metal-organic compounds
catena-Poly[[[tetraaqualanthanum(III)]-di-μ-isonicotinato-κ4O:O′] chloride]
aDepartment of Chemical and Life Science, Baise University, Baise 533000, People's Republic of China
*Correspondence e-mail: ben19812006@163.com
In the title compound, {[La(C6H4NO2)2(H2O)4]Cl}n, the LaIII atom lies on a twofold rotation axis and is eight-coordinated by four O atoms from four isonicotinate ligands and four water molecules in a distorted square-antiprismatic coodination environment. Adjacent LaIII atoms are bridged by two carboxylate groups from two isonicotinate ligands, forming an extended chain along [001]. These chains are linked through O—H⋯N hydrogen bonds into a three-dimensional network with channels in which the chloride anions form O—H⋯Cl hydrogen bonds. Intrachain O—H⋯O hydrogen bonds and π–π interactions [centroid–centroid distance = 3.908 (2) Å] are also observed.
Related literature
For lanthanide complexes with nicotinic acid, isonicotinic acid and isonicotinic acid N-oxide ligands, see: Cai et al. (2003); Chen & Fukuzumi (2009); Cui et al. (1999); Kay et al. (1972); Ma et al. (1996, 1999); Mao et al. (1998); Starynowicz (1991, 1993); Wu et al. (2008); Zeng et al. (2000); Zhang et al. (1999).
Experimental
Crystal data
|
Refinement
|
Data collection: SMART (Bruker, 2007); cell SAINT (Bruker, 2007); 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, 1999); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).
Supporting information
https://doi.org/10.1107/S1600536812027778/hy2530sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812027778/hy2530Isup2.hkl
LaCl3.7H2O (0.3174 g, 1 mmol), isonicotinic acid (0.2442 g, 2 mmol), NaOH (0.08 g, 2 mmol) were added to a mixture of water (15 ml) and ethanol (10 ml). The resulting mixture was stirred at 423 K for 4 h and filtered off. The filtrate was allowed to stand at room temperature and slow evaporation afforded colorless block crystals of the title complex (yield: 65%). Analysis, calculated for C12H16ClLaN2O8: C 29.38, N 5.71, H 3.29%; found: C 29.36, N 5.74, H 3.28%.
H atoms on C atoms were positioned geometrically and refined as riding atoms, with C—H = 0.93 Å and Uiso(H) = 1.2Ueq(C). The water H atoms were located in difference Fourier maps and refined using a riding model, with O—H = 0.85 Å and Uiso(H) = 1.2Ueq(O).
Much attention has been devoted to the research on lanthanide metal polynuclear compounds because of their magnetic and luminescent properties. Most of these types of compounds were synthesized by the reaction of rare-earth metal ions with bi- or multi-dentate ligands such as nicotinic acid (Kay et al., 1972; Ma, Hu et al., 1996; Starynowicz, 1991, 1993), isonicotinic acid (Chen & Fukuzumi, 2009; Ma, Evans et al., 1999; Wu et al., 2008; Zeng et al., 2000) and isonicotinic acid N-oxide (Mao et al., 1998). In the course of research in this area, our extended group has reported several such compounds with different bridging ligands (Cai et al., 2003; Cui et al., 1999; Zhang et al., 1999). Herein, we report the synthesis and
of a new lanthanum complex with isonicotinic ligand.The title compound contains extended [La(C6H4NO2)2(H2O)4]n cationic chains and Cl- anions. The LaIII ion, lying on a twofold rotation axis, is eight-coordinated by four O atoms belonging to four different isonicotinic ligands [average La—O = 2.451 (3) Å] and four water molecules [average La—O = 2.563 (3) Å] (Fig. 1). The coordination geometry of the LaIII ion is best described as slightly distorted square-antiprismatic. The La atoms are bridged each other by two syn-syn µ-O:O'-carboxylate groups of the isonicotinic ligands, forming an extended chain along [0 0 1]. This geometry is similar to that found in [Eu(L)2(H2O)4]n.nH2O (L = isonicotinic acid N-oxide) (Mao et al., 1998) and [La(C6H4NO2)2(H2O)4](NO3) (Cai et al., 2003), but differs from those found in Ln(isonicotinate)3(H2O)2 (Ln = Ce, Pr, Nd, Sm, Eu, Tb) (Ma, Evans et al., 1999), in which the LnIII atoms are bridged by four syn-syn µ-O:O'-carboxylate groups of the isonicotinic ligands (Ln = Ce, Pr, Nd) or coordinated by both two syn-syn µ-O:O'-carboxylate groups and chelating carboxylate groups of the isonicotinic ligands (Ln = Sm, Eu, Tb). To the best of our knowledge, the arrangement in the present complex is rare in the lanthanide analogs.
