was kept at 423 K for 2 d. Colorless crystals were obtained after cooling to room temperature (yield; 30%). Anal. Calc. for C12H8MnO5: C 50.20, H 2.81%; Found: 50.56, H 2.52%.
H atom (for H2O) were located in a difference sythesis and refined isotropically [O—H = 0.89 (4) and 0.80 (4) Å, Uiso(H) = 0.055 (13) and 0.045 (12) Å2]. The remaining H atoms were positioned geometrically, with C—H = 0.93 Å for aromatic H, and constrained to ride on their parent atoms, with Uiso(H) = 1.2Ueq(C).
Aromatic carboxylic derivatives as versatile building blocks not only exhibit great potentials in constructing multi-dimensional networks, but also provide various advantages in producing magnetic molecular assemblies with variable size from discrete molecules to nanometer-scale aggregates and infinite solids (Chen et al., 2005). 1,8-Naphthalenedicarboxylate (1,8-NDC), a rigid multi- carboxylate ligand, is of special interest, since its multiple coordination sites, high symmetry and large conjugated structure can allow to construct molecular assemblies with novel structural motifs and physical properties. However, the metal complex of 1,8-NDC is rare so far (Van der Ploeg et al., 1979; Hu et al., 2006). We herein report the
of the title manganese complex, (I).The
of (I) contains one MnII ion, one 1,8-NDC ligand and one water molecule. The MnII ion is six-coordinated within a distorted octahedral coordination geometry. The equatorial sites are occupied by four carboxylate oxygen atoms from different 1,8-NDC ligands, while the axial positions are occupied by two water molecules. The Mn—O distances are within their normal ranges (Table 1). Adjacent MnII centers are bridged by two carboxylate groups and one coordination water to form an infinite one-dimensional chain running along the b axis, in which the carboxylate groups adopt syn-syn bidentate coordination mode (Fig. 2). The intrachain Mn···Mn distance is 3.614 Å. The one-dimensional chains are further cross-linked by the naphthalene spacers of 1,8-NDC to produce a two-dimensional extended network (Fig. 3).For general background, see: Chen et al. (2005). For related literature, see: Van der Ploeg et al. (1979); Hu et al. 2006.
Data collection: CrystalClear (Rigaku/MSC, 2005); cell
CrystalClear (Rigaku/MSC, 2005); data reduction: CrystalClear (Rigaku/MSC, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 1998); software used to prepare material for publication: SHELXTL (Bruker, 1998).Fig. 1. The molecular structure of the title molecule, with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level. [symmetry codes: (A) 2 - x, y - 1/2, 1/2 - z; (B) 2 - x, 1 - y,1 - z; (C) x, 1/2 - y, z - 1/2; (D) 2 - x, 1/2 + y, 1/2 - z]. | |
Fig. 2. A view of the one-dimensional chain in (I). | |
Fig. 3. The extended two-dimensional layer structure of (I). |
[Mn(C12H6O4)(H2O)] | F(000) = 580 |
