The structure Lacuna

Molecular symmetry is intimately connected with the classical concept of three-dimensional molecular structure. In a non-classical theory of wave-like interaction in four-dimensional space-time, both of these concepts and traditional quantum mechanics lose their operational meaning, unless suitably modified. A required reformulation should emphasize the importance of four-dimensional effects like spin and the symmetry effects of space-time curvature that could lead to a fundamentally different understanding of molecular symmetry and structure in terms of elementary number theory. Isolated single molecules have no characteristic shape and macro-biomolecules only develop robust three-dimensional structure in hydrophobic response to aqueous cellular media.http://www.mdpi.com/journal/ijm

1-(6-Ferrocenylhex­yl)-1H-imidazole

The title compound, [Fe(C5H5)(C14H19N2)], is characterized by a ferrocenyl group separated from an imidazole functionality by a straight-chain hexyl unit. The two cyclo­penta­dienyl rings of the ferrocenyl group show a marginal inward tilt of 2.17 (2)°. The imidazole unit, which is essentially planar (with a maximum deviation of 0.007 A for one of the N atoms) and tilted away from the ferrocenyl group [dihedral angle between the substituted ferrocenyl ring and the imidazole = 122.6 (1)°], is involved in inter­molecular C—H⋯N inter­actions

Bis(adamantan-1-aminium) carbonate

In the title compound, 2C10H18N+·CO3 2−, the adamantan-1-aminium cation forms three N—H⋯O hydrogen bonds to three carbonate ions, resulting in a layer parallel to (001) with the adamantane groups located on its surface so that adjacent layers form only C—H⋯H—C contacts. The carbonate anions occupy special positions of 32 symmetry, whereas the adamantan-1-aminium cations occupy special positions of 3 symmetry

Number theory and the periodicity of matter

Presents a fully scientific account of the use of the golden ratio and explores the observation that stable nucleides obey a number theory based general lawThe interest in number theory is worldwide and covers the entire spectrum of human knowledge. Those aspects covered here will not be immediately accessible to the general lay readership, but, scientists of all pursuations immediately appreciate the importance of the applications described hereThe well-known interest of engineers, medical practitioners and information technologists in popular scientific matters, should make this an attractive buy for such individuals. Undergraduate students in these disciplines should be equally interested

Isonicotinamide–2-naphthoic acid (1/1)

In the title 1:1 adduct, C6H6N2O·C11H8O2, the amide group is slightly twisted out of the plane of the aromatic ring, with a C—C—C—N torsion angle of 25.11 (19)°, whereas the carboxylic acid group is approximately coplanar with the bicylic ring system, with a C—C—C—O torsion angle of 10.9 (2)°. The amide groups from two isonicotinamide molecules form a dimer via N—H...O hydrogen bonds. In addition, the 2-naphthanoic acid molecule is hydrogen bonded to the pyridine unit of an isonicotinamide molecule via an O—H...N hydrogen bond. This gives rise to a centrosymmetric four-molecule chain, which is cross-linked by further N—H...O hydrogen bonds from the amide group

Pharmaceutical hydrates under ambient conditions from high-pressure seeds:A case study of GABA monohydrate

A monohydrate form of the neurotransmitter γ-amino butyric acid (GABA) has been crystallised in the 0.4–0.8 GPa pressure range, recovered to ambient pressure and then used as a seed. Theoretical calculations have been used to rationalise the experimental observations and gain an insight into thermodynamic stability.</p