Poly[[(μ-aqua)[μ4-4-(carboxyl­atometh­yl)ben­zo­ato]cobalt(II)] hemi[1,4-bis­(pyridin-4-ylmeth­yl)piper­azine] hemihydrate]

Gaskin, G.J.; LaDuca, R.L.

doi:10.1107/S241431462300648X

Poly[[(μ-aqua)[μ₄-4-(carboxylatomethyl)benzoato]cobalt(II)] hemi[1,4-bis(pyridin-4-ylmethyl)piperazine] hemihydrate]

In the title compound, {[Co(C₉H₆O₄)(H₂O)]·0.5C₁₆H₂₀N₄·0.5H₂O}_n, two-dimensional coordination polymer slabs are held together in the three-dimensional crystal structure by means of O—H

N hydrogen bonding between bound water molecules and pyridyl N atoms of cocrystallized 1,4-bis(pyridin-4-ylmethyl)piperazine molecules.

Keywords: crystal structure; coordination polymer; piperazine; cobalt.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S241431462300648X/bt4140sup1.cif Contains datablocks I, global
	Structure factor file (CIF format) https://doi.org/10.1107/S241431462300648X/bt4140Isup2.hkl Contains datablock I

CCDC reference: 1946425

checkCIF report

Key indicators

Structure: I

Single-crystal X-ray study
T = 173 K
Mean (C-C) = 0.005 Å
Disorder in solvent or counterion
R factor = 0.041
wR factor = 0.113
Data-to-parameter ratio = 12.7

checkCIF/PLATON results

No syntax errors found



Alert level B
PLAT420_ALERT_2_B D-H Bond Without Acceptor  O1W      --H1WB     .     Please Check

Alert level C
PLAT042_ALERT_1_C Calc. and Reported MoietyFormula Strings  Differ     Please Check
PLAT260_ALERT_2_C Large Average Ueq of Residue Including       O1W      0.131 Check
PLAT911_ALERT_3_C Missing FCF Refl Between Thmin & STh/L=    0.600         35 Report
PLAT975_ALERT_2_C Check Calcd Resid. Dens.  0.93Ang From O4      .       0.40 eA-3
PLAT976_ALERT_2_C Check Calcd Resid. Dens.  0.56Ang From O1W     .      -0.64 eA-3
PLAT976_ALERT_2_C Check Calcd Resid. Dens.  0.59Ang From O1W     .      -0.49 eA-3

Alert level G
PLAT002_ALERT_2_G Number of Distance or Angle Restraints on AtSite          5 Note
PLAT004_ALERT_5_G Polymeric Structure Found with Maximum Dimension          2 Info
PLAT007_ALERT_5_G Number of Unrefined Donor-H Atoms ..............          2 Report
PLAT083_ALERT_2_G SHELXL Second Parameter in WGHT  Unusually Large       5.85 Why ?
PLAT172_ALERT_4_G The CIF-Embedded .res File Contains DFIX Records          3 Report
PLAT300_ALERT_4_G Atom Site Occupancy of O1W        Constrained at        0.5 Check
PLAT300_ALERT_4_G Atom Site Occupancy of H1WA       Constrained at        0.5 Check
PLAT300_ALERT_4_G Atom Site Occupancy of H1WB       Constrained at        0.5 Check
PLAT302_ALERT_4_G Anion/Solvent/Minor-Residue Disorder (Resd  3  )       100% Note
PLAT415_ALERT_2_G Short Inter D-H..H-X       H1WA     ..H17B     .       2.03 Ang.
                                                      x,y,z  =      1_555 Check
PLAT415_ALERT_2_G Short Inter D-H..H-X       H1WA     ..H16B     .       2.13 Ang.
                                                1-x,1-y,2-z  =      5_667 Check
PLAT415_ALERT_2_G Short Inter D-H..H-X       H1WB     ..H15B     .       2.12 Ang.
                                                    x,1+y,z  =      1_565 Check
PLAT720_ALERT_4_G Number of Unusual/Non-Standard Labels ..........          2 Note
PLAT794_ALERT_5_G Tentative Bond Valency for Co1       (II)      .       2.03 Info
PLAT802_ALERT_4_G CIF Input Record(s) with more than 80 Characters          6 Info
PLAT860_ALERT_3_G Number of Least-Squares Restraints .............          3 Note
PLAT910_ALERT_3_G Missing # of FCF Reflection(s) Below Theta(Min).          1 Note
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L=  0.600          2 Note
PLAT941_ALERT_3_G Average HKL Measurement Multiplicity ...........        2.8 Low
PLAT978_ALERT_2_G Number C-C Bonds with Positive Residual Density.          1 Info

