Home Physical Sciences Crystal structure of (μ2-1-(4,4′-bipyridine-κ2N:N′)-bis[diaqua-(4-iodopyridine-2,6-dicarboxylato-κ3O,N,O′)–cobalt(II)], C24H20Co2I2N4O12
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Crystal structure of (μ2-1-(4,4′-bipyridine-κ2N:N′)-bis[diaqua-(4-iodopyridine-2,6-dicarboxylato-κ3O,N,O′)–cobalt(II)], C24H20Co2I2N4O12

  • Dong-Feng Hong ORCID logo EMAIL logo , Jia-Qi Ye and Wen-Bo Guo
Published/Copyright: July 4, 2023

Abstract

C24H20Co2I2N4O12, monoclinic, P21/c (no. 14), a = 10.5649(3) Å, b = 18.6071(6) Å, c = 7.4403(2) Å, β = 92.388(2)°, Z = 4, V = 1461.36(7) Å3, Rgt(F) = 0.032, wRref(F2) = 0.078, T = 293 K.

CCDC no.: 2262331

The crystal structure is shown in the figure. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal: Pink block
Size: 0.38 × 0.34 × 0.31 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 3.32 mm−1
Diffractometer, scan mode: SuperNova, ω-scans
θmax, completeness: 29.3°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 14,552, 3553, 0.028
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 3082
N(param)refined: 201
Programs: CrysAlisPro [1], Shelx [2, 3], Olex2 [4]
Table 2:

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

x y z Uiso*/Ueq
C1 0.8974 (3) 0.66011 (18) 0.1352 (4) 0.0263 (6)
C2 0.8284 (3) 0.71729 (16) 0.2020 (4) 0.0254 (6)
H2 0.8629 0.7632 0.2099 0.030*
C3 0.7073 (3) 0.70372 (15) 0.2560 (3) 0.0196 (5)
C4 0.7222 (3) 0.58350 (15) 0.1812 (4) 0.0216 (6)
C5 0.8440 (3) 0.59220 (17) 0.1246 (4) 0.0255 (6)
H5 0.8891 0.5535 0.0806 0.031*
C6 0.6494 (3) 0.51313 (16) 0.1732 (4) 0.0243 (6)
C7 0.6190 (3) 0.76062 (15) 0.3258 (3) 0.0216 (6)
C8 0.2174 (3) 0.6099 (2) 0.4951 (5) 0.0380 (8)
H8 0.2438 0.6533 0.5457 0.046*
C9 0.1036 (3) 0.5818 (2) 0.5444 (5) 0.0402 (8)
H9 0.0550 0.6065 0.6254 0.048*
C10 0.0607 (3) 0.51671 (18) 0.4741 (4) 0.0266 (6)
C11 0.1394 (3) 0.4836 (2) 0.3535 (4) 0.0370 (8)
H11 0.1163 0.4396 0.3027 0.044*
C12 0.2510 (3) 0.51562 (19) 0.3093 (4) 0.0342 (7)
H12 0.3007 0.4926 0.2267 0.041*
Co1 0.47380 (4) 0.62091 (2) 0.31724 (5) 0.02159 (10)
I1 1.08046 (2) 0.67667 (2) 0.05026 (3) 0.04317 (10)
N1 0.6569 (2) 0.63819 (13) 0.2456 (3) 0.0204 (5)
N2 0.2919 (2) 0.57805 (15) 0.3784 (3) 0.0283 (6)
O1 0.5140 (2) 0.73736 (11) 0.3782 (3) 0.0279 (5)
O2 0.6562 (2) 0.82359 (11) 0.3242 (3) 0.0320 (5)
O3 0.5379 (2) 0.51612 (11) 0.2317 (3) 0.0291 (5)
O4 0.7024 (2) 0.45975 (12) 0.1143 (3) 0.0350 (5)
O5 0.5185 (3) 0.60233 (14) 0.5821 (3) 0.0434 (6)
H5A 0.5995 0.6042 0.6023 0.065*
H5B 0.4996 0.5587 0.6093 0.065*
O6 0.3950 (2) 0.65407 (12) 0.0689 (3) 0.0268 (4)
H6A 0.3841 0.6176 −0.0052 0.040*
H6B 0.4478 0.6817 0.0124 0.040*

1 Source of material

The title compound was synthesized via the reaction of 4-iodopyridine-2,6-dicarboxylic acid (ipydc) (29.2 mg, 0.1 mmol), 4,4′-bipyridine (bipy) (7.8 mg, 0.05 mmol), Co(OAc)2·4H2O (24.9 mg, 0.1 mmol) in 4 mL deionized. The mixture was placed in a 23 mL Teflon liner stainless steel reactor and then heated at 343 K for three days to afford pink block crystals in a yield of 52 %.

2 Experimental details

Hydrogen atoms were placed in their geometrically idealized positions and constrained to ride on their parent atoms.

3 Discussion

Pyridine carboxylic acid and their derivatives have been widely used to construct metal compounds due to their abilities to form stable chelates [5], [6], [7], [8], [9], [10]. From a structural point of view, the 4-iodopyridine-2,6-dicarboxylic acid is a rigid multidentate ligand containing a pyridine ring and two carboxylic groups, which could be used as a terminal or bridging ligand with different coordination numbers when coordinated with central metal ions. In addition to 4-positional I atom on the pyridyl ring, 4-iodopyridine-2,6-dicarboxylic acid may take part in halogen bonding formation. So far, only few complexes involving ipydc have been reported [11, 12].

There are one crystallographically independent Co(II) ion, half a 4,4′-bipyridine ligand, one deprotonated 4-iodopyridine-2,6-dicarboxylate ligand and two coordinated water molecules in the asymmetric unit. The central Co(II) ion forms a distorted six-coordination octahedral geometry by coordinating to two N atoms (N1 and N2) of one 4-iodopyridine-2,6-dicarboxylate ligand and one 4,4′-bipyridine ligand, two oxygen atoms (O1 and O3) of one 4-iodopyridine-2,6-dicarboxylate ligand, and two oxygen atoms (O5 and O6) of two coordinated water molecules. In the compound, the Co—O distances are in the range of 2.037(2)–2.251(2) Å and the Co—N distances are 2.053(2) and 2.146(2) Å. The bond angles range from 80.04(12)° to 171.34(15)°. These values match with previously reported Co(II) compounds [13, 14].

In the compound, 4-iodopyridine-2,6-dicarboxylate ligand with a tridentate coordination mode and 4,4′-bipyridine ligand connect central Co(II) ions to generate a discrete structure. There are hydrogen bonding interactions between coordinated water molecules and carboxyl oxygen atoms from 4-iodopyridine-2,6-dicarboxylate ligands. There are halogen⃛halogen interactions (X⃛X) and halogen⃛heteroatom interactions (X⃛B). All noncovalent interactions mentioned above contribute to the formation of a supramolecular structure. Bond lengths and angles in the title structure (figure) are all in the expected ranges [15].


Corresponding author: Dong-Feng Hong, College of Food and Drug, Luoyang Normal University, Luoyang, Henan 471934, P.R. China, E-mail:

Funding source: Luoyang Normal University

Award Identifier / Grant number: DT2100009147

Award Identifier / Grant number: RH2100009357

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was supported by the grants from Luoyang Normal University (DT2100009147 and RH2100009357).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2023-05-11
Accepted: 2023-06-14
Published Online: 2023-07-04
Published in Print: 2023-10-26

© 2023 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

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