Synthesis and Self-Assemblies of Bithiophene Functionalized 1H-Pyrazole Derivatives

Abstract

these suprastructural entities are built from small molecular building blocks, connected via various secondary intermolecular forces. These include, without limitations, hydrogen bonding, electrostatic, hydrophobic, electron donor-acceptor, π−π, CH−π, and Van der Waals interactions. It is thus well recognized nowadays that the strength, directionality, and reversibility offered by these secondary interactions between discrete molecular building blocks are responsible for controlling molecular self-assemblies as well as their functionalities. Among various types of non-covalent intermolecular interactions, the hydrogen bond is one of the most important and pervasive intermolecular forces playing a key role in determining and controlling the assembly of many biological and artificial functional materials. 5-7 Among a variety of hydrogen-bonding functional groups, 1H-pyrazole derivatives are a class of five-membered nitrogen heterocyclic ring compounds, containing a hydrogenbond donor (N-H) and acceptor (N) in adjacent positions. In recent years, growing interest has been paid to studies on self-assemblies of a variety of pyrazole derivatives involving directional inter- and intra-molecular hydrogen bonding