A two-dimensional calcium (II) coordination polymer constructed from 2,2′-[tereph­thal­oyl­bis(aza­nedi­yl)]di­acetate: synthesis, structure and properties

Liu, H.-H.; Liang, C.-H.; Liu, Y.; Zhang, H.-T.

doi:10.1107/S205322962101041X

A two-dimensional calcium (II) coordination polymer constructed from 2,2′-[terephthaloylbis(azanediyl)]diacetate: synthesis, structure and properties

H.-H. Liu, C.-H. Liang, Y. Liu and H.-T. Zhang

A new two-dimensional (2D) coordination polymer, namely, poly[[diaqua-[μ₄-2,2′-[terephthaloylbis(azanediyl)]diacetato]calcium(II)] monohydrate], {[Ca(C₁₂H₁₀N₂O₆)(H₂O)₂]·H₂O}_n, (I), has been synthesized by the reaction of CaCl₂ with 2,2′-[terephthaloylbis(azanediyl)]diacetic acid (H₂L). The title compound was structurally characterized by single-crystal X-ray diffraction analysis, elemental analysis and IR spectroscopy. In the crystal structure of (I), each Ca^II cation binds to six carboxylate groups from four symmetry-related L²⁻ dianions. The hexadentate L²⁻ ligand links four symmetry-related calcium cations into a 2D layer-like structure, which can be simplified as a uninodal SP 2-periodic (3,6)III net with the point symbol (4³·6³). In the lattice, all layers pack in parallel arrays through weak interlayer hydrogen bonding and π–π interactions. The thermal stability and photoluminescence properties of (I) have been investigated. Thermogravimetric analysis reveals the different thermal stabilities of the two coordinated water molecules due to their different hydrogen-bonding interactions. The title coordination polymer exhibits an excitation-wavelength-dependent fluorescence in the solid state.

Keywords: coordination polymer; photoluminescence; thermal stability; crystal structure; terephthaloyl; diazanediyl; diacetic acid; two-dimensional layer; red-edge effect; excitation-wavelength-dependent luminescence; diffuse reflectance UV–Vis spectroscopy.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S205322962101041X/dg3022sup1.cif Contains datablocks I, global
	Structure factor file (CIF format) https://doi.org/10.1107/S205322962101041X/dg3022Isup2.hkl Contains datablock I
	Portable Document Format (PDF) file https://doi.org/10.1107/S205322962101041X/dg3022sup3.pdf Additional figures

CCDC reference: 942902

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: DIAMOND (Brandenburg, 2008); software used to prepare material for publication: SHELXL2014 (Sheldrick, 2015).

Poly[[diaqua-[µ₄-2,2'-[terephthaloylbis(azanediyl)]diacetato]calcium(II)] monohydrate] top

Crystal data top

[Ca(C₁₂H₁₀N₂O₆)(H₂O)₂]·H₂O	Z = 2
M_r = 372.35	F(000) = 388
Triclinic, P1	D_x = 1.585 Mg m⁻³
a = 6.661 (3) Å	Mo Kα radiation, λ = 0.71073 Å
b = 9.833 (5) Å	Cell parameters from 2311 reflections
c = 12.612 (6) Å	θ = 2.4–27.3°
α = 74.277 (6)°	µ = 0.45 mm⁻¹
β = 79.224 (6)°	T = 298 K
γ = 84.609 (7)°	Block, colorless
V = 780.3 (7) Å³	0.10 × 0.05 × 0.05 mm

Data collection top

Bruker APEXII CCD area detector diffractometer	2466 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.030
phi and ω scans	θ_max = 27.5°, θ_min = 1.7°
Absorption correction: multi-scan (SADABS; Bruker, 2004)	h = −8→8
T_min = 0.956, T_max = 0.978	k = −12→12
6752 measured reflections	l = −16→16
3500 independent reflections

Refinement top

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)] = 0.042	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.096	H-atom parameters constrained
S = 1.00	w = 1/[σ²(F_o²) + (0.037P)² + 0.2954P] where P = (F_o² + 2F_c²)/3
3500 reflections	(Δ/σ)_max = 0.001
221 parameters	Δρ_max = 0.26 e Å⁻³
6 restraints	Δρ_min = −0.38 e Å⁻³

Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Ca1	1.25863 (7)	1.11412 (5)	0.45454 (4)	0.02446 (13)
O1	1.3797 (2)	0.91071 (17)	0.59367 (14)	0.0294 (4)
O2	1.0549 (2)	0.87796 (19)	0.60380 (14)	0.0351 (4)
C1	1.2164 (3)	0.8514 (2)	0.64274 (19)	0.0222 (5)
C2	1.2265 (4)	0.7426 (3)	0.7532 (2)	0.0313 (6)
H2A	1.2869	0.6548	0.7379	0.038*
H2B	1.3168	0.7752	0.7924	0.038*
N1	1.0319 (3)	0.7141 (2)	0.82597 (17)	0.0312 (5)
H1	0.9840	0.6315	0.8409	0.037*
O3	0.9881 (3)	0.93131 (18)	0.85523 (15)	0.0363 (4)
C10	0.1414 (4)	0.6689 (3)	1.15025 (19)	0.0260 (5)
C7	0.3423 (4)	0.7073 (2)	1.07676 (19)	0.0254 (5)
C8	0.3700 (4)	0.8379 (2)	0.9991 (2)	0.0317 (6)
H8	0.2613	0.9046	0.9920	0.038*
C3	0.9245 (3)	0.8125 (2)	0.87056 (19)	0.0265 (5)
C4	0.7218 (3)	0.7711 (2)	0.9416 (2)	0.0264 (5)
C9	0.5577 (4)	0.8690 (3)	0.9327 (2)	0.0323 (6)
H9	0.5745	0.9567	0.8812	0.039*
C5	0.6936 (4)	0.6400 (3)	1.0178 (2)	0.0314 (6)
H5	0.8017	0.5728	1.0240	0.038*
C6	0.5061 (4)	0.6089 (3)	1.0844 (2)	0.0312 (6)
H6	0.4890	0.5207	1.1351	0.037*
O4	0.0976 (3)	0.54303 (17)	1.18875 (15)	0.0370 (4)
N2	0.0128 (3)	0.7737 (2)	1.17112 (17)	0.0309 (5)
H2	0.0493	0.8593	1.1420	0.037*
C11	−0.1854 (4)	0.7503 (3)	1.2404 (2)	0.0349 (6)
H11A	−0.2194	0.6536	1.2494	0.042*
H11B	−0.2860	0.8120	1.2017	0.042*
C12	−0.2031 (3)	0.7750 (2)	1.3545 (2)	0.0270 (5)
O5	−0.3795 (2)	0.77374 (18)	1.41158 (14)	0.0323 (4)
O6	−0.0473 (2)	0.79722 (19)	1.38916 (15)	0.0358 (4)
O7	1.3077 (2)	0.95735 (18)	0.33418 (14)	0.0340 (4)
H7A	1.1963	0.9079	0.3427	0.041*
H7B	1.4032	0.8887	0.3530	0.041*
O8	1.2872 (3)	1.35794 (19)	0.35771 (17)	0.0490 (5)
H8A	1.2760	1.4133	0.4051	0.059*
H8B	1.1812	1.3909	0.3215	0.059*
O9	0.2835 (6)	0.5726 (5)	0.4705 (9)	0.084 (2)	0.843 (18)
H9A	0.3791	0.6102	0.4872	0.101*
H9B	0.1860	0.6336	0.4574	0.101*
O9A	0.314 (4)	0.604 (3)	0.402 (4)	0.084 (2)	0.157 (18)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Ca1	0.0161 (2)	0.0298 (3)	0.0264 (3)	−0.00160 (18)	−0.00507 (19)	−0.0043 (2)
