European Journal of Chemistry 2017, 8(1), 33-41. doi:10.5155/eurjchem.8.1.33-41.1529

Crystal structure of 1-(4-hydroxybenzoyl)-2,7-dimethoxynaphthalene: Contribution of classical and non-classical hydrogen bonding interactions to the molecular packing structure


Akiko Okamoto (1,*) , Toyokazu Muto (2) , Siqin Gaowa (3) , Genta Takahara (4) , Noriyuki Yonezawa (5)

(1) Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan
(2) Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japany
(3) Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan
(4) Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan
(5) Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan
(*) Corresponding Author

Received: 26 Dec 2016, Accepted: 21 Jan 2017, Published: 31 Mar 2017

Abstract


Crystal structure of 1-(4-hydroxybenzoyl)-2,7-dimethoxynaphthalene, C19O4H16, is reported from the viewpoint of characteristics in the helical alignments and difference compared to the crystal structure of a structural isomeric compound. The asymmetric unit of title compound contains two conformers A and B. Furthermore, the molecules in crystal exhibit atropisomerism brought about by molecular stereogenic axis of carbon-carbon bond between the carbonyl moiety and the naphthalene ring. Therefore, a pair of R- and S-enantiomeric molecules exists for each conformer. The two pairs of the enantiomeric molecules are related by two-fold helical axis in the asymmetric unit of P21/c space group, exhibiting the number of molecules is eight, Z = 8. Single molecular structure of title compound shows non-coplanarly accumulated aromatic-rings structure. The molecular packing structure is mainly stabilized non-classical hydrogen bonds involving C-H…O hydrogen bonds and C-H…π ones, however O-H…O=C classical hydrogen bonds are solely formed between same configured conformers. Comparison with the spatial alignment of an isomeric homologue, 2-hydroxy-1-(4-methoxy benzoyl)-7-methoxynaphthalene, has clarified that substitution position of hydroxy group determines not only direction of classical hydrogen bonds but also total feature of molecular packing, i.e., the homologous compound, which has hydroxy group at 2-position of naphthalene core forms intramolecular O-H…O=C classical hydrogen bond, and O-H…OMe classical hydrogen bonds between opposite enantiomeric isomers. The presence/absence and direction of the predominantly strong classical hydrogen bonds govern balance of interactions of other less effective classical and non-classical hydrogen bonds in molecular packing. In homologous compound, each of non-classical hydrogen bonds between same signed enantiomeric isomers and those between opposite enantiomeric isomers demonstrates almost same distances. In title compound, both types of non-classical hydrogen bonds formed by conformer A are imbalanced. The imbalanced non-classical hydrogen bonds are adjusted and reinforced by non-classical hydrogen bonds between conformers A and B.


Keywords


Helical structure; Hydrogen bonds; Cooperative effect; Crystal engineering; Noncovalent interactions; X-ray single crystal structure

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DOI: 10.5155/eurjchem.8.1.33-41.1529

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[1]. Takeshi Yokoyama, Takahiro Mido, Genta Takahara, Kazuki Ogata, Elżbieta Chwojnowska, Noriyuki Yonezawa, Akiko Okamoto
Crystal structure of 1-benzoyl-2,7-dimethoxy-8-(3,5-dimethylbenzoyl) naphthalene: Head-to-head fashioned molecular motif for accumulating weak non-classical hydrogen bonds
European Journal of Chemistry  8(2), 188, 2017
DOI: 10.5155/eurjchem.8.2.188-194.1572
/


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How to cite


Okamoto, A.; Muto, T.; Gaowa, S.; Takahara, G.; Yonezawa, N. Eur. J. Chem. 2017, 8(1), 33-41. doi:10.5155/eurjchem.8.1.33-41.1529
Okamoto, A.; Muto, T.; Gaowa, S.; Takahara, G.; Yonezawa, N. Crystal structure of 1-(4-hydroxybenzoyl)-2,7-dimethoxynaphthalene: Contribution of classical and non-classical hydrogen bonding interactions to the molecular packing structure. Eur. J. Chem. 2017, 8(1), 33-41. doi:10.5155/eurjchem.8.1.33-41.1529
Okamoto, A., Muto, T., Gaowa, S., Takahara, G., & Yonezawa, N. (2017). Crystal structure of 1-(4-hydroxybenzoyl)-2,7-dimethoxynaphthalene: Contribution of classical and non-classical hydrogen bonding interactions to the molecular packing structure. European Journal of Chemistry, 8(1), 33-41. doi:10.5155/eurjchem.8.1.33-41.1529
Okamoto, Akiko, Toyokazu Muto, Siqin Gaowa, Genta Takahara, & Noriyuki Yonezawa. "Crystal structure of 1-(4-hydroxybenzoyl)-2,7-dimethoxynaphthalene: Contribution of classical and non-classical hydrogen bonding interactions to the molecular packing structure." European Journal of Chemistry [Online], 8.1 (2017): 33-41. Web. 22 Nov. 2019
Okamoto, Akiko, Muto, Toyokazu, Gaowa, Siqin, Takahara, Genta, AND Yonezawa, Noriyuki. "Crystal structure of 1-(4-hydroxybenzoyl)-2,7-dimethoxynaphthalene: Contribution of classical and non-classical hydrogen bonding interactions to the molecular packing structure" European Journal of Chemistry [Online], Volume 8 Number 1 (31 March 2017)

DOI Link: https://doi.org/10.5155/eurjchem.8.1.33-41.1529

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