There are three kinds of hydrogen bonds, O—H···Cl, O—H···O and O—H···N (Table 1). Interchain O—H···N hydrogen bonds between the coordinated water molecules and uncoordinated N atoms of the isonicotinate ligands link the cationic chains into a three-dimensional network with channels along [0 0 1], in which the chloride anions are located, as shown in Fig. 2, forming O—H···Cl hydrogen bonds. Intrachain O—H···O hydrogen bonds are also present. π–π stacking interactions exist between two adjacent isonicotinate ligands located in a same chain [centroid–centroid distance = 3.908 (2) Å].
For lanthanide complexes with nicotinic acid, isonicotinic acid and isonicotinic acid N-oxide ligands, see: Cai et al. (2003); Chen & Fukuzumi (2009); Cui et al. (1999); Kay et al. (1972); Ma, Evans et al. (1999); Ma, Hu et al. (1996); Mao et al. (1998); Starynowicz (1991, 1993); Wu et al. (2008); Zeng et al. (2000); Zhang et al. (1999).
Data collection: SMART (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).[La(C6H4NO2)2(H2O)4]Cl | F(000) = 960 |
Mr = 490.63 | Dx = 1.780 Mg m−3 |
Orthorhombic, Pbcn | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2n 2ab | Cell parameters from 3778 reflections |
a = 8.987 (3) Å | θ = 2.5–28.3° |
b = 19.769 (3) Å | µ = 2.52 mm−1 |
c = 10.305 (3) Å | T = 296 K |
V = 1830.8 (9) Å3 | Block, colorless |
Z = 4 | 0.36 × 0.34 × 0.32 mm |
Bruker SMART 1000 CCD diffractometer | 1652 independent reflections |
Radiation source: fine-focus sealed tube | 1442 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.029 |
φ and ω scans | θmax = 25.2°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −10→10 |
Tmin = 0.464, Tmax = 0.500 | k = −13→23 |
9336 measured reflections | l = −12→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)] = 0.025 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.058 | H-atom parameters constrained |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0232P)2 + 2.6828P] where P = (Fo2 + 2Fc2)/3 |
1652 reflections | (Δ/σ)max = 0.001 |
110 parameters | Δρmax = 0.46 e Å−3 |
0 restraints | Δρmin = −0.83 e Å−3 |
[La(C6H4NO2)2(H2O)4]Cl | V = 1830.8 (9) Å3 |
Mr = 490.63 | Z = 4 |
Orthorhombic, Pbcn | Mo Kα radiation |
a = 8.987 (3) Å | µ = 2.52 mm−1 |
b = 19.769 (3) Å | T = 296 K |
c = 10.305 (3) Å | 0.36 × 0.34 × 0.32 mm |
Bruker SMART 1000 CCD diffractometer | 1652 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 1442 reflections with I > 2σ(I) |
Tmin = 0.464, Tmax = 0.500 | Rint = 0.029 |
9336 measured reflections |
R[F2 > 2σ(F2)] = 0.025 | 0 restraints |
wR(F2) = 0.058 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.46 e Å−3 |
1652 reflections | Δρmin = −0.83 e Å−3 |
110 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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 | ||
O2 | 0.9557 (3) | 0.89408 (12) | −0.0984 (2) | 0.0408 (6) | |
La1 | 1.0000 | 1.011578 (11) | 0.2500 | 0.02190 (10) | |
O1 | 0.8975 (3) | 0.92871 (11) | 0.1000 (2) | 0.0377 (5) | |
O3 | 1.2552 (2) | 1.04958 (10) | 0.3400 (2) | 0.0352 (5) | |
H3A | 1.2917 | 1.0890 | 0.3483 | 0.042* | |
H3B | 1.3240 | 1.0228 | 0.3163 | 0.042* | |
C1 | 0.8975 (3) | 0.81153 (15) | 0.0573 (3) | 0.0260 (6) | |