Mr = 287.12 | Dx = 1.730 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 2641 reflections |
a = 15.720 (3) Å | θ = 3.1–27.5° |
b = 7.2167 (14) Å | µ = 1.21 mm−1 |
c = 9.837 (2) Å | T = 294 K |
β = 98.87 (3)° | Block, colourless |
V = 1102.6 (4) Å3 | 0.20 × 0.20 × 0.16 mm |
Z = 4 |
Rigaku R-AXIS RAPID-S diffractometer | 1945 independent reflections |
Radiation source: fine-focus sealed tube | 1632 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.058 |
ω scans | θmax = 25.0°, θmin = 3.1° |
Absorption correction: multi-scan (SADABS; Bruker, 1998) | h = −18→18 |
Tmin = 0.794, Tmax = 0.830 | k = −8→8 |
9056 measured reflections | l = −11→11 |
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)] = 0.040 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.089 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | w = 1/[σ2(Fo2) + (0.0445P)2] where P = (Fo2 + 2Fc2)/3 |
1945 reflections | (Δ/σ)max = 0.001 |
171 parameters | Δρmax = 0.85 e Å−3 |
0 restraints | Δρmin = −0.33 e Å−3 |
[Mn(C12H6O4)(H2O)] | V = 1102.6 (4) Å3 |
Mr = 287.12 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 15.720 (3) Å | µ = 1.21 mm−1 |
b = 7.2167 (14) Å | T = 294 K |
c = 9.837 (2) Å | 0.20 × 0.20 × 0.16 mm |
β = 98.87 (3)° |
Rigaku R-AXIS RAPID-S diffractometer | 1945 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 1998) | 1632 reflections with I > 2σ(I) |
Tmin = 0.794, Tmax = 0.830 | Rint = 0.058 |
9056 measured reflections |
R[F2 > 2σ(F2)] = 0.040 | 0 restraints |
wR(F2) = 0.089 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | Δρmax = 0.85 e Å−3 |
1945 reflections | Δρmin = −0.33 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 | ||
Mn1 | 0.99931 (3) | 0.10265 (5) | 0.25999 (4) | 0.01809 (16) | |
O1W | 0.99998 (17) | −0.1557 (3) | 0.3815 (2) | 0.0211 (5) | |
H1WA | 0.952 (3) | −0.169 (5) | 0.419 (4) | 0.055 (13)* | |
H1WB | 1.041 (3) | −0.170 (5) | 0.439 (4) | 0.045 (12)* | |
O1 | 0.90398 (13) | 0.2094 (3) | 0.3753 (2) | 0.0248 (5) | |
O2 | 0.89298 (12) | 0.5099 (3) | 0.3261 (2) | 0.0265 (5) | |
O3 | 1.09599 (13) | 0.2087 (3) | 0.4210 (2) | 0.0251 (5) | |
O4 | 0.89011 (12) | 0.0082 (3) | 0.1235 (2) | 0.0268 (5) | |
C1 | 0.86289 (19) | 0.3603 (4) | 0.3608 (3) | 0.0200 (6) | |
C2 | 0.76960 (19) | 0.3550 (4) | 0.3732 (3) | 0.0232 (7) | |
C3 | 0.7238 (2) | 0.2112 (5) | 0.3086 (4) | 0.0370 (9) | |
H3 | 0.7528 | 0.1119 | 0.2766 | 0.044* | |
C4 | 0.6336 (2) | 0.2110 (6) | 0.2897 (4) | 0.0509 (11) | |
H4 | 0.6032 | 0.1110 | 0.2469 | 0.061* | |
C5 | 0.5907 (2) | 0.3560 (6) | 0.3335 (4) | 0.0460 (10) | |
H5 | 0.5309 | 0.3571 | 0.3169 | 0.055* | |
C6 | 0.63495 (19) | 0.5047 (5) | 0.4034 (3) | 0.0334 (8) | |
C7 | 0.5903 (2) | 0.6559 (5) | 0.4497 (4) | 0.0437 (10) | |
H7 | 0.5305 | 0.6576 | 0.4323 | 0.052* | |
C8 | 0.6326 (2) | 0.7975 (6) | 0.5184 (4) | 0.0501 (10) | |
H8 | 0.6021 | 0.8983 | 0.5449 | 0.060* | |
C9 | 0.7223 (2) | 0.7935 (5) | 0.5499 (3) | 0.0368 (9) | |
H9 | 0.7508 | 0.8913 | 0.5990 | 0.044* | |
