title: Exploratory studies towards various anion recognition chemistry by two different sized cleft shaped organic ligands.
abstract: Indole and urea based two organic receptors have been synthesized by an easy synthetic process. These two receptors have strong sensitivity and selectivity for several bio-relevant anions. Receptor 1 and 2 were synthesized from indole-2-carboxylic acid and p-anisidine respectively, which are low cost starting materials. Receptor 1 can selectively sense anions like F(-), OAc(-) and H2PO4(-), while receptor 2 can only sense F(-) and H2PO4(-). Both receptors are silent toward anions like Cl(-), Br(-), I(-) and NO3(-). It is the difference in their shape and size which are responsible for different anion sensing. The nature of these host-guest type interactions was analyzed by convenient spectrophotometric techniques like UV-Vis, fluorescence, (1)H NMR, FT-IR studies and also confirmed by electrochemical techniques like cyclic voltammetry studies of the two ligand receptors with convenient anions. Between receptor 1 and 2, receptor 2 was crystallographically characterized also.
authors: Surface Engineering & Tribology Group, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, India; Academy of Scientific & Innovative Research, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, India.
authors: Additi
authors: A
authors: RoyChowdhury
authors: Surface Engineering & Tribology Group, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, India.
authors: Pritam
authors: P
authors: Ghosh
authors: Surface Engineering & Tribology Group, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, India; Academy of Scientific & Innovative Research, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, India.
authors: Sourav Kr
authors: SK
authors: Saha
authors: Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
authors: Partha
authors: P
authors: Mitra
authors: Surface Engineering & Tribology Group, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, India; Academy of Scientific & Innovative Research, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, India. Electronic address: pr_banerjee@cmeri.res.in.
authors: Priyabrata
authors: P
authors: Banerjee
mesh_terms: D000838:Anions / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D055664:Electrochemical Techniques; D007700:Kinetics; D008024:Ligands; D009930:Organic Chemicals / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D017186:Titrimetry
chemical_list: D000838:Anions; D008024:Ligands; D009930:Organic Chemicals; D012996:Solutions; D004121:Dimethyl Sulfoxide
keywords: (1)H NMR and UV–Visible spectroscopy; Anion binding; Cyclic voltammetry; Fluorescence; H-bonding; Urea and indole-based receptor