Simple aromatic ring

Abstract: The cation-π effect is the stabilizing interaction between a cation and the electron-rich face of an aromatic ring. Studies of synthetic receptor systems in aqueous and organic media have established that the effect can produce strong binding of a wide range of cationic guests. Computational studies indicate that the effect is largely electrostatic in origin, suggesting that it is appropriate to consider the face of a simple aromatic ring as a pseudoanion. However, this pseudoanion is fundamentally hydrophobic. Nature exploits this structure in delineating binding sites for a number of neurotransmitters such as acetylcholine. In addition, computational studies have led to a novel mechanism for ion selectivity in voltage-gated K+ channels, in which cation-π interactions play a key role.

Abstract: The title compound, C20H16N2S, was synthesized, and the structure was investigated by X-ray crystallography and characterised by NMR and IR spectroscopy. The compound crystallizes in the orthorhombic crystal class in the space group F2dd with cell parameters a = 6.1830(5)A, b = 27.797(5)A, c = 38.234(7) and Z = 16. Pyrazole refers both to the class of simple aromatic ring organic compounds of the heterocyclic diazole series, characterized by a 5-membered ring structure composed of three carbon atoms and two nitrogen atoms in adjacent positions, and to the unsubstituted parent compound. Being so composed and having pharmacological effects on humans, they are classified as alkaloids, although they are rare in nature. The pyrazole ring is widely found as the core structure in a large variety of compounds that possess important agrochemical and pharmaceutical activities.1,2 Pyrazole derivatives are well known for analgesic, and antidiabetic activities.3-5 Numerous compounds containing the pyrazole moiety exhibit a wide range of biological activities, such as anti-inflammatory,6 antimicrobial,7 and antiviral8 properities. In this context, and as a part of our ongoing research on pyrazoles and their crystal structures, herein we report on the synthesis and crystal structure of the title compound.