A novel dendritic europium complex containing grafted carbazole units as functional peripheries was synthesized and characterized. The Foerster energy transfer from the peripheries of carbazole units to β-diketonate as well as from the hgands to the central Eu（Ⅲ） ions in the complex was demonstrated. Under the excitation of carbazole units and β-diketonate, characteristic red emission peaks at 612 nm with four shoulders due to the Eu（Ⅲ） ion transition of 5^D0→7^FJ （J=0-4） were observed for the complex.
A dinuclear Eu(Ⅲ) complex Eu2(DBM)6TPPD (Hexa(dibenzoyl-methanido)-(N, N, N, N-tetra(2-pyridyl)-1, 4-phenylenediamine)-dieuropium(Ⅲ)) was synthesized by employing DBM (dibenzoylmethane) and TPPD (N, N, N, N-Tetra(2-pyridyl)-1, 4-phenyl-enediamine) as sensitizing ligands for the Eu(Ⅲ) ion and a bridging ligand, respectively. The analysis of the absorption, excitation, and emission spectra of the dinuclear complex along with a comparison with analogous mononuclear complex containing the same β-diketone ligands and 1, 10-phenanthroline (phen) suggests that the dinuclear complex follows the luminescence mechanism of general Ln(Ⅲ) complexes.
A novel heterometallic complex [Na2Cu2Gd2（pdc）4（H2O）14·2H2O] （H3pdc = 1H- pyrazole-3,5-dicarboxylic acid） has been synthesized and characterized by 1R spectra, elemental analysis, and single-crystal X-ray analysis. The crystal belongs to the monoclinic system, space group P2 1/c with a = 7.9521（18）, b = 12.251（3）, c = 22.293（5） A, β = 110.173（5）°, V= 2038.5（8） A^3, Mr = 1388.13, Z = 2, F（000） = 1352, Dc = 2.261 g/cm^3,/2 = 4.380 mm^-1, the final R = 0.0409 and wR = 0.0622 for 2453 observed reflections with I 〉 2σ（I）. The structural analysis shows that the Na^I, Cu^II and Gd^II ions are linked together by two kinds of bridging ligands （pdc^3- and H2O） to form a main moiety [Na2Cu2Gd2（pdc）4（H2O）14], which can be regarded as a centrosymmetric dimmer of [NaCuGd（pdc）2（H2O）7]. Many hydrogen bonds exist in the complex to build a 3D supramolecular framework.
Two novel interpenetrated coordination polymers,[Zn(IBA)2]n (1) and {[Cd(IBA)2(H2O)].4H2O}n (2),have been synthesized by using 4-imidazole-benzoic acid (HIBA) as ligand under hydrothermal con-ditions. Complex 1 crystallizes in a chiral space group and has a two-fold interpenetrated 2D network structure with (4,4) topology,while complex 2 is a 3D porous dia network with four nets interpene-trating each other. The SHG activity of 1 and the photoluminescent property of 2 have been investi-gated.
BAI ZhengShuai,CHEN ShuiSheng,ZHANG ZhengHua,CHEN ManSheng,LIU GuangXiang & SUN WeiYin State Key Laboratory of Coordination Chemistry,Institute of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210093,China
Unprecedented synthesis of chiral (aza)crown ethers of calix[4]arene derivatives bearing a carboxyl amide bridge was described. The synthesis proceeds through condensation of the corresponding dinitriles with optically active 1,2-aminoalcohols, and is catalyzed by the ZnCl2 Lewis acid at elevated temperature in a very efficient one-pot process. The cavity of calix[4](aza)crowns can encapsulate methanol molecules by O-H⋯п interaction, which has been confirmed by X-ray crystal structures and ESI-MS.
ZhengYi Li MingYu Teng JieJie Ma Ji Huang LeYong WangYi Pan
Three complexes obtained by the reaction of Pr（Ⅲ） or Nd（Ⅲ） salts with 5-methyl-2-pyrazinecarboxylic acid（Hmpca） are structurally determined by single-crystal X-ray diffraction.Complex [Pr（mpca-）3（H2O）2]2·6H2O（1） is composed of dinuclear Pr（Ⅲ） units with two metal centers bridged by two anionic mpca-ligands in a κ^3O,O＇：O＇ bridging mode.Complexes [Pr（mpca-）3]n（2） and [Nd（mpca-）3]n（3） are isostructures,and they consist of polymeric chains based on Ln（Ⅲ） and mpca-ligands.Each pair of adjacent metal centers is linked by three mpca-molecules in a κ^3N,O：O bridging mode.
