Home The crystal structure of (E)-1-(((2-amino-4,5-dimethylphenyl)iminio)methyl)naphthalen-2-olate, C19H18N2O
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The crystal structure of (E)-1-(((2-amino-4,5-dimethylphenyl)iminio)methyl)naphthalen-2-olate, C19H18N2O

  • Hai-Lin Xiong ORCID logo EMAIL logo , Jian-Guo Zhang and Hao Zou ORCID logo
Published/Copyright: March 26, 2024

Abstract

C19H18N2O, orthorhombic, Pna21 (no. 33), a = 21.838(2) Å, b = 13.9663(11) Å, c = 4.9806(4) Å, V = 1519.1(2) Å3, Z = 4, R gt(F) = 0.0702, wR ref(F 2) = 0.1948, T = 293 K.

CCDC no.: 2322687

The title 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: Brown needle
Size: 0.12 × 0.04 × 0.03 mm
Wavelength: CuKα radiation (1.54184 Å)
μ: 0.62 mm−1
Diffractometer, scan mode: XtaLAB Synergy, ω
θ max, completeness: 66.6°, 98 %
N(hkl)measured, N(hkl)unique, R int: 7072, 2424, 0.129
Criterion for I obs, N(hkl)gt: I obs > 2 σ(I obs), 1569
N(param)refined: 207
Programs: CrysAlis PRO [1], Olex2 [2], Shelx [3, 4]
Table 2:

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

Atom x y z U iso*/U eq
C1 0.6439 (3) 0.7611 (6) 1.2285 (16) 0.086 (2)
H1C 0.628898 0.748791 1.406264 0.129*
H1D 0.665852 0.820718 1.226991 0.129*
H1E 0.670890 0.710298 1.174917 0.129*
C2 0.5567 (3) 0.6000 (5) 1.1647 (15) 0.083 (2)
H2A 0.552583 0.614584 1.352202 0.124*
H2B 0.596085 0.571929 1.132238 0.124*
H2C 0.525187 0.555794 1.112484 0.124*
C3 0.5911 (3) 0.7667 (5) 1.0369 (13) 0.0659 (17)
C4 0.5505 (3) 0.6908 (4) 1.0030 (13) 0.0619 (16)
C5 0.5027 (3) 0.7004 (5) 0.8249 (13) 0.0601 (15)
H5 0.474743 0.650580 0.807876 0.072*
C6 0.4949 (2) 0.7821 (4) 0.6701 (13) 0.0559 (14)
C7 0.5357 (2) 0.8591 (4) 0.6972 (14) 0.0588 (14)
C8 0.5831 (3) 0.8488 (5) 0.8841 (14) 0.0699 (17)
H8 0.610471 0.899184 0.906734 0.084*
C9 0.4155 (2) 0.7227 (4) 0.3783 (13) 0.0579 (14)
H9 0.424024 0.660559 0.434215 0.069*
C10 0.3696 (2) 0.7355 (4) 0.1853 (13) 0.0533 (13)
C11 0.3579 (3) 0.8289 (4) 0.0851 (13) 0.0610 (16)
C12 0.3150 (3) 0.8401 (5) −0.1271 (15) 0.0720 (17)
H12 0.307527 0.900891 −0.196126 0.086*
C13 0.2849 (3) 0.7644 (5) −0.2301 (14) 0.073 (2)
H13 0.257882 0.774021 −0.371846 0.088*
C14 0.2933 (3) 0.6700 (5) −0.1286 (13) 0.0603 (15)
C15 0.3362 (2) 0.6542 (4) 0.0759 (11) 0.0528 (13)
C16 0.3435 (3) 0.5606 (4) 0.1707 (15) 0.0687 (17)
H16 0.372007 0.548433 0.305248 0.082*
C17 0.3096 (3) 0.4867 (5) 0.0693 (16) 0.081 (2)
H17 0.314721 0.425355 0.138165 0.098*
C18 0.2682 (3) 0.5023 (6) −0.1332 (17) 0.086 (2)
H18 0.246016 0.451231 −0.203426 0.104*
C19 0.2594 (3) 0.5920 (6) −0.2315 (16) 0.081 (2)
H19 0.230958 0.602164 −0.367467 0.097*
N1 0.5290 (3) 0.9418 (4) 0.5501 (13) 0.0726 (15)
H1A 0.510 (3) 0.939 (5) 0.392 (17) 0.087*
H1B 0.565 (3) 0.986 (5) 0.574 (15) 0.087*
N2 0.44696 (19) 0.7920 (3) 0.4840 (10) 0.0582 (13)
H2 0.437572 0.849295 0.435664 0.070*
O1 0.38511 (19) 0.9036 (3) 0.1814 (11) 0.0754 (13)

