1,3-Dibromo-2,4,6-trinitrobenzene (DBTNB). Crystal engineering and perfect polar alignment of two-dimensional hyperpolarizable chromophores

Abstract

1,3-Dibromo-2,4,6-trinitrobenzene (DBTNB), a two-dimensional charge transfer hyperpolarisable chromophore, crystallizes in the non-centrosymmetric space group C2 in perfect polar order leading to an intense powder SHG signal at 1.06 microns.

Structural and selectivity of 18-crown-6 ligand in lanthanide–picrate complexes

“…These approaches can be used to design molecular structure and stabilize one of the possible geometric configurations of the molecules [4]. In addition, hydrogen bonding can produce supramolecular structure [6] such as rows or helices (simulating regular polymer chains), layers, sheets and networks and induce supramolecular polar ordering [7]. These features are potentially important in several fields of material sciences [5].…”

A 19F NMR study of C–I⋯π halogen bonding

“…It is increasingly recognised that this interaction plays an important role in molecular recognition, biochemical processes and supramolecular chemistry. The applications include liquid crystals [2] and materials with specific non-linear optical [3,4] or magnetic [5,6] properties. In addition, halogen bonding plays a key role in the field of drug design [7,8] and protein-ligand complexation [9,10].…”

Hydrogen-bonded supramolecular motifs in crystal structures of trimethoprim barbiturate monohydrate (I) and 2-amino-4,6-dimethylpyrimidinium barbiturate trihydrate (II)

“…In the recent years, the search for new building blocks and structural motifs for crystal engineering has emerged as an area of intensive research [1][2][3]. The design of organic solids is based on the recognition-controlled, self-assembly of complementary molecules, and hydrogen bonding has been widely exploited for this purpose [4,5].…”