O1	0.0173 (8)	0.0344 (9)	0.0314 (9)	−0.0076 (7)	−0.0004 (7)	−0.0004 (7)
O2	0.0188 (8)	0.0493 (11)	0.0387 (10)	0.0025 (7)	−0.0122 (8)	−0.0103 (9)
C1	0.0168 (11)	0.0245 (12)	0.0249 (12)	0.0009 (9)	−0.0024 (10)	−0.0072 (10)
C2	0.0217 (12)	0.0328 (13)	0.0320 (14)	0.0008 (10)	−0.0010 (11)	0.0009 (11)
N1	0.0293 (11)	0.0246 (11)	0.0336 (12)	−0.0079 (9)	0.0087 (9)	−0.0044 (9)
O3	0.0337 (10)	0.0284 (9)	0.0475 (12)	−0.0079 (8)	−0.0040 (9)	−0.0105 (8)
C10	0.0260 (12)	0.0308 (13)	0.0221 (12)	−0.0046 (10)	−0.0038 (10)	−0.0072 (10)
C7	0.0248 (12)	0.0285 (12)	0.0238 (13)	−0.0049 (10)	−0.0030 (10)	−0.0076 (10)
C8	0.0276 (13)	0.0285 (13)	0.0341 (15)	0.0021 (10)	−0.0035 (11)	−0.0023 (11)
C3	0.0236 (12)	0.0291 (13)	0.0252 (13)	−0.0017 (10)	−0.0036 (10)	−0.0045 (10)
C4	0.0250 (12)	0.0298 (13)	0.0252 (13)	−0.0042 (10)	−0.0029 (10)	−0.0085 (10)
C9	0.0335 (14)	0.0290 (13)	0.0291 (14)	−0.0026 (11)	−0.0025 (11)	0.0001 (11)
C5	0.0281 (13)	0.0309 (13)	0.0322 (14)	0.0016 (11)	−0.0032 (11)	−0.0056 (11)
C6	0.0309 (14)	0.0285 (13)	0.0295 (14)	−0.0030 (10)	−0.0009 (11)	−0.0018 (11)
O4	0.0355 (10)	0.0261 (9)	0.0446 (11)	−0.0083 (8)	0.0016 (9)	−0.0043 (8)
N2	0.0274 (11)	0.0298 (11)	0.0347 (12)	−0.0050 (9)	0.0052 (9)	−0.0126 (9)
C11	0.0246 (13)	0.0467 (16)	0.0374 (15)	−0.0029 (11)	−0.0014 (12)	−0.0196 (13)
C12	0.0226 (12)	0.0230 (12)	0.0344 (14)	−0.0009 (9)	−0.0035 (11)	−0.0065 (10)
O5	0.0208 (9)	0.0438 (10)	0.0333 (10)	−0.0004 (7)	−0.0012 (8)	−0.0144 (8)
O6	0.0228 (9)	0.0484 (11)	0.0403 (11)	−0.0072 (8)	−0.0066 (8)	−0.0154 (9)
O7	0.0232 (9)	0.0425 (10)	0.0389 (11)	−0.0013 (7)	−0.0090 (8)	−0.0122 (8)
O8	0.0557 (13)	0.0368 (11)	0.0530 (13)	−0.0031 (9)	−0.0215 (11)	−0.0003 (9)
O9	0.061 (2)	0.045 (2)	0.152 (7)	−0.0021 (15)	−0.041 (3)	−0.022 (3)
O9A	0.061 (2)	0.045 (2)	0.152 (7)	−0.0021 (15)	−0.041 (3)	−0.022 (3)