C2 | 0.8242 (4) | 0.79557 (17) | 0.1717 (3) | 0.0374 (8) | |
H2 | 0.7884 | 0.8293 | 0.2262 | 0.045* | |
O4 | 0.7951 (3) | 0.95919 (14) | 0.3865 (2) | 0.0473 (6) | |
H4C | 0.7803 | 0.9566 | 0.4678 | 0.057* | |
H4D | 0.7123 | 0.9541 | 0.3480 | 0.057* | |
C3 | 0.9497 (4) | 0.75920 (16) | −0.0183 (3) | 0.0366 (8) | |
H3 | 1.0001 | 0.7681 | −0.0952 | 0.044* | |
N1 | 0.8541 (3) | 0.67750 (15) | 0.1297 (3) | 0.0466 (8) | |
C5 | 0.9265 (5) | 0.69354 (18) | 0.0216 (4) | 0.0500 (10) | |
H5 | 0.9633 | 0.6587 | −0.0297 | 0.060* | |
C6 | 0.8060 (5) | 0.7282 (2) | 0.2023 (4) | 0.0485 (9) | |
H6 | 0.7567 | 0.7176 | 0.2790 | 0.058* | |
C7 | 0.9186 (3) | 0.88401 (15) | 0.0168 (3) | 0.0270 (7) | |
Cl1 | 0.5000 | 0.94091 (8) | 0.2500 | 0.0543 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O2 | 0.0554 (15) | 0.0312 (12) | 0.0358 (13) | −0.0011 (11) | 0.0088 (11) | 0.0112 (10) |
La1 | 0.02877 (15) | 0.01764 (15) | 0.01929 (14) | 0.000 | −0.00134 (9) | 0.000 |
O1 | 0.0418 (13) | 0.0273 (12) | 0.0441 (13) | −0.0027 (10) | −0.0035 (11) | −0.0106 (10) |
O3 | 0.0358 (12) | 0.0247 (11) | 0.0450 (12) | −0.0076 (9) | 0.0005 (10) | −0.0071 (10) |
C1 | 0.0297 (16) | 0.0252 (16) | 0.0232 (14) | −0.0039 (13) | −0.0028 (12) | 0.0002 (12) |
C2 | 0.048 (2) | 0.0331 (18) | 0.0316 (17) | −0.0037 (15) | 0.0086 (15) | 0.0009 (14) |
O4 | 0.0318 (13) | 0.0836 (19) | 0.0265 (11) | −0.0182 (12) | −0.0036 (9) | 0.0118 (12) |
C3 | 0.050 (2) | 0.0280 (17) | 0.0322 (17) | −0.0020 (15) | 0.0090 (15) | 0.0005 (14) |
N1 | 0.0507 (19) | 0.0318 (16) | 0.057 (2) | −0.0095 (14) | 0.0008 (16) | 0.0117 (15) |
C5 | 0.067 (3) | 0.0247 (18) | 0.058 (2) | −0.0007 (19) | 0.007 (2) | −0.0048 (17) |
C6 | 0.053 (2) | 0.047 (2) | 0.045 (2) | −0.0104 (18) | 0.0123 (19) | 0.0156 (18) |
C7 | 0.0253 (17) | 0.0245 (16) | 0.0312 (16) | −0.0026 (13) | −0.0032 (13) | 0.0012 (13) |
Cl1 | 0.0349 (7) | 0.0595 (9) | 0.0687 (9) | 0.000 | −0.0172 (6) | 0.000 |
O2—C7 | 1.249 (4) | C2—C6 | 1.379 (5) |
La1—O1 | 2.433 (2) | C2—H2 | 0.9300 |
La1—O2i | 2.465 (2) | O4—H4C | 0.8500 |
La1—O4 | 2.538 (2) | O4—H4D | 0.8500 |
La1—O3 | 2.585 (2) | C3—C5 | 1.378 (5) |
O1—C7 | 1.246 (4) | C3—H3 | 0.9300 |
O3—H3A | 0.8500 | N1—C6 | 1.323 (5) |
O3—H3B | 0.8500 | N1—C5 | 1.328 (5) |
C1—C3 | 1.377 (4) | C5—H5 | 0.9300 |
C1—C2 | 1.387 (4) | C6—H6 | 0.9300 |
C1—C7 | 1.504 (4) | ||
C7—O2—La1ii | 140.0 (2) | O3—La1—O3iii | 146.21 (10) |
O1—La1—O1iii | 95.35 (11) | C7—O1—La1 | 149.0 (2) |
O1—La1—O2i | 148.28 (8) | La1—O3—H3A | 130.2 |
O1iii—La1—O2i | 99.69 (8) | La1—O3—H3B | 111.2 |
O1—La1—O2ii | 99.69 (8) | H3A—O3—H3B | 108.5 |
O1iii—La1—O2ii | 148.28 (8) | C3—C1—C2 | 118.1 (3) |
O2i—La1—O2ii | 81.66 (11) | C3—C1—C7 | 121.0 (3) |
O1—La1—O4 | 78.60 (8) | C2—C1—C7 | 120.8 (3) |
O1iii—La1—O4 | 69.39 (8) | C6—C2—C1 | 118.1 (3) |
O2i—La1—O4 | 80.82 (8) | C6—C2—H2 | 121.0 |
O2ii—La1—O4 | 141.00 (8) | C1—C2—H2 | 121.0 |
O1—La1—O4iii | 69.39 (8) | La1—O4—H4C | 133.2 |
O1iii—La1—O4iii | 78.60 (8) | La1—O4—H4D | 115.2 |
O2i—La1—O4iii | 141.00 (8) | H4C—O4—H4D | 108.4 |
O2ii—La1—O4iii | 80.82 (8) | C1—C3—C5 | 119.2 (3) |
O4—La1—O4iii | 131.82 (13) | C1—C3—H3 | 120.4 |
O1—La1—O3 | 139.41 (7) | C5—C3—H3 | 120.4 |
