Home Crystal structure of (E)-N-(4-morpholinophenyl)-1-(quinolin-2-yl)methanimine, C20H19N3O
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Crystal structure of (E)-N-(4-morpholinophenyl)-1-(quinolin-2-yl)methanimine, C20H19N3O

  • Kun-Sheng Jin and Wei-Na Wu ORCID logo EMAIL logo
Published/Copyright: September 26, 2022

Abstract

C20H19N3O, orthorhombic, P212121 (no. 19), a = 5.8776(10) Å, b = 7.6503(13) Å, c = 36.447(6) Å, V = 1638.8(5) Å3, Z = 4, Rgt (F) = 0.0374, wRref (F 2) = 0.0950, T = 296 K.

CCDC no.: 2180391

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: Yellow plate
Size 0.20 × 0.12 × 0.04 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.08 mm−1
Diffractometer, scan mode: φ and ω
θ max, completeness: 25.0°, >99%
N(hkl)measured , N(hkl)unique, R int: 8371, 2872, 0.036
Criterion for I obs, N(hkl)gt: I obs > 2 σ(I obs), 2252
N(param)refined: 218
Programs: SHELX [1], Bruker [2]
Table 2:

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

Atom x y z U iso /U eq
O1 0.0505 (3) 0.6194 (3) 0.10134 (5) 0.0571 (6)
C1 0.3997 (5) 0.5448 (3) 0.44413 (6) 0.0427 (6)
C2 0.2859 (5) 0.4431 (4) 0.47059 (7) 0.0564 (8)
H2A 0.148077 0.390369 0.464690 0.068
C3 0.3752 (6) 0.4212 (4) 0.50458 (7) 0.0631 (9)
H3A 0.298224 0.353727 0.521801 0.076
C4 0.5819 (6) 0.4992 (4) 0.51390 (7) 0.0589 (8)
H4A 0.641650 0.483594 0.537305 0.071
C5 0.6957 (5) 0.5972 (4) 0.48911 (7) 0.0529 (7)
H5A 0.833543 0.648178 0.495602 0.064
C6 0.6082 (5) 0.6230 (3) 0.45362 (6) 0.0427 (6)
C7 0.7177 (5) 0.7241 (4) 0.42643 (7) 0.0534 (7)
H7A 0.853906 0.780604 0.431706 0.064
C8 0.6240 (5) 0.7386 (4) 0.39276 (7) 0.0526 (7)
H8A 0.695641 0.804148 0.374651 0.063
C9 0.4161 (5) 0.6532 (3) 0.38527 (6) 0.0437 (7)
C10 0.3145 (5) 0.6588 (3) 0.34881 (7) 0.0498 (7)
H10A 0.176410 0.602592 0.344815 0.060
C11 0.3164 (5) 0.7359 (3) 0.28654 (6) 0.0411 (6)
C12 0.1157 (5) 0.6556 (4) 0.27595 (7) 0.0506 (7)
H12A 0.025914 0.601195 0.293578 0.061
C13 0.0468 (5) 0.6547 (3) 0.24003 (6) 0.0481 (7)
H13A −0.088447 0.599034 0.233779 0.058
C14 0.1753 (4) 0.7355 (3) 0.21257 (6) 0.0373 (6)
C15 0.3730 (4) 0.8197 (3) 0.22364 (6) 0.0464 (7)
H15A 0.461289 0.877127 0.206231 0.056
C16 0.4415 (5) 0.8201 (3) 0.25974 (7) 0.0469 (7)
H16A 0.574581 0.878118 0.266229 0.056
C17 0.2868 (5) 0.7459 (4) 0.14848 (6) 0.0623 (8)
H17A 0.382376 0.643019 0.150501 0.075
H17B 0.380250 0.847509 0.153652 0.075
C18 0.1963 (5) 0.7588 (5) 0.11009 (7) 0.0658 (9)
H18A 0.114437 0.868111 0.107357 0.079
H18B 0.322807 0.759903 0.092989 0.079
C19 −0.0616 (5) 0.6034 (4) 0.16522 (7) 0.0507 (7)
H19A −0.193016 0.612209 0.181217 0.061
H19B 0.004355 0.488182 0.168439 0.061
C20 −0.1365 (5) 0.6251 (4) 0.12588 (6) 0.0549 (8)
H20A −0.242876 0.532802 0.119655 0.066
H20B −0.214594 0.736027 0.123193 0.066
N1 0.3056 (4) 0.5598 (3) 0.40994 (5) 0.0484 (6)
N2 0.4092 (4) 0.7380 (3) 0.32243 (5) 0.0472 (6)
N3 0.1045 (4) 0.7354 (3) 0.17549 (5) 0.0394 (5)

Source of material

Quinoline-2-carbaldehyde (0.157 g, 1 mmol) and 4-morpholin-4-yl-phenylamine (0.178 g, 1 mmol) were dissolved in ethanol (10 mL). The mixture was stirred for 1 h under refluxing. The resulting solution was left in air for a few days, yielding yellow plate crystals.

Experimental details

The structure was solved by direct methods and refined with the SHELX crystallographic software package [1]. The hydrogen atoms were placed at calculated positions and refined as riding atoms with constrained isotropic displacement parameters.

Comment

Schiff bases bearing quinoline units have been extensively investigated due to their excellent chelate ability [3, 4]. In this regard, several quinoline-containing Schiff bases. have been developed as probes for the fluorescent detection of metal ions [5], [6], [7]. As part of our ongoing studies on fluorescent probes, the title compound was synthesized and characterized by X-ray diffraction.

In the title structure (see the Figure), the bond length of the imine moiety C10–N2 is 1.265(3) Å, clearly indicating the Schiff base formation [8]. The quinoline ring (r.m.s. deviation 0.0092 Å) and benzene ring (r.m.s. deviation 0.0080 Å) are almost coplanar, with the dihedral angle of 9.1°. As expected, there exist no classical hydrogen bonds, while the weak C4–H4A…O1 i (symmetry code i: 0.5 − x, 1 − y, 0.5 + z) hydrogen bonds link the moledules into an one-dimensional chain along c axis.


Corresponding author: Wei-Na Wu, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454000, P. R. China, E-mail:

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 21907023

Award Identifier / Grant number: 21001040

Funding source: Joint Program for Fostering Talents of National Natural Science Foundation of China and Henan Province

Award Identifier / Grant number: U1304202

Award Identifier / Grant number: 212102210033

Award Identifier / Grant number: 212102310388

Award Identifier / Grant number: 222102320069

Award Identifier / Grant number: 222300420523

Award Identifier / Grant number: 2022CXTD001

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

  2. Research funding: National Natural Science Foundation of China (No. 21907023 and 21001040), the Joint Program for Fostering Talents of National Natural Science Foundation of China and Henan Province (No. U1304202), the Science and Technology Department of Henan Province (No. 212102210033, 212102310388, 222102320069 and 222300420523), and Key Program of Xuchang University (2022CXTD001).

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

References

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Received: 2022-04-30
Accepted: 2022-06-20
Published Online: 2022-09-26
Published in Print: 2022-12-16

© 2022 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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