A Functional Zn(II) Metallacycle Formed from an N-Heterocyclic Carbene Precursor: A Molecular Sensor for Selective Recognition of Fe3+ and IO4- Ions

作者：Kumar Girijesh; Guda Ramu; Husain Ahmad; Bodapati Ramakrishna; Das Samar K^*

来源：Inorganic Chemistry, 2017, 56(9): 5017-5025.

DOI：10.1021/acs.inorgchem.7b00098

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 x 10(-6) mol/L, and that for IO4- ion was found to be 6.3 x 10(-5) mol/L.

• 出版日期2017-5-1