O1iii—La1—O3 | 68.40 (7) | C6—N1—C5 | 117.0 (3) |
O2i—La1—O3 | 72.31 (8) | N1—C5—C3 | 123.4 (3) |
O2ii—La1—O3 | 82.19 (8) | N1—C5—H5 | 118.3 |
O4—La1—O3 | 124.28 (7) | C3—C5—H5 | 118.3 |
O4iii—La1—O3 | 70.97 (7) | N1—C6—C2 | 124.3 (3) |
O1—La1—O3iii | 68.40 (7) | N1—C6—H6 | 117.8 |
O1iii—La1—O3iii | 139.41 (7) | C2—C6—H6 | 117.8 |
O2i—La1—O3iii | 82.19 (8) | O1—C7—O2 | 125.6 (3) |
O2ii—La1—O3iii | 72.31 (8) | O1—C7—C1 | 117.7 (3) |
O4—La1—O3iii | 70.97 (7) | O2—C7—C1 | 116.7 (3) |
O4iii—La1—O3iii | 124.28 (7) |
Symmetry codes: (i) x, −y+2, z+1/2; (ii) −x+2, −y+2, −z; (iii) −x+2, y, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3A···N1iv | 0.85 | 1.85 | 2.699 (4) | 175 |
O3—H3B···Cl1v | 0.85 | 2.36 | 3.212 (2) | 175 |
O4—H4C···O3vi | 0.85 | 2.01 | 2.860 (3) | 180 |
O4—H4D···Cl1 | 0.85 | 2.17 | 3.024 (3) | 180 |
Symmetry codes: (iv) x+1/2, y+1/2, −z+1/2; (v) x+1, y, z; (vi) −x+2, −y+2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [La(C6H4NO2)2(H2O)4]Cl |
Mr | 490.63 |
Crystal system, space group | Orthorhombic, Pbcn |
Temperature (K) | 296 |
a, b, c (Å) | 8.987 (3), 19.769 (3), 10.305 (3) |
V (Å3) | 1830.8 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.52 |
Crystal size (mm) | 0.36 × 0.34 × 0.32 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.464, 0.500 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9336, 1652, 1442 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.599 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.025, 0.058, 1.07 |
No. of reflections | 1652 |
No. of parameters | 110 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.46, −0.83 |
Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 1999), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3A···N1i | 0.85 | 1.85 | 2.699 (4) | 175 |
O3—H3B···Cl1ii | 0.85 | 2.36 | 3.212 (2) | 175 |
O4—H4C···O3iii | 0.85 | 2.01 | 2.860 (3) | 180 |
O4—H4D···Cl1 | 0.85 | 2.17 | 3.024 (3) | 180 |
Symmetry codes: (i) x+1/2, y+1/2, −z+1/2; (ii) x+1, y, z; (iii) −x+2, −y+2, −z+1. |
References
Brandenburg, K. (1999). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Bruker (2007). SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Cai, L.-Z., Wang, M.-S., Zhou, G.-W., Guo, G.-C., Mao, J.-G. & Huang, J.-S. (2003). Acta Cryst. E59, m249–m251. Web of Science CSD CrossRef IUCr Journals Google Scholar
Chen, W.-T. & Fukuzumi, S. (2009). Inorg. Chem. 48, 3800–3807. Web of Science CSD CrossRef PubMed CAS Google Scholar
Cui, Y., Zheng, F.-K. & Huang, J.-S. (1999). Chem. Lett. pp. 281–282. CSD CrossRef Google Scholar
Kay, J., Moore, J. W. & Glick, M. D. (1972). Inorg. Chem. 11, 2818–2827. CSD CrossRef CAS Web of Science Google Scholar
Ma, L., Evans, O. R., Foxman, B. M. & Lin, W. B. (1999). Inorg. Chem. 38, 5837–5840. Web of Science CSD CrossRef CAS Google Scholar
Ma, J.-F., Hu, N.-H. & Ni, J.-Z. (1996). Polyhedron, 15, 1797–1799. Google Scholar
Mao, J.-G., Zhang, H.-J., Ni, J.-Z., Wang, S.-B. & Mak, T. C. W. (1998). J. Chem. Crystallogr. 17, 3999–4009. CAS Google Scholar
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Starynowicz, P. (1991). Acta Cryst. C47, 294–297. CSD CrossRef CAS Web of Science IUCr Journals Google Scholar
