Crystal structure of 1-(3-chlorophenyl)piperazin-1-ium picrate-picric acid (2/1)

Kavitha, C. N. and Jasinski, J. P. and Kaur, M. and Anderson, B. J. and Yathirajan, H. S. (2014) Crystal structure of 1-(3-chlorophenyl)piperazin-1-ium picrate-picric acid (2/1). Acta Crystallographica Section E: Crystallographic Communications, 70 (11). o1210-o1211. ISSN 2056-9890

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Abstract

The title salt {systematic name: bis­[1-(3-chloro­phen­yl)piperazinium 2,4,6-tri­nitro­phenolate]-picric acid (2/1)}, 2C10H14ClN2+·2C6H5N3O7-·C6H6N3O7, crystallized with two independent 1-(3-chloro­phen­yl)piperazinium cations, two picrate anions and a picric acid mol­ecule in the asymmetric unit. The six-membered piperazine ring in each cation adopts a slightly distorted chair conformation and contains a protonated N atom. In the picric acid mol­ecule, the mean planes of the nitro groups in the ortho-, meta-, and para-positions are twisted from the benzene ring by 31.5 (3), 7.7 (1), and 3.8 (2)°, respectively. In the anions, the dihedral angles between the benzene ring and the ortho-, meta-, and para-nitro groups are 36.7 (1), 5.0 (6), 4.8 (2)°, and 34.4 (9), 15.3 (8), 4.5 (1)°, respectively. The nitro group in one anion is disordered and was modeled with two sites for one O atom with an occupancy ratio of 0.627 (7):0.373 (7). In the crystal, the picric acid mol­ecule inter­acts with the picrate anion through a trifurcated O-H...O four-centre hydrogen bond involving an intra­molecular O-H...O hydrogen bond and a weak C-H...O inter­action. Weak inter­molecular C-H...O inter­actions are responsible for the formation of cation-anion-cation trimers resulting in a chain along [010]. In addition, weak C-H...Cl and weak [pi]-[pi] inter­actions [centroid-centroid distances of 3.532 (3), 3.756 (4) and 3.705 (3) Å] are observed and contribute to the stability of the crystal packing.

Item Type:	Article
Subjects:	C Chemical Science > Chemistry
Divisions:	Department of > Chemistry
Depositing User:	Arshiya Kousar Library Assistant
Date Deposited:	25 Jun 2019 06:27
Last Modified:	25 Jun 2019 06:27
URI:	http://eprints.uni-mysore.ac.in/id/eprint/3713

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