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Acta Cryst. (2007). E63, m2124-m2125    [ doi:10.1107/S1600536807032904 ]

Poly[[([mu]4-iminiodiacetato)bis([mu]3-iminodiacetato)lanthanum(III)nickel(II)] monohydrate]

X.-Y. Hu, Y.-P. Ren and S. W. Ng

Abstract top

The NiII atom in the title compound, {[LaNi(C4H5NO4)2(C4H6NO4)]·H2O}n is O,N,O'-chelated by two iminodiacetate dianions and it occupies a special position of site symmetry \overline{1}; the [Ni(C4H5NO4)2] unit functions as a [mu]2-bridge that links the [La(C4H6NO4)] units into a layer structure. The iminiodiacetate monoanion in the O,O'carboxyl-chelated [La(C4H6NO4)] unit lies about a special position of site symmetry 2; one of the two O atoms is also coordinated to another La atom. The rare-earth atom lies in a bicapped square-antiprismatic environment in the layer coordination polymer.

Comment top

The iminodiacetate [-O(O)CCH2NHCH2C(O)O-] dianion forms a large number of crystalline metal derivatives in which it O,N,O'-chelates to the metal. These studies have largely addressed compounds having one type of metal only; diaquadi(iminodiacetato)calciumcobalt tetrahydrate (Kuz'menko et al., 1992) and diaquadi(iminodiacetato)cadmiumcobalt (Long et al., 2003) represent unusual examples of heterometallic systems. The two compound adopt layer structures. A series of lanthanum/copper complexes is known that exhibit porosity; the three-dimensional network is also thermally stable when lattice molecules are removed (Ren et al., 2003a,b). Another series of lanthanum/copper complexes, [LnCu6(OH)3(C4H6NO4)2(C4H5NO4)4].(ClO4)2.25H2O, features antiferromagnetic Ln–Cu interactions as the rare earth atom is surrounded by six copper atoms at a distance of approximately 3.5 Å (Liu et al., 2003).

The present study extends an earlier study on a metal derivative of iminodiacetic acid that features both d- and f-block elements within the same framework. The hydrothermal reaction of lanthanum nitrate, nickel nitrate and iminodiacetic acid gave a gigantic metal cluster consisting of 20 lanthanum and 30 nickel atoms in the formula unit, [La20Ni30(C4H5NO4)30(CO3)6(NO3)6(OH)30(H2O)12](CO3)6.72H2O (Kong et al., 2007). Changing the lanthanum nitrate reactant to lanthanum chloride yielded the title compound, which has only one of each metal atom in formula unit. In [(C4H5NO4)2(C4H6NO4)LaNi.H2O]n (Fig. 1), two deprotonated iminodiacetate dianions each chelate to the nickel atom, the three chelating atoms occupying fac positions of the octahedral geometry of nickel, a feature that is also found in diaqua(iminodiacetato)nickel (Wu et al., 2003). Meanwhile, the iminodiacetate monoanion, which lies about a twofold rotation axis, O,O'-chelates to the water-coordinated lanthanum atom. One of the two oxygen atoms is additionally involved in bridging to another lanthanum atom, so that the geometry of the f-block metal is a ten-coordinate bicapped square antiprism (Fig. 2) in the layer structure. Hydrogen bonds link the layers into a three-dimensional network motif.

The somewhat uncommon iminodiacetate monoanion has also been found in other rare-earth complexes such as the neodymium (Albertsson & Oskarsson, 1968) praseodymium (Albertsson & Oskarsson, 1974; Li et al., 1999), uranium (Bombieri et al., 1974), yttrium (Li et al., 1997) and lanthanum complexes. The lanthanum complex is also a heterometallic compound having lanthanum and zinc bridged into a linear chain (Xu et al., 2004).

Related literature top

Heterometallic derivatives of iminodiacetic acid are exemplified by diaquabis(iminodiacetato)calciumcobalt tetrahydrate (Kuz'menko et al., 1992) and diaquabis(iminodiacetato)cadmiumcobalt (Long et al., 2003). For a lanthanum/zinc complex, see: Xu et al. (2004). For lanthanum/copper complexes, see: Ren et al. (2003a,b); Liu et al. (2003). For lanthanum/nickel complexes, see: Kong et al. (2007). For diaqua(iminodiacetato)nickel, see: Wu et al. (2003). For other lanthanum derivatives, see: Albertsson & Oskarsson (1968, 1974); Bombieri et al. (1974); Li et al. (1997, 1999).

