title: A Functional Zn(II) Metallacycle Formed from an N-Heterocyclic Carbene Precursor: A Molecular Sensor for Selective Recognition of Fe3+and IO4-Ions.
abstract: We have reported the synthesis and structural characterization of a unique Zn(II) metallacycle (1) and its utilization as a fluorescent probe for the shape-specific selective recognition (turn-off) of Fe3+and IO4-ions. The relevant Stern-Volmer graphs indicate that the recognitions of Fe3+and IO4-ions are examples of diphasic and monophasic quenchings, respectively. The title metallacycle has been prepared by the reaction of a novel N-heterocyclic carbene precursor, 1,3-bis(2,6-diisopropyl-4-(pyridin-4-yl)phenyl)-1H-imidazol-3-ium chloride/bromide (L), and zinc(II) chloride salt. Notably, the ligand itself did not show any type of recognition for any ions. DFT calculations were performed on L and metallacycle 1 using the geometric parameters, obtained from their single-crystal X-ray diffraction data, to understand the electronic structures of the ligand and macrocycle. The detection limit for the recognition of the Fe3+ion was determined to be 2.5 × 10-6mol/L, and that for IO4-ion was found to be 6.3 × 10-5mol/L.
authors.affiliation: Department of Chemistry & Centre for Advanced Studies in Chemistry, Panjab University , Chandigarh 160014, India.
authors.forename: Girijesh
authors.initials: G
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Kakatiya University , Warangal 506009, India.
authors.forename: Ramu
authors.initials: R
authors.lastname: Guda
authors.affiliation: Department of Chemistry, DAV University , Jalandhar, Punjab 144012, India.
authors.forename: Ahmad
authors.identifier: http://orcid.org/0000-0002-3621-3433
authors.initials: A
authors.lastname: Husain
authors.affiliation: School of Chemistry, University of Hyderabad , Central University P.O., Hyderabad 500046, India.
authors.forename: Ramakrishna
authors.initials: R
authors.lastname: Bodapati
authors.affiliation: School of Chemistry, University of Hyderabad , Central University P.O., Hyderabad 500046, India.
authors.forename: Samar K
authors.identifier: http://orcid.org/0000-0002-9536-6579
authors.initials: SK
authors.lastname: Das