C10 | 0.7689 (2) | 0.6497 (4) | 0.5105 (3) | 0.0248 (7) | |
C11 | 1.13824 (19) | 0.3572 (4) | 0.4273 (3) | 0.0198 (6) | |
C12 | 0.72618 (18) | 0.5038 (4) | 0.4298 (3) | 0.0234 (7) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Mn1 | 0.0187 (3) | 0.0169 (2) | 0.0185 (3) | 0.00005 (19) | 0.00249 (17) | −0.00056 (18) |
O1W | 0.0221 (13) | 0.0214 (11) | 0.0194 (12) | 0.0009 (9) | 0.0017 (10) | 0.0025 (8) |
O1 | 0.0230 (12) | 0.0284 (12) | 0.0234 (12) | 0.0067 (10) | 0.0048 (9) | −0.0014 (9) |
O2 | 0.0246 (12) | 0.0283 (13) | 0.0282 (12) | −0.0030 (10) | 0.0091 (9) | 0.0008 (9) |
O3 | 0.0230 (12) | 0.0288 (12) | 0.0232 (12) | −0.0073 (10) | 0.0026 (9) | −0.0045 (9) |
O4 | 0.0240 (12) | 0.0282 (13) | 0.0264 (12) | −0.0009 (9) | −0.0023 (9) | −0.0033 (9) |
C1 | 0.0205 (17) | 0.0268 (17) | 0.0128 (14) | −0.0021 (13) | 0.0027 (11) | −0.0038 (12) |
C2 | 0.0192 (17) | 0.0269 (17) | 0.0234 (16) | −0.0011 (12) | 0.0029 (12) | −0.0009 (13) |
C3 | 0.027 (2) | 0.034 (2) | 0.050 (2) | −0.0056 (15) | 0.0051 (16) | −0.0138 (16) |
C4 | 0.029 (2) | 0.051 (3) | 0.070 (3) | −0.0170 (18) | −0.0015 (19) | −0.026 (2) |
C5 | 0.0181 (19) | 0.063 (3) | 0.055 (2) | −0.0063 (17) | 0.0005 (16) | −0.0129 (19) |
C6 | 0.0208 (19) | 0.044 (2) | 0.035 (2) | 0.0001 (15) | 0.0018 (14) | −0.0031 (16) |
C7 | 0.0168 (19) | 0.057 (3) | 0.056 (2) | 0.0107 (16) | 0.0010 (16) | −0.0082 (19) |
C8 | 0.031 (2) | 0.052 (3) | 0.067 (3) | 0.0167 (19) | 0.0066 (19) | −0.016 (2) |
C9 | 0.026 (2) | 0.037 (2) | 0.046 (2) | 0.0074 (15) | −0.0002 (15) | −0.0138 (16) |
C10 | 0.0203 (17) | 0.0282 (17) | 0.0251 (17) | 0.0016 (13) | 0.0010 (13) | 0.0008 (13) |
C11 | 0.0197 (16) | 0.0268 (17) | 0.0130 (14) | 0.0009 (13) | 0.0033 (11) | −0.0024 (12) |
C12 | 0.0200 (17) | 0.0252 (17) | 0.0245 (17) | −0.0003 (13) | 0.0017 (12) | 0.0010 (13) |
Mn1—O2i | 2.115 (2) | C6—C12 | 1.418 (4) |
Mn1—O4 | 2.122 (2) | C7—C8 | 1.343 (5) |
Mn1—O1 | 2.156 (2) | C7—H7 | 0.9300 |
Mn1—O3 | 2.159 (2) | C8—C9 | 1.396 (5) |
Mn1—O1W | 2.214 (2) | C8—H8 | 0.9300 |
Mn1—O1Wii | 2.232 (2) | C9—C10 | 1.362 (4) |
C1—O2 | 1.247 (3) | C9—H9 | 0.9300 |
C1—O1 | 1.262 (3) | C10—C12 | 1.423 (4) |
C1—C2 | 1.491 (4) | C10—C11iii | 1.494 (4) |
C2—C3 | 1.364 (4) | C11—O4ii | 1.252 (3) |
C2—C12 | 1.430 (4) | C11—O3 | 1.257 (3) |
C3—C4 | 1.401 (5) | C11—C10iii | 1.494 (4) |
C3—H3 | 0.9300 | O2—Mn1ii | 2.115 (2) |
C4—C5 | 1.350 (5) | O4—C11i | 1.252 (3) |
C4—H4 | 0.9300 | O1W—Mn1i | 2.232 (2) |
C5—C6 | 1.400 (5) | O1W—H1WA | 0.89 (4) |
C5—H5 | 0.9300 | O1W—H1WB | 0.80 (4) |
C6—C7 | 1.410 (5) | ||
O2i—Mn1—O4 | 105.32 (8) | C5—C6—C12 | 119.9 (3) |
O2i—Mn1—O1 | 171.04 (8) | C7—C6—C12 | 118.9 (3) |
O4—Mn1—O1 | 83.54 (8) | C8—C7—C6 | 121.3 (3) |
O2i—Mn1—O3 | 83.67 (8) | C8—C7—H7 | 119.4 |
O4—Mn1—O3 | 170.82 (8) | C6—C7—H7 | 119.4 |
O1—Mn1—O3 | 87.43 (8) | C7—C8—C9 | 120.0 (4) |
O2i—Mn1—O1W | 90.70 (9) | C7—C8—H8 | 120.0 |
O4—Mn1—O1W | 90.40 (9) | C9—C8—H8 | 120.0 |