Geometric parameters (Å, º) top

Ca1—O2ⁱ	2.3284 (19)	C8—C9	1.378 (3)
Ca1—O1ⁱⁱ	2.3778 (19)	C8—H8	0.9300
Ca1—O8	2.385 (2)	C3—C4	1.498 (3)
Ca1—O7	2.403 (2)	C4—C9	1.387 (3)
Ca1—O1	2.4606 (18)	C4—C5	1.389 (3)
Ca1—O6ⁱⁱⁱ	2.508 (2)	C9—H9	0.9300
Ca1—O5ⁱⁱⁱ	2.5297 (19)	C5—C6	1.378 (3)
Ca1—O2	2.837 (2)	C5—H5	0.9300
Ca1—C12ⁱⁱⁱ	2.852 (3)	C6—H6	0.9300
Ca1—Ca1ⁱⁱ	3.9140 (17)	N2—C11	1.441 (3)
Ca1—Ca1ⁱ	4.0994 (19)	N2—H2	0.8600
O1—C1	1.256 (3)	C11—C12	1.506 (4)
O1—Ca1ⁱⁱ	2.3778 (19)	C11—H11A	0.9700
O2—C1	1.242 (3)	C11—H11B	0.9700
O2—Ca1ⁱ	2.3285 (19)	C12—O6	1.257 (3)
C1—C2	1.518 (3)	C12—O5	1.257 (3)
C2—N1	1.444 (3)	C12—Ca1ⁱⁱⁱ	2.852 (3)
C2—H2A	0.9700	O5—Ca1ⁱⁱⁱ	2.5297 (19)
C2—H2B	0.9700	O6—Ca1ⁱⁱⁱ	2.508 (2)
N1—C3	1.334 (3)	O7—H7A	0.8990
N1—H1	0.8600	O7—H7B	0.8980
O3—C3	1.234 (3)	O8—H8A	0.9010
C10—O4	1.242 (3)	O8—H8B	0.8999
C10—N2	1.328 (3)	O9—H9A	0.8499
C10—C7	1.495 (3)	O9—H9B	0.8499
C7—C6	1.388 (3)	O9A—H9A	1.2543
C7—C8	1.392 (3)	O9A—H9B	1.0682