Starynowicz, P. (1993). Acta Cryst. C49, 1895–1897. CSD CrossRef CAS Web of Science IUCr Journals Google Scholar
Wu, K.-J., Cai, L.-Z., Xu, G., Zhou, G.-W. & Guo, G.-C. (2008). Acta Cryst. E64, m56. Web of Science CSD CrossRef IUCr Journals Google Scholar
Zeng, X.-R., Xu, Y., Xiong, R.-G., Zhang, L.-J. & You, X.-Z. (2000). Acta Cryst. C56, e325–e326. CSD CrossRef CAS IUCr Journals Google Scholar
Zhang, X., Cui, Y., Zheng, F.-K. & Huang, J.-S. (1999). Chem. Lett. pp. 1111–1112. Web of Science CSD CrossRef Google Scholar
This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Much attention has been devoted to the research on lanthanide metal polynuclear compounds because of their magnetic and luminescent properties. Most of these types of compounds were synthesized by the reaction of rare-earth metal ions with bi- or multi-dentate ligands such as nicotinic acid (Kay et al., 1972; Ma, Hu et al., 1996; Starynowicz, 1991, 1993), isonicotinic acid (Chen & Fukuzumi, 2009; Ma, Evans et al., 1999; Wu et al., 2008; Zeng et al., 2000) and isonicotinic acid N-oxide (Mao et al., 1998). In the course of research in this area, our extended group has reported several such compounds with different bridging ligands (Cai et al., 2003; Cui et al., 1999; Zhang et al., 1999). Herein, we report the synthesis and crystal structure of a new lanthanum complex with isonicotinic ligand.
The title compound contains extended [La(C6H4NO2)2(H2O)4]n cationic chains and Cl- anions. The LaIII ion, lying on a twofold rotation axis, is eight-coordinated by four O atoms belonging to four different isonicotinic ligands [average La—O = 2.451 (3) Å] and four water molecules [average La—O = 2.563 (3) Å] (Fig. 1). The coordination geometry of the LaIII ion is best described as slightly distorted square-antiprismatic. The La atoms are bridged each other by two syn-syn µ-O:O'-carboxylate groups of the isonicotinic ligands, forming an extended chain along [0 0 1]. This geometry is similar to that found in [Eu(L)2(H2O)4]n.nH2O (L = isonicotinic acid N-oxide) (Mao et al., 1998) and [La(C6H4NO2)2(H2O)4](NO3) (Cai et al., 2003), but differs from those found in Ln(isonicotinate)3(H2O)2 (Ln = Ce, Pr, Nd, Sm, Eu, Tb) (Ma, Evans et al., 1999), in which the LnIII atoms are bridged by four syn-syn µ-O:O'-carboxylate groups of the isonicotinic ligands (Ln = Ce, Pr, Nd) or coordinated by both two syn-syn µ-O:O'-carboxylate groups and chelating carboxylate groups of the isonicotinic ligands (Ln = Sm, Eu, Tb). To the best of our knowledge, the arrangement in the present complex is rare in the lanthanide analogs.
There are three kinds of hydrogen bonds, O—H···Cl, O—H···O and O—H···N (Table 1). Interchain O—H···N hydrogen bonds between the coordinated water molecules and uncoordinated N atoms of the isonicotinate ligands link the cationic chains into a three-dimensional network with channels along [0 0 1], in which the chloride anions are located, as shown in Fig. 2, forming O—H···Cl hydrogen bonds. Intrachain O—H···O hydrogen bonds are also present. π–π stacking interactions exist between two adjacent isonicotinate ligands located in a same chain [centroid–centroid distance = 3.908 (2) Å].