O1—Mn1—O1W | 87.88 (9) | C10—C9—C8 | 121.5 (3) |
O3—Mn1—O1W | 87.61 (9) | C10—C9—H9 | 119.3 |
O2i—Mn1—O1Wii | 85.20 (9) | C8—C9—H9 | 119.3 |
O4—Mn1—O1Wii | 86.44 (9) | C9—C10—C12 | 119.6 (3) |
O1—Mn1—O1Wii | 96.86 (8) | C9—C10—C11iii | 116.3 (3) |
O3—Mn1—O1Wii | 96.31 (9) | C12—C10—C11iii | 123.4 (3) |
O1W—Mn1—O1Wii | 173.97 (6) | O4ii—C11—O3 | 124.7 (3) |
O2—C1—O1 | 124.6 (3) | O4ii—C11—C10iii | 117.3 (3) |
O2—C1—C2 | 117.6 (3) | O3—C11—C10iii | 117.8 (3) |
O1—C1—C2 | 117.5 (3) | C6—C12—C10 | 118.4 (3) |
C3—C2—C12 | 120.2 (3) | C6—C12—C2 | 117.5 (3) |
C3—C2—C1 | 115.9 (3) | C10—C12—C2 | 124.0 (3) |
C12—C2—C1 | 123.2 (3) | C1—O1—Mn1 | 129.36 (18) |
C2—C3—C4 | 120.9 (3) | C1—O2—Mn1ii | 138.1 (2) |
C2—C3—H3 | 119.6 | C11—O3—Mn1 | 130.17 (19) |
C4—C3—H3 | 119.6 | C11i—O4—Mn1 | 137.39 (19) |
C5—C4—C3 | 120.1 (3) | Mn1—O1W—Mn1i | 108.74 (9) |
C5—C4—H4 | 120.0 | Mn1—O1W—H1WA | 112 (2) |
C3—C4—H4 | 120.0 | Mn1i—O1W—H1WA | 105 (2) |
C4—C5—C6 | 121.1 (3) | Mn1—O1W—H1WB | 115 (3) |
C4—C5—H5 | 119.5 | Mn1i—O1W—H1WB | 105 (3) |
C6—C5—H5 | 119.5 | H1WA—O1W—H1WB | 110 (4) |
C5—C6—C7 | 121.2 (3) | ||
O2—C1—C2—C3 | 131.1 (3) | C1—C2—C12—C6 | 163.6 (3) |
O1—C1—C2—C3 | −43.2 (4) | C3—C2—C12—C10 | 173.6 (3) |
O2—C1—C2—C12 | −39.4 (4) | C1—C2—C12—C10 | −16.3 (5) |
O1—C1—C2—C12 | 146.3 (3) | O2—C1—O1—Mn1 | −35.5 (4) |
C12—C2—C3—C4 | 3.5 (5) | C2—C1—O1—Mn1 | 138.5 (2) |
C1—C2—C3—C4 | −167.3 (3) | O4—Mn1—O1—C1 | −84.6 (2) |
C2—C3—C4—C5 | 1.2 (6) | O3—Mn1—O1—C1 | 97.1 (2) |
C3—C4—C5—C6 | −2.8 (6) | O1W—Mn1—O1—C1 | −175.2 (2) |
C4—C5—C6—C7 | −179.8 (4) | O1Wii—Mn1—O1—C1 | 1.0 (3) |
C4—C5—C6—C12 | −0.4 (6) | O1—C1—O2—Mn1ii | 14.5 (5) |
C5—C6—C7—C8 | 179.1 (4) | C2—C1—O2—Mn1ii | −159.4 (2) |
C12—C6—C7—C8 | −0.3 (6) | O4ii—C11—O3—Mn1 | 34.3 (4) |
C6—C7—C8—C9 | −2.5 (6) | C10iii—C11—O3—Mn1 | −140.3 (2) |
C7—C8—C9—C10 | 1.2 (6) | O2i—Mn1—O3—C11 | 83.3 (2) |
C8—C9—C10—C12 | 2.9 (5) | O1—Mn1—O3—C11 | −97.7 (3) |
C8—C9—C10—C11iii | −168.6 (3) | O1W—Mn1—O3—C11 | 174.3 (3) |
C5—C6—C12—C10 | −175.1 (3) | O1Wii—Mn1—O3—C11 | −1.1 (3) |
C7—C6—C12—C10 | 4.3 (5) | O2i—Mn1—O4—C11i | 55.2 (3) |
C5—C6—C12—C2 | 4.9 (5) | O1—Mn1—O4—C11i | −123.4 (3) |
C7—C6—C12—C2 | −175.7 (3) | O1W—Mn1—O4—C11i | −35.6 (3) |
C9—C10—C12—C6 | −5.6 (5) | O1Wii—Mn1—O4—C11i | 139.2 (3) |
C11iii—C10—C12—C6 | 165.3 (3) | O2i—Mn1—O1W—Mn1i | −52.06 (11) |
C9—C10—C12—C2 | 174.4 (3) | O4—Mn1—O1W—Mn1i | 53.27 (11) |
C11iii—C10—C12—C2 | −14.7 (5) | O1—Mn1—O1W—Mn1i | 136.79 (11) |
C3—C2—C12—C6 | −6.5 (4) | O3—Mn1—O1W—Mn1i | −135.70 (11) |
Symmetry codes: (i) −x+2, y−1/2, −z+1/2; (ii) −x+2, y+1/2, −z+1/2; (iii) −x+2, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Mn(C12H6O4)(H2O)] |
Mr | 287.12 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 294 |
a, b, c (Å) | 15.720 (3), 7.2167 (14), 9.837 (2) |
β (°) | 98.87 (3) |
V (Å3) | 1102.6 (4) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 1.21 |
