Home The crystal structure of [(2,2′-bipyridine-k2 N,N)-bis(6-phenylpyridine-2-carboxylate-k2 N,O)copper(II)], C34H24N4O4Cu
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The crystal structure of [(2,2′-bipyridine-k2 N,N)-bis(6-phenylpyridine-2-carboxylate-k2 N,O)copper(II)], C34H24N4O4Cu

  • Feng Yi-Min , Tai Xi-Shi ORCID logo and Xia Yu-Pei EMAIL logo
Published/Copyright: February 18, 2022

Abstract

C34H24N4O4Cu, monoclinic, C2/c (no. 15), a = 17.2931(15) Å, b = 10.3584(5) Å, c = 17.5641(16) Å, β = 120.180(12)°, V = 2719.8(5) Å3, Z = 4, R gt (F) = 0.0282, wR ref(F 2) = 0.0681, T = 199.99(10) K.

CCDC no.: 2144052

The molecular 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: Blue block
Size: 0.14 × 0.12 × 0.09 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.85 mm−1
Diffractometer, scan mode: SuperNova, ω
θ max, completeness: 25.0°, 99%
N(hkl)measured, N(hkl)unique, R int: 6381, 2368, 0.023
Criterion for I obs, N(hkl)gt: I obs > 2 σ(I obs), 2201
N(param)refined: 195
Programs: Bruker [1], CrysAlisPRO [2], Olex2 [3], SHELX [4], Diamond [5]
Table 2:

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

Atom x y z U iso*/U eq
Cu1 0.500000 0.57566 (3) 0.750000 0.02216 (11)
O1 0.36127 (10) 0.25220 (13) 0.70883 (11) 0.0391 (4)
O2 0.42283 (9) 0.44497 (12) 0.75858 (9) 0.0275 (3)
N1 0.57369 (10) 0.72313 (14) 0.74800 (10) 0.0222 (3)
N2 0.39380 (10) 0.50940 (15) 0.59600 (10) 0.0238 (3)
C1 0.38453 (12) 0.53909 (19) 0.51727 (13) 0.0266 (4)
C2 0.36522 (15) 0.4455 (2) 0.45335 (14) 0.0373 (5)
H2 0.361309 0.467595 0.400212 0.045*
C3 0.35196 (15) 0.3198 (2) 0.46951 (15) 0.0416 (6)
H3 0.338934 0.256146 0.427421 0.050*
C4 0.35822 (14) 0.2894 (2) 0.54894 (15) 0.0342 (5)
H4 0.347741 0.205658 0.560623 0.041*
C5 0.38041 (12) 0.38610 (18) 0.61069 (13) 0.0251 (4)
C6 0.38899 (13) 0.35681 (18) 0.69949 (13) 0.0267 (4)
C7 0.54308 (13) 0.84129 (17) 0.75096 (12) 0.0226 (4)
C8 0.59072 (14) 0.9520 (2) 0.75708 (13) 0.0317 (5)
H8 0.568612 1.032979 0.759100 0.038*
C9 0.67149 (15) 0.9398 (2) 0.76012 (15) 0.0395 (6)
H9 0.704456 1.012913 0.763969 0.047*
C10 0.70340 (14) 0.8190 (2) 0.75746 (14) 0.0367 (5)
H10 0.757763 0.809301 0.759262 0.044*
C11 0.65292 (13) 0.7129 (2) 0.75208 (13) 0.0294 (5)
H11 0.674625 0.631087 0.751235 0.035*
C12 0.36034 (14) 0.7711 (2) 0.53443 (13) 0.0337 (5)
H12 0.340466 0.747001 0.572719 0.040*
C13 0.39046 (13) 0.67742 (19) 0.49878 (13) 0.0284 (4)
C14 0.42071 (14) 0.7158 (2) 0.44225 (14) 0.0372 (5)
H14 0.440530 0.654206 0.417394 0.045*
C15 0.42138 (16) 0.8446 (2) 0.42301 (16) 0.0471 (6)
H15 0.442714 0.869365 0.386038 0.057*
C16 0.39102 (18) 0.9365 (2) 0.45766 (17) 0.0509 (7)
H16 0.391380 1.023087 0.443921 0.061*
C17 0.35973 (17) 0.9000 (2) 0.51327 (16) 0.0454 (6)
H17 0.338355 0.962065 0.536352 0.054*

