Adamantane-1-ammonium acetate.

In the title compound, C(10)H(18)N(+)·C(2)H(3)O(2) (-), the ammonium H atoms of the cation are linked to three acetate anions via N-H⋯O hydrogen bonds, forming a chain structure extending along the b axis.

Tetraaqua-tetrakis-{μ(2)-[1-(carb-oxylato-meth-yl)cyclo-hex-yl]methanaminium}bis(μ(3)-hydroxido)bis(nitrato-κO,O')tetrazinc(II).

As the title gabapentin complex, [Zn(4)(OH)(2)(NO(3))(2)(C(9)H(17)NO(2))(4)(H(2)O)(4)](NO(3))(4) is located about a centre of inversion, the asymmetric unit contains two disordered nitrate ions and half a complex mol-ecule. The two zinc ions have different coordination environments: one is slightly distorted octa-hedral and the other is trigonal-pyramidal. The conformation of the gabapentin mol-ecule is defined by the formation of two intra-molecular O-H⋯O hydrogen bonds.

[1-(Carb-oxy-meth-yl)cyclo-hex-yl]methanaminium nitrate.

The title compound, C(9)H(18)NO(2) (+)·NO(3) (-), is an anhydrous nitrate salt of gabapentin, which is formed serendipitously in the presence of selected non-coordinating metals. The crystal structure involves extensive hydrogen bonding between the -NH(3) (+) and -COOH groups and the nitrate anion.

A structural and thermal investigation of the inclusion of parabens in heptakis(2,6-di-O-methyl)cyclomaltoheptaose.

The structures of the inclusion complexes formed by heptakis(2,6-di-O-methyl)cyclomaltoheptaose and methyl-, ethyl-, propyl- and butyl parabens have been solved and analysed by X-ray diffraction. Each inclusion complex crystallises in the space group P2(1)2(1)2(1) with Z=4 and a host-to-guest ratio of 1:1. However the packing arrangements and modes of guest inclusion are not equivalent for the four structures.

Crystallization of two forms of a cyclodextrin inclusion complex containing a common organic guest.

The isolation and structural elucidation by single crystal X-ray diffraction of triclinic and monoclinic modifications of an inclusion complex of beta-cyclodextrin with the same guest, methylparaben, are reported.