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In the crystal structure of the title compound, C4H13N52+·2NO3, the main inter­molecular inter­actions are the N—H...O hydrogen bonds between the cationic amino groups and the O atoms of the nitrate ions. All amino H atoms and nitrate O atoms are involved in the three-dimensional hydrogen-bond network. There are two graph-set motifs R22(8), which include the amino groups connected to the N atoms in the biguanide 3-, 4- and 5-positions, and the O atoms of a nitrate ion. They are extended along the a axis. An O atom of the second nitrate ion is involved in a graph-set motif C(4) that is a part of a helix-like N—H...O...H—N—H...O... chain oriented along the b axis. There are also two weak C—H...O inter­actions in the crystal structure.

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In the title compound, C90H120O18·2CH3CN, the calix[6]arene has a 1,2,3-alternate conformation and possesses inversion symmetry. It crystallizes as an acetonitrile disolvate, with a half-mol­ecule of calix[6]arene and one mol­ecule of solvent in the asymmetric unit. In the crystal, the two solvent mol­ecules are enclosed in voids between the calix[6]arene mol­ecules. They form weak C—H...O hydrogen bonds involving an O atom of the lower rim substituent. The cavity of the calix[6]arene itself is enclosed by two opposite phenol rings, which are turned into the cavity due to the presence of a C—H...π inter­action. The calix[6]arene mol­ecule exhibits disorder of one substituent on its lower rim [occupancy ratio 0.897 (3):0.103 (3)].

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In the crystal of the title compound, C7H7NO3, mol­ecules associate into infinite chains via O—H...O(NO2) hydrogen bonds propagating in the [101] direction. These chains are linked via C—H...O(NO2) hydrogen bonds to form double-stranded ribbons lying parallel to the ac plane. The ribbons stack along the b axis by means of π–π inter­actions involving the benzene rings and the nitro group. The centroid–centroid distances of the alternating parallel aromatic rings are 3.6514 (7) and 3.8044 (7) Å.
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