Source of material

The mixture of 6-phenylpyridine-2-carboxylic acid (0.50 mmol, 0.0996 g), 2,2′-bipyridine (0.25 mmol, 0.039 g), NaOH (0.50 mmol, 0.020 g), and cupric acetate monohydrate (0.25 mmol, 0.0499 g) were dissolved in a 15 mL water (5 mL)-ethanol (10 mL) solution at room temperature. The blue solution gradually became cloudy. The reaction mixture was stirred for 4 h at 75 °C, cooled to room temperature and stirring was continued for 4 h. Then the solution was filtered and the filtrate was left resting for 20 days. The blue crystals of the title complex were obtained from the filtrate.

Experimental details

The hydrogen atoms were positioned geometrically (C–H = 0.93 Å). Their U iso values were set to 1.2U eq of the parent atoms.

Comment

As one of the important research contents of coordination chemistry, the complexes have been widely valued by chemists and material scientists. Because they show a rich variety of structures [6] and many applications such as antiepileptic drug, fluorescent sensor, photophysical property, anticancer property, and optical property [7], [8], [9], [10]. Previous studies from our research group showed that both 6-phenylpyridine-2-carboxylate acid and 2,2′-bipyridine are both excellent ligands. Some ternary metal complexes constructed by Pb(II), Zn(II), and Co(II) with 6-phenylpyridine-2-carboxyate acid ligand have been reported [11], [12], [13]. In order to continue our study a new Cu(II) complex [(2,2′-bipyridine-k2 N,N)-bis(6-phenylpyridine-2-carboxylate-k2 N,O)copper(II)] has been synthesized and structural characterized.

The asymmetric unit consists of one half of a Cu(II) ion, one 6-phenylpyridine-2-carboxylate ligands, and one half of a 2,2′-bipyridine ligand (see the figure). The title complex is located on a two fold axis. all ligands adopt the bis-chelating coordination mode. The coordinated environment of Cu(II) center is shown in the Figure (symmetry code: ′1−x,+y,3/2−z). The Cu(II) ion locates in a distorted octahedral geometry, defined by one O atom (O2) form one 6-phenylpyridine-2-carboxylate ligand and one N atom (N1) from 2,2′-bipyridine ligand at the axial positions (O2–Cu1–N1, 173.37(6)°), one O atom (O2′) and two N atoms (N2, N2′) form 6-phenylpyridine-2-carboxylate ligand, and one N atom (N1′) from the 2,2′-bipyridine ligand in the equatorial plane. The dihedral angle between benzene ring (C12–C13–C14–C15–C16–C17) and pyridine ring (C1–C2–C3–C4–C5–N2) of 6-phenylpyridine-2-carboxylate ligand is 33.4°. The crystal packing is stabilized by the π–π stacking to form a 3D network structure.


Corresponding author: Xia Yu-Pei, College of Chemistry and Chemical Engineering, Weifang University, Weifang, Shandong 261061, P. R. China, E-mail:

Funding source: National Natural Science Foundation of China https://doi.org/10.13039/501100001809

Award Identifier / Grant number: 21171132

Funding source: Natural Science Foundation of Shandong https://doi.org/10.13039/501100007129

Award Identifier / Grant number: ZR2014BL003

Funding source: Project of Shandong Province Higher Educational Science and Technology Program https://doi.org/10.13039/501100015642

Award Identifier / Grant number: J14LC01

Funding source: Science Foundation of Weifang

Funding source: Weifang University of Science and Technology https://doi.org/10.13039/501100010887

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

  2. Research funding: This project was supported by the National Natural Science Foundation of China (No. 21171132), the Natural Science Foundation of Shandong (ZR2014BL003), the Project of Shandong Province Higher Educational Science and Technology Program (J14LC01) and Science Foundation of Weifang.

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

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Received: 2021-12-23
Accepted: 2022-01-24
Published Online: 2022-02-18
Published in Print: 2022-04-26

© 2022 Feng Yi-Min et al., published by De Gruyter, Berlin/Boston

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

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