Experimental top

Iminodiacetic acid (0.399 g, 3.0 mmol), nickel nitrate hexahydrate (0.436 g, 1.50 mmol) and lanthanum trichloride monohydrate (0.407 g, 1.0 mmol) were dissolved in water (15 ml). Aqueous sodium hydroxide (1 M) was added to the solution to a pH of approximately 5.5. The mixtue was placed din a 25-ml, Teflon-lined, stainless-steel Parr bomb. The bomb was heated to 453 K for 8 h. It was cooled to 373 K at 20 K h-1 and then kept at this temperature of 3 h before being allowed to cool to room temperate at 3 K h-1. Blue needle-shaped crystals were obtained in 70% yield (based on iminodiacetic acid. CH&N elemental analysis. Calc. for C12H18LaN3NiO13: Found: C 23.63, N 6.89, H, 2.97%. Found: C 23.45, N, 6.82, H 3.10%.

Refinement top

The water molecule was allowed to refine off the twofold rotation axis, and its anisotropic temperature factors were restrained to be nearly isotropic. An examination of hydrogen bonding interactions suggested that one of its H-atoms occupies the symmetry-related site of the water O-atom and would then not hydrogen bond to an acceptor. The other should be linked to an acceptor. The positions of the two were then set manually. The two H-atoms were not refined.

Carbon- and nitrogen-bound H-atoms were positioned geometrically (C–H 0.93 and 0.97 Å; N–H 0.88 Å), and were included in the refinement in the riding model approximation, with Uiso(H) = 1.2Ueq(C).

The final difference Fourier map had a large peak at 0.85 Å from La1 but was otherwise featureless.

Computing details top

Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2007).

