Home The crystal structure of tris(6-methylpyridin-2-yl)phosphine oxide, C18H18N3OP
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The crystal structure of tris(6-methylpyridin-2-yl)phosphine oxide, C18H18N3OP

  • Gui-Ling Wu ORCID logo EMAIL logo
Published/Copyright: May 10, 2022

Abstract

C18H18N3OP, monoclinic, P21/n (no. 14), a = 13.3987(17) Å, b = 8.7084(11) Å, c = 14.5063(18) Å, β = 95.849(2)° V = 1683.8(4) Å3, Z = 4, R gt (F) = 0.0423, wR ref (F2) = 0.1311, T = 296(2) K.

CCDC no.: 2167365

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: Block, clear light colourless
Size: 0.20 × 0.20 × 0.15 mm
Wavelength: MoKα radiation (0.71073 Å)
μ: 0.17 mm−1
Diffractometer, scan mode: Bruker APEX-II, φ and ω-scans
θmax, completeness: 30°, >99%
N(hkl)measured, N(hkl)unique, Rint: 17391, 4874, 0.026
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 4110
N(param)refined: 211
Programs: Bruker programs [1], OLEX [2], SHELX [3, 4]
Table 2:

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

x y z Uiso*/Ueq
N1 0.28517 (8) 0.30445 (13) 0.01985 (8) 0.0338 (2)
N2 0.36249 (9) 0.72363 (14) 0.16337 (8) 0.0383 (3)
N3 0.24404 (9) 0.72964 (12) −0.11779 (8) 0.0357 (2)
O1 0.12973 (7) 0.68199 (12) 0.05029 (8) 0.0422 (2)
P1 0.22329 (2) 0.59414 (3) 0.04377 (2) 0.02815 (11)
C1 0.20237 (9) 0.39276 (13) 0.01454 (9) 0.0295 (2)
C2 0.10769 (10) 0.33947 (16) −0.01556 (10) 0.0379 (3)
H2 0.052390 0.404546 −0.019349 0.045*
C3 0.09743 (11) 0.18528 (18) −0.04007 (11) 0.0435 (3)
H3 0.034669 0.145247 −0.060366 0.052*
C4 0.18077 (11) 0.09306 (16) −0.03401 (11) 0.0414 (3)
H4 0.175008 −0.010401 −0.049524 0.050*
C5 0.27455 (10) 0.15616 (15) −0.00425 (10) 0.0367 (3)
C6 0.36779 (14) 0.0606 (2) 0.00085 (17) 0.0621 (5)
H6A 0.425473 0.126482 0.004285 0.093*
H6B 0.366476 −0.002734 −0.053450 0.093*
H6C 0.371224 −0.003415 0.054976 0.093*
C7 0.30736 (10) 0.59480 (14) 0.15027 (8) 0.0316 (3)
C8 0.30791 (12) 0.47758 (18) 0.21485 (10) 0.0428 (3)
H8 0.267230 0.391623 0.203918 0.051*
C9 0.37124 (14) 0.4924 (2) 0.29667 (11) 0.0539 (4)
H9 0.373590 0.416472 0.341936 0.065*
C10 0.43009 (14) 0.6211 (2) 0.30918 (11) 0.0526 (4)
H10 0.474625 0.631459 0.362336 0.063*
C11 0.42312 (12) 0.73576 (19) 0.24254 (10) 0.0446 (3)
C12 0.48210 (18) 0.8826 (2) 0.25702 (15) 0.0689 (6)
H12A 0.517013 0.902554 0.203683 0.103*
H12B 0.529713 0.872717 0.310812 0.103*
H12C 0.437178 0.965946 0.265807 0.103*
C13 0.29749 (9) 0.65975 (13) −0.04709 (8) 0.0293 (2)
C14 0.39914 (11) 0.62984 (18) −0.04539 (10) 0.0406 (3)
H14 0.434084 0.582368 0.005509 0.049*
C15 0.44766 (12) 0.6725 (2) −0.12168 (12) 0.0486 (4)
H15 0.515656 0.652643 −0.123318 0.058*
C16 0.39368 (14) 0.74414 (18) −0.19411 (11) 0.0482 (4)
H16 0.424722 0.773580 −0.245820 0.058*
C17 0.29182 (13) 0.77306 (16) −0.19036 (10) 0.0438 (3)
C18 0.2302 (2) 0.8554 (3) −0.26712 (14) 0.0754 (6)
H18A 0.192526 0.782029 −0.305905 0.113*
H18B 0.273634 0.912121 −0.303350 0.113*
H18C 0.184853 0.924874 −0.241239 0.113*