O2ⁱ—Ca1—O1ⁱⁱ	146.09 (7)	O2—C1—O1	122.7 (2)
O2ⁱ—Ca1—O8	88.29 (7)	O2—C1—C2	121.0 (2)
O1ⁱⁱ—Ca1—O8	87.29 (6)	O1—C1—C2	116.26 (19)
O2ⁱ—Ca1—O7	75.07 (6)	N1—C2—C1	114.88 (19)
O1ⁱⁱ—Ca1—O7	76.19 (6)	N1—C2—H2A	108.5
O8—Ca1—O7	114.08 (8)	C1—C2—H2A	108.5
O2ⁱ—Ca1—O1	122.68 (6)	N1—C2—H2B	108.5
O1ⁱⁱ—Ca1—O1	72.02 (6)	C1—C2—H2B	108.5
O8—Ca1—O1	147.67 (7)	H2A—C2—H2B	107.5
O7—Ca1—O1	85.41 (7)	C3—N1—C2	121.7 (2)
O2ⁱ—Ca1—O6ⁱⁱⁱ	83.43 (7)	C3—N1—H1	119.2
O1ⁱⁱ—Ca1—O6ⁱⁱⁱ	129.57 (6)	C2—N1—H1	119.2
O8—Ca1—O6ⁱⁱⁱ	85.23 (7)	O4—C10—N2	121.9 (2)
O7—Ca1—O6ⁱⁱⁱ	150.14 (6)	O4—C10—C7	120.5 (2)
O1—Ca1—O6ⁱⁱⁱ	89.15 (7)	N2—C10—C7	117.6 (2)
O2ⁱ—Ca1—O5ⁱⁱⁱ	132.81 (6)	C6—C7—C8	118.6 (2)
O1ⁱⁱ—Ca1—O5ⁱⁱⁱ	78.00 (6)	C6—C7—C10	119.2 (2)
O8—Ca1—O5ⁱⁱⁱ	75.16 (7)	C8—C7—C10	122.2 (2)
O7—Ca1—O5ⁱⁱⁱ	151.98 (6)	C9—C8—C7	120.3 (2)
O1—Ca1—O5ⁱⁱⁱ	76.37 (7)	C9—C8—H8	119.8
O6ⁱⁱⁱ—Ca1—O5ⁱⁱⁱ	51.89 (6)	C7—C8—H8	119.8
O2ⁱ—Ca1—O2	75.37 (7)	O3—C3—N1	122.2 (2)
O1ⁱⁱ—Ca1—O2	117.18 (5)	O3—C3—C4	121.3 (2)
O8—Ca1—O2	154.46 (6)	N1—C3—C4	116.5 (2)
O7—Ca1—O2	80.94 (7)	C9—C4—C5	118.9 (2)
O1—Ca1—O2	48.26 (5)	C9—C4—C3	118.6 (2)
O6ⁱⁱⁱ—Ca1—O2	73.66 (6)	C5—C4—C3	122.5 (2)
O5ⁱⁱⁱ—Ca1—O2	101.55 (6)	C8—C9—C4	120.8 (2)
O2ⁱ—Ca1—C12ⁱⁱⁱ	109.22 (7)	C8—C9—H9	119.6
O1ⁱⁱ—Ca1—C12ⁱⁱⁱ	103.45 (6)	C4—C9—H9	119.6
O8—Ca1—C12ⁱⁱⁱ	82.29 (8)	C6—C5—C4	120.3 (2)
O7—Ca1—C12ⁱⁱⁱ	163.46 (6)	C6—C5—H5	119.9
O1—Ca1—C12ⁱⁱⁱ	78.88 (7)	C4—C5—H5	119.9
O6ⁱⁱⁱ—Ca1—C12ⁱⁱⁱ	26.12 (6)	C5—C6—C7	121.0 (2)
O5ⁱⁱⁱ—Ca1—C12ⁱⁱⁱ	26.14 (6)	C5—C6—H6	119.5
O2—Ca1—C12ⁱⁱⁱ	84.72 (7)	C7—C6—H6	119.5
O2ⁱ—Ca1—Ca1ⁱⁱ	147.52 (5)	C10—N2—C11	122.8 (2)
O1ⁱⁱ—Ca1—Ca1ⁱⁱ	36.72 (4)	C10—N2—H2	118.6
O8—Ca1—Ca1ⁱⁱ	120.16 (6)	C11—N2—H2	118.6
O7—Ca1—Ca1ⁱⁱ	78.74 (5)	N2—C11—C12	115.2 (2)
O1—Ca1—Ca1ⁱⁱ	35.30 (4)	N2—C11—H11A	108.5
O6ⁱⁱⁱ—Ca1—Ca1ⁱⁱ	112.19 (5)	C12—C11—H11A	108.5
O5ⁱⁱⁱ—Ca1—Ca1ⁱⁱ	74.07 (5)	N2—C11—H11B	108.5
O2—Ca1—Ca1ⁱⁱ	81.89 (5)	C12—C11—H11B	108.5
C12ⁱⁱⁱ—Ca1—Ca1ⁱⁱ	91.15 (5)	H11A—C11—H11B	107.5
O2ⁱ—Ca1—Ca1ⁱ	42.03 (5)	O6—C12—O5	122.5 (2)
O1ⁱⁱ—Ca1—Ca1ⁱ	141.95 (5)	O6—C12—C11	120.6 (2)
O8—Ca1—Ca1ⁱ	127.40 (5)	O5—C12—C11	116.8 (2)
O7—Ca1—Ca1ⁱ	75.20 (5)	O6—C12—Ca1ⁱⁱⁱ	61.47 (13)
O1—Ca1—Ca1ⁱ	81.14 (5)	O5—C12—Ca1ⁱⁱⁱ	62.46 (13)
O6ⁱⁱⁱ—Ca1—Ca1ⁱ	74.95 (5)	C11—C12—Ca1ⁱⁱⁱ	167.11 (17)
O5ⁱⁱⁱ—Ca1—Ca1ⁱ	121.64 (5)	C12—O5—Ca1ⁱⁱⁱ	91.40 (14)
O2—Ca1—Ca1ⁱ	33.34 (3)	C12—O6—Ca1ⁱⁱⁱ	92.41 (15)
C12ⁱⁱⁱ—Ca1—Ca1ⁱ	97.09 (5)	Ca1—O7—H7A	112.0
Ca1ⁱⁱ—Ca1—Ca1ⁱ	112.43 (4)	Ca1—O7—H7B	111.4
C1—O1—Ca1ⁱⁱ	146.93 (14)	H7A—O7—H7B	102.2
C1—O1—Ca1	102.32 (13)	Ca1—O8—H8A	111.9
Ca1ⁱⁱ—O1—Ca1	107.98 (6)	Ca1—O8—H8B	111.6
C1—O2—Ca1ⁱ	169.89 (17)	H8A—O8—H8B	102.1
C1—O2—Ca1	84.81 (14)	H9A—O9—H9B	109.5
Ca1ⁱ—O2—Ca1	104.63 (6)	H9A—O9A—H9B	72.9

