title: A highly selective colorimetric chemosensor for cobalt(II) ions based on a tripodal amide ligand.
abstract: A tripodal amide based ligand, tris-{(2-carbamoyl-5-carbomethoxy-pyridine)-2-ethyl}amine (H3L, 1), was synthesized and structurally characterized by single crystal X-ray diffraction. Investigation of the cation recognition behavior showed that the ligand has selective colorimetric sensing properties for cobalt(II) ions by an obvious color change from colorless to yellow. To investigate the sensing mechanism of H3L for Co(2+) ions, UV-vis absorption spectroscopy and single-crystal structural analysis were performed. The mixture of the ligand and cobalt(II) ions displayed selective colorimetric sensing properties for weak acid anions, such as CO3(2-), Ac(-), HCO3(-), SO3(2-), and PO4(3-). Detailed (1)H NMR experiments revealed that the basicity of the anions played an important role in the intensity of the interaction between the ligand and anions. The structures of compounds CoL (2), Co-Ac-HL (3), H4L-NO3 (4), and H4L-ClO4 (5) were also determined by single crystal diffraction studies.
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China. xjkong@xmu.edu.cn ypren@xmu.edu.cn.
authors.forename: Jing-Ru
authors.initials: JR
authors.lastname: Zhou
authors.forename: Da-Peng
authors.initials: DP
authors.lastname: Liu
authors.forename: Yue
authors.initials: Y
authors.lastname: He
authors.forename: Xiang-Jian
authors.initials: XJ
authors.lastname: Kong
authors.forename: Zhi-Ming
authors.initials: ZM
authors.lastname: Zhang
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Ren
authors.forename: La-Sheng
authors.initials: LS
authors.lastname: Long
authors.forename: Rong-Bin
authors.initials: RB
authors.lastname: Huang
authors.forename: Lan-Sun
authors.initials: LS
authors.lastname: Zheng
mesh_terms: D000143:Acids; D000577:Amides / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D003124:Colorimetry / Q000295:instrumentation* / Q000379:methods*; D018360:Crystallography, X-Ray; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000143:Acids; D000577:Amides; D008024:Ligands; D003035:Cobalt