title: New fluorenyl-substituted ditopic dioxotetraamine ligands and their copper(II) complexes--synthesis, crystal structure, magnetic properties and solution behavior.
abstract: A new fluorenyl-substituted dioxotetraamine salicylaldehyde Schiff-base ligand (L1) has been synthesized by the non-template 1 + 2 condensation of ligand 6-(9-fluorenyl)-1,4,8,11-tetraazaundecane-5,7-dione (L) with salicylaldehyde. From reduction of L1 with an excess of NaBH4, a ditopic dioxotetraamine ligand (L2) has been obtained. The copper(II) complex of L1 has been synthesized and its properties were examined by ES-MS and variable-temperature magnetic susceptibility as well as its crystal structure being determined. Detailed studies have been made on solution chemistry of Cu(II) complex of L2 by pH-potentiometric and fluorometric titration.
authors.affiliation: Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, China.
authors.forename: Qing-Xiang
authors.initials: QX
authors.lastname: Li
authors.forename: Yi-Ning
authors.initials: YN
authors.lastname: Wang
authors.forename: Qin-Hui
authors.initials: QH
authors.lastname: Luo
authors.forename: Xue-Lei
authors.initials: XL
authors.lastname: Hu
authors.forename: Yi-Zhi
authors.initials: YZ
authors.lastname: Li
mesh_terms: D000588:Amines / Q000138:chemical synthesis* / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005449:Fluorenes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D008280:Magnetics; D008958:Models, Molecular; D015394:Molecular Structure; D010100:Oxygen / Q000737:chemistry*; D012996:Solutions; D013050:Spectrometry, Fluorescence; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D017186:Titrimetry
chemical_list: D000588:Amines; D005449:Fluorenes; D008024:Ligands; D012996:Solutions; D003300:Copper; D010100:Oxygen