   0 ALERT level A = Most likely a serious problem - resolve or explain
   1 ALERT level B = A potentially serious problem, consider carefully
   6 ALERT level C = Check. Ensure it is not caused by an omission or oversight
  20 ALERT level G = General information/check it is not something unexpected

   1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
  11 ALERT type 2 Indicator that the structure model may be wrong or deficient
   4 ALERT type 3 Indicator that the structure quality may be low
   8 ALERT type 4 Improvement, methodology, query or suggestion
   3 ALERT type 5 Informative message, check

Computing details top

Data collection: COSMO (Bruker, 2009); cell refinement: SAINT (Bruker, 2014); data reduction: SAINT (Bruker, 2014); program(s) used to solve structure: SHELXT (Sheldrick, 2015); program(s) used to refine structure: SHELXL (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).

Poly[[(µ-aqua)[µ₄-4-(carboxylatomethyl)benzoato]cobalt(II)] hemi[1,4-bis(pyridin-4-ylmethyl)piperazine] hemihydrate] top

Crystal data top

[Co(C₉H₆O₄)(H₂O)]·0.5C₁₆H₂₀N₄·0.5H₂O	F(000) = 1648
M_r = 796.54	D_x = 1.559 Mg m⁻³
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
a = 27.036 (6) Å	Cell parameters from 3416 reflections
b = 6.3093 (13) Å	θ = 2.1–25.4°
c = 20.653 (5) Å	µ = 1.05 mm⁻¹
β = 105.536 (6)°	T = 173 K
V = 3394.2 (13) Å³	Block, pink
Z = 4	0.27 × 0.14 × 0.09 mm

Data collection top

Bruker APEXII CCD diffractometer	3089 independent reflections
Radiation source: sealed tube	2334 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.044
Detector resolution: 8.36 pixels mm^-1	θ_max = 25.4°, θ_min = 2.1°
ω scans	h = −31→32
Absorption correction: multi-scan (SADABS; Bruker, 2014)	k = −7→7
T_min = 0.669, T_max = 0.745	l = −24→24
8691 measured reflections

Refinement top

Refinement on F²	Primary atom site location: dual
Least-squares matrix: full	Hydrogen site location: mixed
R[F² > 2σ(F²)] = 0.041	H atoms treated by a mixture of independent and constrained refinement
wR(F²) = 0.113	w = 1/[σ²(F_o²) + (0.0475P)² + 5.8489P] where P = (F_o² + 2F_c²)/3
S = 1.06	(Δ/σ)_max = 0.002
3089 reflections	Δρ_max = 0.65 e Å⁻³
243 parameters	Δρ_min = −0.66 e Å⁻³
3 restraints

Special details top

Experimental. Data was collected using a BRUKER CCD (charge coupled device) based diffractometer equipped with an Oxford low-temperature apparatus operating at 173 K. A suitable crystal was chosen and mounted on a nylon loop using Paratone oil. Data were measured using omega scans of 0.5° per frame for 30 s. The total number of images were based on results from the program COSMO where redundancy was expected to be 4 and completeness to 0.83Å to 100%. Cell parameters were retrieved using APEX II software and refined using SAINT on all observed reflections.Data reduction was performed using the SAINT software which corrects for Lp. Scaling and absorption corrections were applied using SADABS6 multi-scan technique, supplied by George Sheldrick. The structure was solved by the direct method using the SHELXT program and refined by least squares method on F2, SHELXL, incorporated in OLEX2.

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. The structure was refined by Least Squares using version 2018/3 of XL (Sheldrick, 2015) incorporated in Olex2 (Dolomanov et al., 2009). All non-hydrogen atoms were refined anisotropically. Hydrogen atom positions were calculated geometrically and refined using the riding model, except for the Hydrogen atom on the nitrogen atom which was found by difference Fourier methods and refined isotropically.

