title: Two novel six-coordinated cadmium(II) and zinc(II) complexes from carbazate β-diketonate: crystal structures, enhanced two-photon absorption and biological imaging application.
abstract: To explore the photophysical properties of coordination compounds with enhanced two-photon absorption, two novel six-coordinated metal complexes (ML2, M = Cd(ii), Zn(ii)) from carbazole β-diketone ligand (HL = 4,4,4-trifluoro-1-(9-butylcarbazole-3-yl)-1,3-butanedione) were prepared and fully characterized. Their crystal structures were determined by X-ray diffraction analysis. Both variable temperature (1)H NMR spectra and MALDI-TOF mass spectrometry proved that the coordination compounds exhibit good stability in solution. The results of time-dependent density functional theory (TD-DFT) calculations indicated that the complexation of the ligands with metal ion extends the electronic delocalization in the coordination compounds, leading to enhanced two-photon absorption. The photophysical properties for the coordination compounds were identified relying on both experimentally and theoretically studies. Finally, confocal microscopy and two-photon microscopy fluorescent imaging of HepG2 cells labeled with the Zn(ii) complexe revealed its potential applications as a biological fluorescent probe.
authors.affiliation: Department of Chemistry, Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province, Anhui University, Hefei 230039, P. R. China. jywu1957@163.com yptian@ahu.edu.cn.
authors.forename: Cuiyun
authors.initials: C
authors.lastname: Nie
authors.forename: Qiong
authors.initials: Q
authors.lastname: Zhang
authors.forename: Hongjuan
authors.initials: H
authors.lastname: Ding
authors.forename: Bei
authors.initials: B
authors.lastname: Huang
authors.forename: Xinyan
authors.initials: X
authors.lastname: Wang
authors.forename: Xianghua
authors.initials: X
authors.lastname: Zhao
authors.forename: Shengli
authors.initials: S
authors.lastname: Li
authors.forename: Hongping
authors.initials: H
authors.lastname: Zhou
authors.forename: Jieying
authors.initials: J
authors.lastname: Wu
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Tian
mesh_terms: D000042:Absorption; D002104:Cadmium / Q000737:chemistry*; D018360:Crystallography, X-Ray; D056945:Hep G2 Cells; D006801:Humans; D006834:Hydrazines / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D057054:Molecular Imaging / Q000379:methods*; D009942:Organometallic Compounds / Q000737:chemistry*; D017785:Photons; D011789:Quantum Theory; D015032:Zinc / Q000737:chemistry*
chemical_list: D006834:Hydrazines; D009942:Organometallic Compounds; D002104:Cadmium; C010877:carbazic acid; D015032:Zinc