Synthesis and an Evaluation of Molecular Conformation and Crystal Packing in Two Substituted 4-Phenylquinolines

Sarveswari, S and Prasath, R and Mathew, PS and Chopra, Deepak and Narasimhamurthy, T and Vijayakumar, V (2012) Synthesis and an Evaluation of Molecular Conformation and Crystal Packing in Two Substituted 4-Phenylquinolines. In: JOURNAL OF CHEMICAL CRYSTALLOGRAPHY, 42 (6). pp. 583-587.

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Abstract

The title compounds, namely Methyl 2-methyl-4 -phenylquinoline-3-carboxylate (I), C18H15NO2, and (2E)-3-(3,4-dimethoxyphenyl)-1-(2-methyl-4 -phenylquinolin-3-yl)prop-2-en-1-one (II), C27H23NO3, comprising of the phenyl ring, exhibit differences in conformational behaviour with respect to the plane of the quinoline fragment. (I) contains the methyl ester moiety whereas (II) contains the chalcone fragment, consisting of a double bond and phenyl group containing dimethoxy groups as substituents. The dihedral angles between the phenyl group and the quinoline ring is 82.77 (7)A degrees in (I), and 79.02 (8)A degrees in (II) respectively. It is the weak C-H center dot center dot center dot O=C H-bond and C-H center dot center dot center dot pi interactions which dictate packing of molecules in (I). In (II), it is C-H center dot center dot center dot N and C-H center dot center dot center dot pi, involving the dimethoxy ring, which controls packing of molecules in the crystal lattice. In addition, pi center dot center dot center dot pi aromatic stacking interactions involving the quinoline fragment is present in all the molecules. The title compounds, namely methyl-2-methyl-4 -phenylquinoline-3-carboxylate (I), C18H15NO2, and (2E)-3-(3,4-dimethoxyphenyl)-1-(2-methyl-4 -phenylquinolin-3-yl)prop-2-en-1-one (II), C27H23NO3, comprising of the phenyl ring, exhibit differences in conformational behaviour with respect to the plane of the quinoline fragment. (I) contains the methyl ester moiety whereas (III) contains the chalcone fragment, consisting of a double bond and phenyl group containing dimethoxy groups as substituents. The dihedral angles between the phenyl group and the quinoline ring is 82.77 (7)A degrees in (I), and 79.02 (8)A degrees in (II) respectively. It is the weak C-H center dot center dot center dot O=C H-bond and C-H center dot center dot center dot pi interactions which dictate packing of molecules in (I). In (II), it is C-H center dot center dot center dot N and C-H center dot center dot center dot pi, involving the dimethoxy ring, which controls packing of molecules in the crystal lattice. In addition, pi center dot center dot center dot pi aromatic stacking interactions involving the quinoline fragment is present in all the molecules.

Item Type:	Journal Article
Publication:	JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
Publisher:	SPRINGER/PLENUM PUBLISHERS
Additional Information:	Copyright for this article belongs toSpringer
Keywords:	Phenylquinolines;Molecular conformation; Intermolecular interactions;Hydrogen bonds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	14 Jul 2012 06:59
Last Modified:	16 Jul 2012 11:16
URI:	http://eprints.iisc.ac.in/id/eprint/44684

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