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

	x	y	z	U_iso*/U_eq	Occ. (<1)
Co1	0.74834 (2)	0.12245 (6)	0.74217 (2)	0.01613 (16)
O1	0.77518 (9)	0.2010 (3)	0.66350 (10)	0.0218 (5)
O2	0.77731 (9)	0.5545 (3)	0.67641 (10)	0.0214 (5)
O3	0.84413 (9)	0.8638 (3)	0.37647 (11)	0.0251 (6)
O4	0.79387 (8)	0.6398 (3)	0.30472 (10)	0.0177 (5)
O5	0.69426 (9)	0.3776 (3)	0.72357 (11)	0.0176 (5)
N1	0.61639 (12)	0.3261 (5)	0.77903 (15)	0.0320 (7)
N2	0.50168 (11)	0.4195 (5)	0.93570 (14)	0.0300 (7)
C1	0.78312 (12)	0.3868 (5)	0.64604 (14)	0.0174 (7)
C2	0.80076 (12)	0.4150 (5)	0.58368 (15)	0.0200 (7)
C3	0.80611 (13)	0.6162 (5)	0.56001 (16)	0.0222 (7)
H3	0.799069	0.736233	0.583858	0.027*
C4	0.82169 (14)	0.6449 (5)	0.50162 (16)	0.0272 (8)
H4	0.824641	0.784229	0.485601	0.033*
C5	0.83291 (12)	0.4727 (5)	0.46672 (14)	0.0185 (7)
C6	0.82768 (13)	0.2713 (5)	0.49056 (16)	0.0255 (8)
H6	0.835191	0.151654	0.466903	0.031*
C7	0.81175 (13)	0.2408 (5)	0.54812 (16)	0.0251 (8)
H7	0.808268	0.101157	0.563545	0.030*
C8	0.85144 (13)	0.4970 (5)	0.40366 (14)	0.0202 (7)
H8A	0.889229	0.513829	0.417283	0.024*
H8B	0.843514	0.364930	0.377015	0.024*
C9	0.82837 (13)	0.6809 (5)	0.35940 (15)	0.0195 (7)
C10	0.60190 (15)	0.4890 (7)	0.81086 (19)	0.0395 (10)
H10	0.617359	0.623322	0.809065	0.047*
C11	0.56540 (16)	0.4711 (6)	0.8464 (2)	0.0419 (10)
H11	0.556036	0.591621	0.867983	0.050*
C12	0.54265 (14)	0.2779 (6)	0.85029 (17)	0.0304 (8)
C13	0.55802 (15)	0.1093 (6)	0.81812 (19)	0.0355 (9)
H13	0.543538	−0.027144	0.819787	0.043*
C14	0.59459 (15)	0.1393 (6)	0.78341 (19)	0.0354 (9)
H14	0.604698	0.020841	0.761580	0.043*
C15	0.50169 (15)	0.2492 (7)	0.88805 (19)	0.0373 (10)
H15A	0.467525	0.242547	0.855163	0.045*
H15B	0.507536	0.112621	0.912525	0.045*
C16	0.54563 (14)	0.4017 (6)	0.99510 (18)	0.0345 (9)
H16A	0.577929	0.403010	0.981173	0.041*
H16B	0.543748	0.265931	1.018344	0.041*
C17	0.45449 (14)	0.4153 (7)	0.95746 (19)	0.0371 (10)
H17A	0.452101	0.279572	0.980461	0.045*
H17B	0.424369	0.426346	0.917854	0.045*
O1W	0.4535 (4)	0.7370 (16)	0.8420 (5)	0.131 (4)	0.5
H1WA	0.455906	0.672793	0.879981	0.196*	0.5