Source of materials

A mixture of 2-bromo-6-methylpyridine (30 mmol), red phosphorus (30 mmol) and powdered KOH (30 mmol), DMSO (20 mL), and H2O (1 mL) was stirred for 1 h at 120 °C under argon. The mixture was cooled to room temperature, diluted with H2O (40 mL) and extracted with CHCl3 (3 × 20 mL). The combined extract was washed with H2O (3 × 20 mL) and dried over Mg2SO4. The solvent was removed under reduced pressure and a microcrystalline powder was obtained. The aforementioned solid (4 mmol) was dissolved in toluene (30 mL) and H2O2 solution (2.0 mL) was added. The reaction solution was stirred at room temperature for 2 h. After completion of the reaction, the solvent was removed in vacuo and the crude product was triturated with isopropanol (10 mL). After drying in vacuo, a colorless powder was obtained in 86% yield.

Experimental details

Coordinates of hydrogen atoms were added using standard options of the SHELX system [3, 4]. Their Uiso values were set to 1.2Ueq of the parent atoms.

Comment

Over the last decade, pyridylphosphine ligands have attracted attention for the design of transition metal complexes which demonstrate extraordinary coordination behavior and catalytic activity. The ability of such ligands to coordinate to a catalytically active transition metal via the phosphorus atom makes them ideal for constructing metallic and heterometallic architectures [5], [6], [7]. Tris(2-pyridyl)phosphine exhibits rich coordination capabilities owing to its unique structure. On the other hand, there are many studies on the substitution of pyridine-4-yl substituents in the substituents of tris(2-pyridyl)phosphine [8, 9]. A typical side-product of many reactions are the corresponding Phosphine oxides like the title compound.

The title compound crystallizes in the monoclinic space group P21/n (no. 14) with four molecules in the unit cell. The P–O bond distance, 1.4798(9) Å, is comparable with similar structures found in the literature showing typical double bond character [810]. The pyridine ring (N1/C1–C5) makes dihedral angles of 60.54(7)° and 80.96(7)° with the other two pyridine rings (N2/C7–C11 and N3/C13–C17), respectively. In addition, the crystal structure exhibits weak C–H⃛π interactions. [C(6)–H(6B)⃛Cg3′ = 2.75 (4) Å; Cg3 is the centroid of pyridine ring (N3, C13, C14, C15, C16, C17); ′ = x, −1 + y, z].


Corresponding author: Gui-Ling Wu, Department of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, P. R. China, E-mail:

Funding source: Qiannan Normal University for Nationalities

Award Identifier / Grant number: qnsy2017002

Funding source: Scientific and Technological Project for Agriculture of Qiannan

Award Identifier / Grant number: Qiannankehe[2018]12

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

  2. Research funding: The authors is grateful to the projects of Qiannan Normal University for Nationalities (qnsy2017002) and the Scientific and Technological Project for Agriculture of Qiannan (Qiannankehe[2018]12) for financial support.

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

References

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Received: 2022-03-21
Accepted: 2022-04-19
Published Online: 2022-05-10
Published in Print: 2022-08-26

© 2022 Gui-Ling Wu, published by De Gruyter, Berlin/Boston

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

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