Solvent-driven spectroscopic and quantum chemical evaluation of 2-[(trimethylsilyl) ethynyl]thiophene with molecular
Vaithilingam Sasikala1,2, Saminathan Kayarohanam3, Vadivelu Balachandran4
1Department of Physics, Shrimati Indira Gandhi College (Affiliated to Bharathidasan University), Tiruchirappalli, 620 002, India.
Abstract:
Thiophene derivatives are recognised for their notable biological and pharmacological properties. This study examines the electronic structure and antibacterial properties of 2-[(Trimethylsilyl)ethynyl]thiophene (2TSET), emphasising the effects of solvent environments. We utilised spectroscopic techniques such as Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis), and Raman spectroscopy (FT-Raman) to verify the molecular geometry of 2TSET. The vibrational behaviour was analysed using generalised quantum mechanical force field methods. The electronic properties, including frontier molecular orbitals (HOMO-LUMO), were analysed in gas and different solvent phases to assess intramolecular charge transfer. The electronic structure was examined through projected density of states (PDOS) and crystal orbital overlap population (COOP) analyses to evaluate orbital contributions and bonding interactions. Molecular electrostatic potential (MEP), electron localisation function (ELF), and localised orbital locator (LOL) maps were employed to identify chemically reactive sites across various phase conditions. The compound's drug-likeness was assessed through ADMET profiling and bioactivity scoring. Molecular docking studies demonstrated favourable binding interactions, with the highest binding energy underscoring the potential of 2TSET as an antibacterial agent. Among the tested compound (2TSET) exhibited the highest binding affinity toward 2J6M and 3ERT, with a docking score of -4.9 kcal/mol and - 4.6 kcal/mol, indicating strong potential for inhibitory activity.
Related Concept Videos
Structure and Nomenclature of Thiols and Sulfides
Chemical Shift: Internal References and Solvent Effects
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
Preparation and Reactions of Sulfides
π Molecular Orbitals of 1,3-Butadiene
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
UV–Vis Spectroscopy: Woodward–Fieser Rules
Preparation and Reactions of Thiols