Figures top
[Figure 1] Fig. 1. Thermal ellipsoid plot of a portion of the polymeric structure of [(C4H5NO4)2(C4H6NO4)LaNi.H2O]n; displacement ellipsoids are drawn at the 70% probability level, and hydrogen atoms as spheres of arbitrary radius. The water molecule is not shown. Symmetry codes: (i)1 - x, 1 - y, 2 - z; (ii) x, 1 - y, z - 1/2; (iii) 1 - x y, 3/2 - z; (iv) 1 - x, 1 - y, 1 - z; (v) x, 1 - y, 1/2 + z.
[Figure 2] Fig. 2. Bicapped square-antiprismatic geometry of lanthanum.
Poly[[(µ4-iminiodiacetato)bis(µ3-iminodiacetato)lanthanum(III)nickel(II)] monohydrate] top
Crystal data top
[LaNi(C4H5NO4)2(C4H6NO4)]·H2OF(000) = 1200
Mr = 609.91Dx = 2.250 Mg m−3
Monoclinic, C2/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2ycCell parameters from 6635 reflections
a = 9.7390 (4) Åθ = 2.5–28.3°
b = 23.859 (1) ŵ = 3.47 mm−1
c = 8.5312 (4) ÅT = 173 K
β = 114.732 (1)°Column, blue
V = 1800.5 (1) Å30.29 × 0.12 × 0.12 mm
Z = 4
Data collection top
Bruker APEX area-detector
diffractometer		2049 independent reflections
Radiation source: fine-focus sealed tube2046 reflections with I > 2σ(I)
graphiteRint = 0.020
φ and ω scansθmax = 27.5°, θmin = 1.7°
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)		h = −12→12
Tmin = 0.531, Tmax = 0.681k = −30→30
7464 measured reflectionsl = −11→11
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.024Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.062H-atom parameters constrained
S = 1.25 w = 1/[σ2(Fo2) + (0.025P)2 + 7.2608P]
where P = (Fo2 + 2Fc2)/3
2049 reflections(Δ/σ)max = 0.001
142 parametersΔρmax = 1.07 e Å−3
6 restraintsΔρmin = −0.59 e Å−3
Crystal data top
[LaNi(C4H5NO4)2(C4H6NO4)]·H2OV = 1800.5 (1) Å3
Mr = 609.91Z = 4
Monoclinic, C2/cMo Kα radiation
a = 9.7390 (4) ŵ = 3.47 mm−1
b = 23.859 (1) ÅT = 173 K
c = 8.5312 (4) Å0.29 × 0.12 × 0.12 mm
β = 114.732 (1)°
Data collection top
Bruker APEX area-detector
diffractometer		2049 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)		2046 reflections with I > 2σ(I)
Tmin = 0.531, Tmax = 0.681Rint = 0.020
7464 measured reflectionsθmax = 27.5°
Refinement top
R[F2 > 2σ(F2)] = 0.024H-atom parameters constrained
wR(F2) = 0.062Δρmax = 1.07 e Å−3
S = 1.25Δρmin = −0.59 e Å−3
2049 reflectionsAbsolute structure: ?
142 parametersFlack parameter: ?
6 restraintsRogers parameter: ?
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/UeqOcc. (<1)
La10.50000.506465 (9)0.75000.01011 (8)
Ni10.50000.66141 (2)0.75000.01438 (12)
O10.3730 (3)0.58240 (9)1.0855 (3)0.0192 (5)
O20.4288 (2)0.59806 (9)0.8602 (3)0.0160 (4)
O30.2951 (3)0.66506 (9)0.5435 (3)0.0201 (5)
O40.0546 (3)0.68604 (11)0.4774 (4)0.0313 (6)