H1WB	0.468736	0.858073	0.853331	0.196*	0.5
H5A	0.6813 (14)	0.440 (6)	0.6864 (13)	0.044 (12)*
H5B	0.6705 (14)	0.359 (7)	0.743 (2)	0.072 (17)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Co1	0.0225 (3)	0.0114 (2)	0.0161 (2)	−0.00011 (18)	0.00797 (18)	0.00042 (16)
O1	0.0344 (15)	0.0149 (12)	0.0194 (11)	0.0002 (10)	0.0130 (10)	0.0009 (9)
O2	0.0313 (14)	0.0169 (12)	0.0196 (11)	−0.0004 (10)	0.0132 (10)	0.0000 (9)
O3	0.0346 (15)	0.0200 (13)	0.0178 (11)	−0.0065 (11)	0.0019 (10)	0.0005 (9)
O4	0.0228 (13)	0.0150 (12)	0.0127 (10)	−0.0003 (9)	0.0003 (9)	−0.0008 (8)
O5	0.0221 (13)	0.0143 (12)	0.0168 (11)	0.0021 (10)	0.0061 (10)	0.0019 (9)
N1	0.0281 (19)	0.0404 (19)	0.0293 (16)	0.0012 (15)	0.0109 (14)	0.0035 (14)
N2	0.0225 (17)	0.0423 (19)	0.0271 (15)	−0.0019 (14)	0.0101 (13)	−0.0023 (13)
C1	0.0181 (18)	0.0184 (17)	0.0152 (15)	0.0010 (14)	0.0037 (13)	0.0017 (13)
C2	0.0214 (19)	0.0233 (18)	0.0160 (15)	0.0024 (14)	0.0059 (13)	0.0013 (13)
C3	0.034 (2)	0.0137 (16)	0.0223 (16)	0.0006 (15)	0.0127 (15)	−0.0021 (13)
C4	0.045 (2)	0.0169 (18)	0.0232 (17)	−0.0018 (16)	0.0160 (16)	0.0033 (14)
C5	0.0194 (18)	0.0206 (17)	0.0148 (14)	−0.0006 (14)	0.0034 (13)	−0.0001 (13)
C6	0.036 (2)	0.0184 (18)	0.0257 (17)	0.0017 (16)	0.0138 (16)	−0.0015 (14)
C7	0.037 (2)	0.0154 (17)	0.0270 (17)	0.0014 (16)	0.0160 (16)	0.0031 (14)
C8	0.0246 (19)	0.0197 (17)	0.0171 (15)	0.0014 (15)	0.0069 (14)	0.0028 (13)
C9	0.0214 (19)	0.0230 (18)	0.0172 (15)	−0.0015 (14)	0.0104 (14)	−0.0021 (13)
C10	0.046 (3)	0.035 (2)	0.043 (2)	−0.004 (2)	0.022 (2)	0.0025 (19)
C11	0.053 (3)	0.034 (2)	0.050 (2)	−0.002 (2)	0.032 (2)	−0.006 (2)
C12	0.028 (2)	0.035 (2)	0.0288 (18)	−0.0014 (18)	0.0088 (16)	0.0007 (16)
C13	0.038 (2)	0.030 (2)	0.042 (2)	−0.0035 (18)	0.0172 (18)	0.0008 (17)
C14	0.040 (2)	0.034 (2)	0.036 (2)	0.0052 (19)	0.0168 (18)	−0.0008 (17)
C15	0.036 (2)	0.043 (2)	0.037 (2)	−0.005 (2)	0.0162 (18)	−0.0036 (18)
C16	0.022 (2)	0.050 (3)	0.033 (2)	0.0060 (18)	0.0099 (16)	−0.0004 (18)
C17	0.020 (2)	0.061 (3)	0.0313 (19)	−0.0041 (19)	0.0076 (16)	−0.0082 (18)
O1W	0.165 (10)	0.120 (8)	0.115 (8)	−0.008 (8)	0.052 (7)	0.013 (7)

