title: Syntheses, structures and photophysical properties of heterotrinuclear Zn2Ln clusters (Ln = Nd, Eu, Tb, Er, Yb).
abstract: Heterotrinuclear Zn(2)Ln (Ln = Nd 2, Eu 3, Tb 4, Er 5, Yb 6) clusters [(Znq(2))(2)](mu-CH(3)COO){Ln(hfac)(2)} (q = 8-hydroxylquinolinate, hfac = hexafluoroacetylacetonate) have been synthesized. The Zn(2)Ln framework is ligated by two q ligands featuring mu-phenoxo and two q ligands featuring mu(3)-phenoxo coordination modes, and one mu-CH(3)COO(-) anions. Since the short intramolecular separations of Zn...Ln (ca. 3.354-3.373 A) allow energy transfer from Znq(2)-based sensitizers to the Ln(III) centres through two energy transfer pathways, the lanthanide luminescence is indeed "lighted up" by excitation of the Znq(2)-based chromopores. Photophysical measurements revealed that these Zn(2)Ln complexes exhibit the so-called "dual emission" originating from both Znq(2)-based luminophores and lanthanide emitters. By virtue of the dual luminescence with complementary colours, the Znq(2)-based cyan emission and Eu(III)-centred red luminescence are combined to generate a white-light emission in the Zn(2)Eu (3) complex.
authors.affiliation: MOE Laboratory of Bioinorganic and Synthetic Chemistry/State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, China. haibingxu@fjirsm.ac.cn
authors.forename: Hai-Bing
authors.initials: HB
authors.lastname: Xu
authors.forename: Ye-Teng
authors.initials: YT
authors.lastname: Zhong
authors.forename: Wei-Xiong
authors.initials: WX
authors.lastname: Zhang
authors.forename: Zhong-Ning
authors.initials: ZN
authors.lastname: Chen
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Chen
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D004871:Erbium / Q000737:chemistry; D005063:Europium / Q000737:chemistry; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008968:Molecular Conformation; D009354:Neodymium / Q000737:chemistry; D010422:Pentanones / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013725:Terbium / Q000737:chemistry; D015018:Ytterbium / Q000737:chemistry; D015032:Zinc / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D006845:Hydrocarbons, Fluorinated; D028581:Lanthanoid Series Elements; D010422:Pentanones; C518705:hexafluoroacetylacetonate; D013725:Terbium; D009354:Neodymium; D005063:Europium; D004871:Erbium; D015032:Zinc; D015018:Ytterbium