O50.6443 (2)0.47668 (9)0.5902 (3)0.0148 (4)
O60.7921 (2)0.45955 (9)0.4593 (3)0.0175 (4)
O1w0.958 (3)0.4153 (7)0.255 (4)0.175 (8)0.50
H1w10.95720.43610.33810.262*0.50
H1w21.04100.41620.24360.262*0.50
N10.3913 (3)0.71032 (10)0.8677 (3)0.0166 (5)
H1n0.44190.74160.90680.020*
N21.00000.40180 (15)0.75000.0144 (7)
H2n10.96170.38000.65870.017*0.50
H2n21.03830.38000.84130.017*0.50
C10.3964 (3)0.61346 (12)0.9834 (4)0.0151 (5)
C20.3938 (4)0.67636 (13)1.0123 (4)0.0224 (7)
H2A0.30350.68551.03270.027*
H2B0.48420.68661.11760.027*
C30.2385 (4)0.72313 (14)0.7375 (4)0.0217 (6)
H3A0.23350.76330.70640.026*
H3B0.16520.71670.78830.026*
C40.1924 (4)0.68802 (13)0.5741 (4)0.0200 (6)
C50.7663 (3)0.45831 (12)0.5895 (4)0.0137 (5)
C60.8756 (3)0.43440 (13)0.7608 (4)0.0169 (6)
H6A0.91920.46560.84340.020*
H6B0.81910.41000.80700.020*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
La10.01116 (12)0.01078 (12)0.00888 (12)0.0000.00465 (9)0.000
Ni10.0187 (3)0.0133 (3)0.0114 (2)0.0000.0065 (2)0.000
O10.0244 (12)0.0185 (11)0.0194 (11)0.0046 (8)0.0137 (10)0.0052 (8)
O20.0205 (10)0.0138 (10)0.0156 (10)0.0006 (8)0.0096 (9)0.0005 (8)
O30.0241 (11)0.0190 (11)0.0139 (10)0.0018 (9)0.0048 (9)−0.0010 (8)
O40.0216 (12)0.0256 (13)0.0340 (14)0.0035 (10)−0.0008 (11)−0.0099 (11)
O50.0124 (9)0.0201 (10)0.0121 (9)0.0036 (8)0.0052 (8)0.0011 (8)
O60.0168 (10)0.0225 (11)0.0148 (10)0.0021 (8)0.0082 (8)0.0010 (8)
O1w0.169 (12)0.198 (11)0.168 (10)0.028 (8)0.082 (9)−0.011 (8)
N10.0220 (13)0.0115 (11)0.0160 (12)−0.0005 (9)0.0077 (11)−0.0004 (9)
N20.0115 (16)0.0148 (16)0.0150 (16)0.0000.0038 (13)0.000
C10.0139 (13)0.0169 (14)0.0119 (13)0.0022 (10)0.0029 (11)0.0008 (10)
C20.0375 (19)0.0163 (15)0.0182 (15)0.0020 (13)0.0165 (14)−0.0005 (12)
C30.0230 (16)0.0201 (15)0.0204 (15)0.0057 (12)0.0075 (13)−0.0019 (12)
C40.0248 (16)0.0136 (14)0.0177 (15)0.0015 (12)0.0052 (13)0.0012 (11)
C50.0130 (13)0.0129 (13)0.0145 (13)−0.0007 (10)0.0052 (11)−0.0004 (10)
C60.0119 (13)0.0242 (15)0.0154 (14)0.0047 (11)0.0065 (11)0.0040 (11)
Geometric parameters (Å, °) top
La1—O1i2.558 (2)O5—La1iv2.673 (2)
La1—O1ii2.558 (2)O6—C51.238 (4)
La1—O22.585 (2)O6—La1iv2.773 (2)
La1—O2iii2.585 (2)O1w—H1w10.87
La1—O52.438 (2)O1w—H1w20.856
La1—O5iii2.438 (2)N1—C21.468 (4)
La1—O5iv2.673 (2)N1—C31.469 (4)
La1—O5v2.673 (2)N1—H1n0.8800
La1—O6iv2.773 (2)N2—C61.475 (3)
La1—O6v2.773 (2)N2—C6vi1.475 (3)
Ni1—O22.048 (2)N2—H2n10.8800
Ni1—O2iii2.048 (2)N2—H2n20.8800
Ni1—O32.038 (2)C1—C21.523 (4)
Ni1—O3iii2.038 (2)C2—H2A0.9900
Ni1—N12.093 (3)C2—H2B0.9900
Ni1—N1iii2.093 (3)C3—C41.524 (4)
O1—C11.235 (4)C3—H3A0.9900
O1—La1i2.558 (2)C3—H3B0.9900
O2—C11.272 (4)C5—C61.514 (4)
