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Open Access Zwitterionic 1-{(1E)-[(4-hydroxyphenyl)iminio]methyl}naphthalen-2-olate: crystal structure and Hirshfeld surface analysis

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The title zwitterion, C17H13NO2 (systematic name: 1-{(1E)-[(4-hydroxyphenyl)iminiumyl]methyl}naphthalen-2-olate), features an intramolecular charge-assisted N+—H...O− hydrogen bond. A twist in the molecule is evident around the N—C(hydroxybenzene) bond [C—N—C—C torsion angle = 39.42 (8)°] and is reflected in the dihedral angle of 39.42 (8)° formed between the aromatic regions of the molecule. In the crystal, zigzag supramolecular chains along the a axis are formed by charge-assisted hydroxy-O—H...O(phenoxide) hydrogen bonding. These are connected into a layer in the ab plane by charge-assisted hydroxybenzene-C—H...O(phenoxide) interactions and π–π contacts [inter-centroid distance between naphthyl-C6 rings = 3.4905 (12) Å]. Layers stack along the c axis with no specific interactions between them. The Hirshfeld surface analysis points to the significance C...H contacts between layers.
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Document Type: Research Article

Affiliations: 1: Research & Development Centre, Bharathiar University, Coimbatore 641 046, India 2: Govt. Science College, Nrupathunga Road, Bangalore 560 001, India 3: SSMRV College, Jayanagar 4th T block, Bangalore 560 041, India 4: Department of Physics, Bhavan's Sheth R. A. College of Science, Ahmedabad, Gujarat 380 001, India 5: Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia

Publication date: January 1, 2017

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