1 Source of materials

2-Hydroxy-1-naphthaldehyde (0.02 mol 3.4436 g), sodium bisulfite (0.03 mol 3.1215 g) and 4,5-dimethylbenzene-1,2-diamine (0.06 mol 8.172 g) were suspended in methanol (70 g). Under nitrogen atmosphere, the suspension was stirred at 60 °C for 24 h. The mixture was cooled to room temperature, filtered, concentrated under pressure and purified by silica gel column chromatography (hexane : ethyl acetate = 2:1, v/v, R f  = 0.83). Crystals of the title compound were obtained by slow evaporation of the elution of the target at room temperature.

2 Experimental details

Absorption corrections were used by using multi-scan program [1]. The structure was solved with Olex2 and Shelx [2], [3], [4]. Hydrogen atoms were placed in their geometrically idealized positions. Hydrogen atoms were constrained to ride on their parent atoms.

3 Comment

Schiff bases are a class of compounds formed by double bonding between carbon atoms and nitrogen atoms, their excellent coordination structure main due to the presence of C=N in the structure [5]. Schiff bases are widely used in the construction of coordination compounds [6]. Schiff bases and their metal complexes have different application prospects in magnetic material, catalysis, analytical chemistry, medicine, new energy materials, luminescence, or other fields [7, 8].

The title molecule in the crystal structure is a flexible molecule and each title molecule contains one phenyl ring, one naphthyl ring and one C=N double bond. From the data of bond length and bond angle of the title Schiff base compound, it can be seen that the C=N double bond length N2⋯C9 in Schiff base is 1.299(7) Å, which is similar to the average bond length of the usual C=N double bond [9]. In the title molecule, the C–C distances are in the range of 1.346(9) to 1.508(9) Å, the C–N distances are in the range of 1.375(8) to 1.405(7) Å, the C=O distance is 1.293(7) Å.

In addition, there are one intermolecular C–H⋯π interaction among the aromatic rings from neighboring molecules. The C–H⋯π interaction is C1–H1C⋯Cg i (C3–C8; symmetry code i: x, y, 1 + z), the shortest distance between H1C and center of Cg1 i is 2.93 Å [10]. Also the crystal packing is consolidated by hydrogen bond interactions. The first hydrogen bond is N1–H1A⋯N1, the distance of H1A⋯N1 bond is 2.53(8) Å, the angle of N1–H1A⋯N1 is 136(6)°. The second hydrogen bond is N1–H1B⋯O1, the distance of H1B⋯O1 bond is 1.96(7) Å, the angle of N1–H1B⋯O1 is 161(5)° [11]. The third hydrogen bond is N2–H2⋯O1, the distance of H1B⋯O1 bond is 1.87 Å, the angle of N2–H2⋯O1 is 135°, its intramolecular hydrogen bond. The fourth hydrogen bond is N2–H2⋯N1, the distance of H1B⋯O1 bond is 2.45 Å, the angle of N2–H2⋯N1 is 103°, its intramolecular hydrogen bond [12]. In general all geometric parameters are in the expected ranges [13].


Corresponding author: Hai-Lin Xiong, Simulation and Reliability Laboratory, CSSC (Chongqing) Southwest Equipment Research Institute Co., Ltd, Yubei, Chongqing, 401120, P.R. China, E-mail:

Award Identifier / Grant number: No. 21171132

Funding source: Science Foundation of Weifang

Award Identifier / Grant number: (2020ZJ1054)

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

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

  3. Research funding: This work was supported by the National Natural Science Foundation of China (No. 21171132, https://doi.org/10.13039/501100001809), and Science Foundation of Weifang (2020ZJ1054).

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Received: 2024-01-31
Accepted: 2024-03-01
Published Online: 2024-03-26
Published in Print: 2024-06-25

© 2024 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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