O3—C41.260 (4)C6—H6A0.9900
O4—C41.248 (4)C6—H6B0.9900
O5—C51.269 (3)
O5iii—La1—O5146.10 (10)O3—Ni1—N1iii94.06 (10)
O5iii—La1—O1ii78.79 (7)O3iii—Ni1—N1iii83.21 (10)
O5—La1—O1ii73.20 (7)O2iii—Ni1—N1iii81.68 (9)
O5iii—La1—O1i73.20 (7)O2—Ni1—N1iii165.47 (9)
O5—La1—O1i78.79 (7)N1—Ni1—N1iii112.22 (14)
O1ii—La1—O1i68.03 (11)C1—O1—La1i134.0 (2)
O5iii—La1—O274.83 (7)C1—O2—Ni1114.52 (19)
O5—La1—O2138.99 (7)C1—O2—La1137.87 (19)
O1ii—La1—O2139.33 (7)Ni1—O2—La1105.28 (8)
O1i—La1—O2130.01 (7)C4—O3—Ni1114.5 (2)
O5iii—La1—O2iii138.99 (7)C5—O5—La1149.69 (19)
O5—La1—O2iii74.83 (7)C5—O5—La1iv96.62 (17)
O1ii—La1—O2iii130.01 (7)La1—O5—La1iv113.52 (8)
O1i—La1—O2iii139.33 (7)C5—O6—La1iv92.63 (17)
O2—La1—O2iii64.59 (9)H1w1—O1w—H1w2114
O5iii—La1—O5iv119.13 (8)C2—N1—C3113.9 (3)
O5—La1—O5iv66.48 (8)C2—N1—Ni1105.16 (18)
O1ii—La1—O5iv67.37 (7)C3—N1—Ni1108.01 (19)
O1i—La1—O5iv129.37 (7)C2—N1—H1n109.9
O2—La1—O5iv99.69 (6)C3—N1—H1n109.9
O2iii—La1—O5iv65.00 (7)Ni1—N1—H1n109.9
O5iii—La1—O5v66.48 (8)C6—N2—C6vi116.3 (3)
O5—La1—O5v119.13 (8)C6—N2—H2n1108.2
O1ii—La1—O5v129.37 (7)C6vi—N2—H2n1108.2
O1i—La1—O5v67.37 (7)C6—N2—H2n2108.2
O2—La1—O5v65.00 (7)C6vi—N2—H2n2108.2
O2iii—La1—O5v99.69 (7)H2n1—N2—H2n2107.4
O5iv—La1—O5v162.69 (9)O1—C1—O2126.3 (3)
O5iii—La1—O6v113.67 (6)O1—C1—C2117.2 (3)
O5—La1—O6v76.65 (7)O2—C1—C2116.4 (3)
O1ii—La1—O6v136.56 (7)N1—C2—C1113.8 (3)
O1i—La1—O6v76.04 (7)N1—C2—H2A108.8
O2—La1—O6v82.97 (7)C1—C2—H2A108.8
O2iii—La1—O6v68.16 (7)N1—C2—H2B108.8
O5iv—La1—O6v125.93 (6)C1—C2—H2B108.8
O5v—La1—O6v47.57 (6)H2A—C2—H2B107.7
O5iii—La1—O6iv76.65 (7)N1—C3—C4113.3 (3)
O5—La1—O6iv113.67 (6)N1—C3—H3A108.9
O1ii—La1—O6iv76.04 (7)C4—C3—H3A108.9
O1i—La1—O6iv136.56 (7)N1—C3—H3B108.9
O2—La1—O6iv68.16 (7)C4—C3—H3B108.9
O2iii—La1—O6iv82.97 (7)H3A—C3—H3B107.7
O5iv—La1—O6iv47.57 (6)O4—C4—O3125.0 (3)
O5v—La1—O6iv125.93 (6)O4—C4—C3116.7 (3)
O6v—La1—O6iv145.99 (9)O3—C4—C3118.2 (3)
O3—Ni1—O3iii175.11 (13)O6—C5—O5122.5 (3)
O3—Ni1—O2iii91.83 (9)O6—C5—C6123.4 (3)
O3iii—Ni1—O2iii91.78 (9)O5—C5—C6114.1 (2)
O3—Ni1—O291.78 (9)N2—C6—C5113.8 (2)
O3iii—Ni1—O291.83 (9)N2—C6—H6A108.8
O2iii—Ni1—O284.85 (12)C5—C6—H6A108.8
O3—Ni1—N183.21 (10)N2—C6—H6B108.8
O3iii—Ni1—N194.06 (10)C5—C6—H6B108.8
O2iii—Ni1—N1165.47 (10)H6A—C6—H6B107.7
O2—Ni1—N181.68 (9)
O3—Ni1—O2—C1−102.5 (2)O1ii—La1—O5—La1iv72.12 (9)
O3iii—Ni1—O2—C174.2 (2)O1i—La1—O5—La1iv142.32 (10)
O2iii—Ni1—O2—C1165.8 (2)O2—La1—O5—La1iv−77.24 (12)
N1—Ni1—O2—C1−19.6 (2)O2iii—La1—O5—La1iv−68.93 (8)
N1iii—Ni1—O2—C1143.8 (3)O5iv—La1—O5—La1iv0.0
O3—Ni1—O2—La191.68 (9)O5v—La1—O5—La1iv−161.70 (9)
O3iii—Ni1—O2—La1−91.62 (9)O6v—La1—O5—La1iv−139.55 (9)
O2iii—Ni1—O2—La10.0O6iv—La1—O5—La1iv6.16 (11)