Geometric parameters (Å, º) top

Co1—O1	2.011 (2)	C5—C8	1.523 (4)
Co1—O2ⁱ	2.029 (2)	C6—H6	0.9500
Co1—O4ⁱⁱ	2.094 (2)	C6—C7	1.382 (4)
Co1—O4ⁱⁱⁱ	2.140 (2)	C7—H7	0.9500
Co1—O5	2.139 (2)	C8—H8A	0.9900
Co1—O5ⁱ	2.169 (2)	C8—H8B	0.9900
O1—C1	1.262 (4)	C8—C9	1.505 (4)
O2—C1	1.261 (4)	C10—H10	0.9500
O3—C9	1.248 (4)	C10—C11	1.383 (5)
O4—C9	1.284 (4)	C11—H11	0.9500
O5—H5A	0.851 (19)	C11—C12	1.377 (5)
O5—H5B	0.855 (19)	C12—C13	1.376 (5)
N1—C10	1.334 (5)	C12—C15	1.526 (5)
N1—C14	1.332 (5)	C13—H13	0.9500
N2—C15	1.457 (5)	C13—C14	1.381 (5)
N2—C16	1.466 (5)	C14—H14	0.9500
N2—C17	1.462 (4)	C15—H15A	0.9900
C1—C2	1.499 (4)	C15—H15B	0.9900
C2—C3	1.382 (4)	C16—H16A	0.9900
C2—C7	1.397 (4)	C16—H16B	0.9900
C3—H3	0.9500	C16—C17^iv	1.515 (5)
C3—C4	1.392 (4)	C17—H17A	0.9900
C4—H4	0.9500	C17—H17B	0.9900
C4—C5	1.382 (4)	O1W—H1WA	0.8698
C5—C6	1.384 (5)	O1W—H1WB	0.8699

O1—Co1—O2ⁱ	177.55 (9)	C7—C6—H6	119.4
O1—Co1—O4ⁱⁱⁱ	92.37 (9)	C2—C7—H7	119.9
O1—Co1—O4ⁱⁱ	95.23 (9)	C6—C7—C2	120.1 (3)
O1—Co1—O5ⁱ	93.31 (9)	C6—C7—H7	119.9
O1—Co1—O5	92.67 (9)	C5—C8—H8A	108.6
O2ⁱ—Co1—O4ⁱⁱⁱ	85.22 (9)	C5—C8—H8B	108.6
O2ⁱ—Co1—O4ⁱⁱ	87.21 (9)	H8A—C8—H8B	107.5
O2ⁱ—Co1—O5	86.49 (9)	C9—C8—C5	114.8 (3)
O2ⁱ—Co1—O5ⁱ	87.29 (9)	C9—C8—H8A	108.6
O4ⁱⁱ—Co1—O4ⁱⁱⁱ	170.65 (6)	C9—C8—H8B	108.6
O4ⁱⁱⁱ—Co1—O5ⁱ	93.25 (8)	O3—C9—O4	123.2 (3)
O4ⁱⁱ—Co1—O5ⁱ	80.90 (9)	O3—C9—C8	119.1 (3)
O4ⁱⁱ—Co1—O5	104.48 (9)	O4—C9—C8	117.7 (3)
O5—Co1—O4ⁱⁱⁱ	80.55 (9)	N1—C10—H10	118.5
O5—Co1—O5ⁱ	171.56 (4)	N1—C10—C11	122.9 (4)
C1—O1—Co1	125.86 (19)	C11—C10—H10	118.5
C1—O2—Co1^v	134.8 (2)	C10—C11—H11	120.1
Co1ⁱⁱ—O4—Co1^vi	96.93 (8)	C12—C11—C10	119.8 (4)
C9—O4—Co1ⁱⁱ	138.0 (2)	C12—C11—H11	120.1
C9—O4—Co1^vi	123.7 (2)	C11—C12—C15	122.1 (3)
Co1—O5—Co1^v	94.73 (9)	C13—C12—C11	117.3 (3)
Co1—O5—H5A	127 (3)	C13—C12—C15	120.6 (3)
Co1^v—O5—H5A	93 (3)	C12—C13—H13	120.2
Co1^v—O5—H5B	120 (3)	C12—C13—C14	119.7 (4)
Co1—O5—H5B	112 (3)	C14—C13—H13	120.2
H5A—O5—H5B	108 (4)	N1—C14—C13	123.2 (4)
C14—N1—C10	117.0 (3)	N1—C14—H14	118.4
C15—N2—C16	111.2 (3)	C13—C14—H14	118.4
C15—N2—C17	110.6 (3)	N2—C15—C12	112.9 (3)
C17—N2—C16	108.7 (3)	N2—C15—H15A	109.0
O1—C1—C2	118.3 (3)	N2—C15—H15B	109.0
O2—C1—O1	125.7 (3)	C12—C15—H15A	109.0
O2—C1—C2	116.0 (3)	C12—C15—H15B	109.0
C3—C2—C1	120.0 (3)	H15A—C15—H15B	107.8
C3—C2—C7	118.7 (3)	N2—C16—H16A	109.7
C7—C2—C1	121.3 (3)	N2—C16—H16B	109.7
C2—C3—H3	119.6	N2—C16—C17^iv	110.0 (3)
C2—C3—C4	120.7 (3)	H16A—C16—H16B	108.2
C4—C3—H3	119.6	C17^iv—C16—H16A	109.7
C3—C4—H4	119.7	C17^iv—C16—H16B	109.7
C5—C4—C3	120.6 (3)	N2—C17—C16^iv	109.8 (3)
C5—C4—H4	119.7	N2—C17—H17A	109.7
C4—C5—C6	118.6 (3)	N2—C17—H17B	109.7
C4—C5—C8	122.4 (3)	C16^iv—C17—H17A	109.7
C6—C5—C8	119.0 (3)	C16^iv—C17—H17B	109.7
C5—C6—H6	119.4	H17A—C17—H17B	108.2
C7—C6—C5	121.3 (3)	H1WA—O1W—H1WB	104.5

