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The title compound, [Cu2Cl4(C7H8N2O)2], crystallizes as discrete [CuLCl2]2 (L = 2-amino­benzamide) dimers with inversion symmetry. Each CuII ion is five-coordinated and is bound to two bridging chloride ligands, a terminal chloride ligand and a bidentate 2-amino­benzamide ligand. The crystal structure exhibits alternating layers parallel to (010) along the b-axis direction. In the crystal, the components are linked via N—H...Cl hydrogen bonds, forming a three-dimensional network. These inter­actions link the mol­ecules within the layers and also link the layers together and reinforce the cohesion of the structure.

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In the crystal structure of the title salt hydrate, C9H8NO+·HSO4·H2O, the quinoline N—H atoms are hydrogen bonded to the bis­ulfate anions. The bis­ulfate anions and water mol­ecules are linked together by O—H...O hydrogen-bonding inter­actions. The cations and anions form separate layers alternating along the c axis, which are linked by N—H...O and O—H...O hydrogen bonds into a two-dimensional network parallel to (100). Further O—H...O contacts connect these layers, forming a three-dimensional network, in which two R44(12) rings and C22(13) infinite chains can be identified.

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In the title Schiff base salt, C16H13N2O+·ClO4, the pyridine ring and the naphthalene ring system are approximately co-planar [making a dihedral angle of 6.05 (12)°] and an intra­molecular O—H...N hydrogen bond occurs between the hydroxyl and imino groups. In the crystal, the cations and anions are linked by N—H...O and weak C—H...O hydrogen bonds, forming the supra­molecular layers parallel to (100). The crystal studied was an inversion twin refined with minor component = 0.43 (13).
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