Crystal size (mm) | 0.20 × 0.20 × 0.16 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID-S |
Absorption correction | Multi-scan (SADABS; Bruker, 1998) |
Tmin, Tmax | 0.794, 0.830 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9056, 1945, 1632 |
Rint | 0.058 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.040, 0.089, 1.09 |
No. of reflections | 1945 |
No. of parameters | 171 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.85, −0.33 |
Computer programs: CrystalClear (Rigaku/MSC, 2005), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXTL (Bruker, 1998).
Mn1—O2i | 2.115 (2) | Mn1—O3 | 2.159 (2) |
Mn1—O4 | 2.122 (2) | Mn1—O1W | 2.214 (2) |
Mn1—O1 | 2.156 (2) | Mn1—O1Wii | 2.232 (2) |
O2i—Mn1—O4 | 105.32 (8) | O1—Mn1—O1W | 87.88 (9) |
O2i—Mn1—O1 | 171.04 (8) | O3—Mn1—O1W | 87.61 (9) |
O4—Mn1—O1 | 83.54 (8) | O2i—Mn1—O1Wii | 85.20 (9) |
O2i—Mn1—O3 | 83.67 (8) | O4—Mn1—O1Wii | 86.44 (9) |
O4—Mn1—O3 | 170.82 (8) | O1—Mn1—O1Wii | 96.86 (8) |
O1—Mn1—O3 | 87.43 (8) | O3—Mn1—O1Wii | 96.31 (9) |
O2i—Mn1—O1W | 90.70 (9) | O1W—Mn1—O1Wii | 173.97 (6) |
O4—Mn1—O1W | 90.40 (9) |
Symmetry codes: (i) −x+2, y−1/2, −z+1/2; (ii) −x+2, y+1/2, −z+1/2. |
Acknowledgements
The authors thank Tianjin Normal University for supporting this work.
References
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Aromatic carboxylic derivatives as versatile building blocks not only exhibit great potentials in constructing multi-dimensional networks, but also provide various advantages in producing magnetic molecular assemblies with variable size from discrete molecules to nanometer-scale aggregates and infinite solids (Chen et al., 2005). 1,8-Naphthalenedicarboxylate (1,8-NDC), a rigid multi- carboxylate ligand, is of special interest, since its multiple coordination sites, high symmetry and large conjugated structure can allow to construct molecular assemblies with novel structural motifs and physical properties. However, the metal complex of 1,8-NDC is rare so far (Van der Ploeg et al., 1979; Hu et al., 2006). We herein report the crystal structure of the title manganese complex, (I).
The asymmetric unit of (I) contains one MnII ion, one 1,8-NDC ligand and one water molecule. The MnII ion is six-coordinated within a distorted octahedral coordination geometry. The equatorial sites are occupied by four carboxylate oxygen atoms from different 1,8-NDC ligands, while the axial positions are occupied by two water molecules. The Mn—O distances are within their normal ranges (Table 1). Adjacent MnII centers are bridged by two carboxylate groups and one coordination water to form an infinite one-dimensional chain running along the b axis, in which the carboxylate groups adopt syn-syn bidentate coordination mode (Fig. 2). The intrachain Mn···Mn distance is 3.614 Å. The one-dimensional chains are further cross-linked by the naphthalene spacers of 1,8-NDC to produce a two-dimensional extended network (Fig. 3).