Co1—O1—C1—O2	2.7 (5)	C5—C6—C7—C2	−0.3 (5)
Co1—O1—C1—C2	−176.9 (2)	C5—C8—C9—O3	76.4 (4)
Co1^v—O2—C1—O1	−3.5 (5)	C5—C8—C9—O4	−105.1 (3)
Co1^v—O2—C1—C2	176.2 (2)	C6—C5—C8—C9	145.6 (3)
Co1^vi—O4—C9—O3	−11.0 (4)	C7—C2—C3—C4	0.6 (5)
Co1ⁱⁱ—O4—C9—O3	−174.2 (2)	C8—C5—C6—C7	179.0 (3)
Co1^vi—O4—C9—C8	170.56 (19)	C10—N1—C14—C13	0.8 (6)
Co1ⁱⁱ—O4—C9—C8	7.3 (4)	C10—C11—C12—C13	0.3 (6)
O1—C1—C2—C3	175.1 (3)	C10—C11—C12—C15	−179.3 (4)
O1—C1—C2—C7	−4.5 (5)	C11—C12—C13—C14	−0.5 (6)
O2—C1—C2—C3	−4.6 (5)	C11—C12—C15—N2	−18.8 (5)
O2—C1—C2—C7	175.8 (3)	C12—C13—C14—N1	−0.1 (6)
N1—C10—C11—C12	0.5 (6)	C13—C12—C15—N2	161.7 (3)
C1—C2—C3—C4	−179.0 (3)	C14—N1—C10—C11	−1.0 (6)
C1—C2—C7—C6	179.6 (3)	C15—N2—C16—C17^iv	178.2 (3)
C2—C3—C4—C5	−1.0 (5)	C15—N2—C17—C16^iv	−177.9 (3)
C3—C2—C7—C6	0.1 (5)	C15—C12—C13—C14	179.1 (4)
C3—C4—C5—C6	0.8 (5)	C16—N2—C15—C12	−73.7 (4)
C3—C4—C5—C8	−178.3 (3)	C16—N2—C17—C16^iv	59.7 (4)
C4—C5—C6—C7	−0.2 (5)	C17—N2—C15—C12	165.4 (3)
C4—C5—C8—C9	−35.2 (5)	C17—N2—C16—C17^iv	−59.8 (4)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C11—H11···N2	0.95	2.53	2.860 (5)	101
O1W—H1WA···N2	0.87	2.16	2.847 (10)	136
O5—H5A···O3^vii	0.85 (2)	1.79 (2)	2.619 (3)	164 (4)
O5—H5B···N1	0.86 (2)	1.82 (2)	2.672 (4)	175 (5)

Symmetry code: (vii) −x+3/2, −y+3/2, −z+1.

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Poly[[(μ-aqua)[μ4-4-(carboxyl­atometh­yl)ben­zo­ato]cobalt(II)] hemi[1,4-bis­(pyridin-4-ylmeth­yl)piper­azine] hemihydrate]

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Poly[[(μ-aqua)[μ₄-4-(carboxylatomethyl)benzoato]cobalt(II)] hemi[1,4-bis(pyridin-4-ylmethyl)piperazine] hemihydrate]