Crystallography in Structural Chemistry

Abstract

This anniversary article has three functions: It marks Volume 25 of our journal; it honors 2014, the International Year of Crystallography; and it celebrates the centennial from the birth of a great crystallographer, Aleksandr I. Kitaigorodskii.

Tiling approach for the description of the sevenfold symmetry in quasicrystals

“…Our results may stimulate further research in various fields of generalized crystallography including scale and superspace crystallography [41][42][43][44][45]. We expect that our mathematical models will help researchers to better understand the ordering phenomena in soft matter and relating materials, to explain the appearance of anomalous symmetries in colloidal layers, and to design new types of photonic crystals, artificial solids, metamaterials, and so forth [46][47][48][49][50][51][52][53].…”

Tunable Mechanical Response from a Crystal Undergoing Topochemical Dimerization: Instant Explosion at a Faster Rate and Chemical Storage of a Harvestable Explosion at a Slower Rate

“…Acomparison of the crystal structures of monomer 1 and dimer 2 reveals that the monomer molecules in the noncovalent centrosymmetric dimer move closer by approximately 1 during the reaction (Supporting Information, Section 9, Figure S6) and this generates free space (cavity) in the crystal lattice (Supporting Information, Figure S6). Crystals in general prefer close packing [13] and the empty volume generated as ar esult of the reaction causes strain in the crystals.F urthermore,t he heat liberated owing to the exothermic reaction contributes to the overall strain. The fate of the reacting crystal depends on the rate of the reaction (heating rate).…”

Tunable Mechanical Response from a Crystal Undergoing Topochemical Dimerization: Instant Explosion at a Faster Rate and Chemical Storage of a Harvestable Explosion at a Slower Rate

“…A comparison of the crystal structures of monomer 1 and dimer 2 reveals that the monomer molecules in the non‐covalent centrosymmetric dimer move closer by approximately 1 Å during the reaction (Supporting Information, Section 9, Figure S6) and this generates free space (cavity) in the crystal lattice (Supporting Information, Figure S6). Crystals in general prefer close packing and the empty volume generated as a result of the reaction causes strain in the crystals. Furthermore, the heat liberated owing to the exothermic reaction contributes to the overall strain.…”