Ca1ⁱ—O2—C1—O1	146.1 (8)	O3—C3—C4—C5	−137.6 (3)
Ca1—O2—C1—O1	−13.2 (2)	N1—C3—C4—C5	41.9 (3)
Ca1ⁱ—O2—C1—C2	−33.3 (10)	C7—C8—C9—C4	0.2 (4)
Ca1—O2—C1—C2	167.4 (2)	C5—C4—C9—C8	0.8 (4)
Ca1ⁱⁱ—O1—C1—O2	−140.5 (2)	C3—C4—C9—C8	−177.6 (2)
Ca1—O1—C1—O2	15.6 (3)	C9—C4—C5—C6	−0.9 (4)
Ca1ⁱⁱ—O1—C1—C2	38.9 (4)	C3—C4—C5—C6	177.5 (2)
Ca1—O1—C1—C2	−164.99 (17)	C4—C5—C6—C7	0.0 (4)
O2—C1—C2—N1	−21.9 (3)	C8—C7—C6—C5	0.9 (4)
O1—C1—C2—N1	158.7 (2)	C10—C7—C6—C5	179.8 (2)
C1—C2—N1—C3	−65.6 (3)	O4—C10—N2—C11	0.6 (4)
O4—C10—C7—C6	−23.9 (3)	C7—C10—N2—C11	179.8 (2)
N2—C10—C7—C6	156.9 (2)	C10—N2—C11—C12	106.1 (3)
O4—C10—C7—C8	154.8 (2)	N2—C11—C12—O6	−8.3 (3)
N2—C10—C7—C8	−24.4 (3)	N2—C11—C12—O5	171.0 (2)
C6—C7—C8—C9	−1.0 (4)	N2—C11—C12—Ca1ⁱⁱⁱ	87.4 (7)
C10—C7—C8—C9	−179.8 (2)	O6—C12—O5—Ca1ⁱⁱⁱ	13.8 (2)
C2—N1—C3—O3	−2.4 (4)	C11—C12—O5—Ca1ⁱⁱⁱ	−165.52 (19)
C2—N1—C3—C4	178.1 (2)	O5—C12—O6—Ca1ⁱⁱⁱ	−13.9 (2)
O3—C3—C4—C9	40.8 (3)	C11—C12—O6—Ca1ⁱⁱⁱ	165.4 (2)
N1—C3—C4—C9	−139.7 (2)

Symmetry codes: (i) −x+2, −y+2, −z+1; (ii) −x+3, −y+2, −z+1; (iii) −x+1, −y+2, −z+2.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1···O4^iv	0.86	2.00	2.810 (3)	158
N2—H2···O3ⁱⁱⁱ	0.86	2.06	2.828 (3)	148
O7—H7A···O6^v	0.90	1.95	2.837 (3)	170
O7—H7B···O5^vi	0.90	1.89	2.766 (2)	166
O8—H8B···O4^vii	0.90	2.05	2.814 (3)	143
C11—H11A···O4	0.97	2.38	2.769 (3)	104
O8—H8A···O9^viii	0.90	1.97	2.843 (8)	164
O8—H8A···O9A^viii	0.90	1.90	2.660 (3)	140
O9—H9A···O5^v	0.85	2.27	2.986 (6)	142
O9—H9B···O6^ix	0.85	2.24	3.080 (6)	169

Symmetry codes: (iii) −x+1, −y+2, −z+2; (iv) −x+1, −y+1, −z+2; (v) x+1, y, z−1; (vi) x+2, y, z−1; (vii) x+1, y+1, z−1; (viii) x+1, y+1, z; (ix) x, y, z−1.

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A two-dimensional calcium (II) coordination polymer constructed from 2,2′-[tereph­thal­oyl­bis(aza­nedi­yl)]di­acetate: synthesis, structure and properties

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A two-dimensional calcium (II) coordination polymer constructed from 2,2′-[terephthaloylbis(azanediyl)]diacetate: synthesis, structure and properties