N1—Ni1—O2—La1174.55 (10)O3—Ni1—N1—C2117.8 (2)
N1iii—Ni1—O2—La1−22.0 (4)O3iii—Ni1—N1—C2−66.3 (2)
O5iii—La1—O2—C125.4 (3)O2iii—Ni1—N1—C247.2 (5)
O5—La1—O2—C1−151.7 (3)O2—Ni1—N1—C225.0 (2)
O1ii—La1—O2—C176.8 (3)N1iii—Ni1—N1—C2−150.6 (2)
O1i—La1—O2—C1−26.4 (3)O3—Ni1—N1—C3−4.2 (2)
O2iii—La1—O2—C1−160.6 (3)O3iii—Ni1—N1—C3171.7 (2)
O5iv—La1—O2—C1143.2 (3)O2iii—Ni1—N1—C3−74.9 (4)
O5v—La1—O2—C1−45.3 (3)O2—Ni1—N1—C3−97.0 (2)
O6v—La1—O2—C1−91.5 (3)N1iii—Ni1—N1—C387.4 (2)
O6iv—La1—O2—C1106.9 (3)La1i—O1—C1—O242.4 (5)
O5iii—La1—O2—Ni1−173.97 (10)La1i—O1—C1—C2−134.4 (3)
O5—La1—O2—Ni18.89 (15)Ni1—O2—C1—O1−168.5 (2)
O1ii—La1—O2—Ni1−122.63 (10)La1—O2—C1—O1−9.1 (5)
O1i—La1—O2—Ni1134.23 (9)Ni1—O2—C1—C28.3 (3)
O2iii—La1—O2—Ni10.0La1—O2—C1—C2167.7 (2)
O5iv—La1—O2—Ni1−56.24 (9)C3—N1—C2—C189.9 (3)
O5v—La1—O2—Ni1115.28 (10)Ni1—N1—C2—C1−28.2 (3)
O6v—La1—O2—Ni169.12 (9)O1—C1—C2—N1−168.1 (3)
O6iv—La1—O2—Ni1−92.54 (9)O2—C1—C2—N114.7 (4)
O2iii—Ni1—O3—C4159.8 (2)C2—N1—C3—C4−103.8 (3)
O2—Ni1—O3—C474.9 (2)Ni1—N1—C3—C412.7 (3)
N1—Ni1—O3—C4−6.5 (2)Ni1—O3—C4—O4−166.8 (3)
N1iii—Ni1—O3—C4−118.5 (2)Ni1—O3—C4—C316.0 (4)
O5iii—La1—O5—C5−78.8 (4)N1—C3—C4—O4162.7 (3)
O1ii—La1—O5—C5−114.4 (4)N1—C3—C4—O3−19.9 (4)
O1i—La1—O5—C5−44.2 (4)La1iv—O6—C5—O5−8.2 (3)
O2—La1—O5—C596.2 (4)La1iv—O6—C5—C6171.1 (3)
O2iii—La1—O5—C5104.6 (4)La1—O5—C5—O6−165.4 (3)
O5iv—La1—O5—C5173.5 (4)La1iv—O5—C5—O68.6 (3)
O5v—La1—O5—C511.8 (4)La1—O5—C5—C615.2 (5)
O6v—La1—O5—C533.9 (4)La1iv—O5—C5—C6−170.8 (2)
O6iv—La1—O5—C5179.6 (4)C6vi—N2—C6—C577.8 (2)
C5v—La1—O5—C525.2 (4)O6—C5—C6—N2−12.6 (4)
C5iv—La1—O5—C5174.8 (3)O5—C5—C6—N2166.8 (3)
O5iii—La1—O5—La1iv107.71 (8)
Symmetry codes: (i) −x+1, −y+1, −z+2; (ii) x, −y+1, z−1/2; (iii) −x+1, y, −z+3/2; (iv) −x+1, −y+1, −z+1; (v) x, −y+1, z+1/2; (vi) −x+2, y, −z+3/2.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N1—H1n···O4vii0.882.002.877 (4)176
N2—H2n1···O4iv0.881.922.752 (4)156
N2—H2n2···O4viii0.881.922.752 (4)156
O1w—H1w1···O60.872.313.01 (2)138
Symmetry codes: (vii) x+1/2, −y+3/2, z+1/2; (iv) −x+1, −y+1, −z+1; (viii) x+1, −y+1, z+1/2.
Table 1
Selected geometric parameters (Å) top
La1—O1i2.558 (2)La1—O5v2.673 (2)
La1—O1ii2.558 (2)La1—O6iv2.773 (2)
La1—O22.585 (2)La1—O6v2.773 (2)
La1—O2iii2.585 (2)Ni1—O22.048 (2)
La1—O52.438 (2)Ni1—O32.038 (2)
La1—O5iii2.438 (2)Ni1—N12.093 (3)
La1—O5iv2.673 (2)
Symmetry codes: (i) −x+1, −y+1, −z+2; (ii) x, −y+1, z−1/2; (iii) −x+1, y, −z+3/2; (iv) −x+1, −y+1, −z+1; (v) x, −y+1, z+1/2.
Acknowledgements top

We thank Xiamen University and the University of Malaya for supporting this work.

references
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