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1.
《Journal of Coordination Chemistry》2012,65(24):3981-3992
Two new terbium complexes with aromatic carboxylic acids, [(Tb)2(L1)6(H2O)4] (1) and [(Tb)2(L2)6(H2O)2(DMF)2] (2) (HL1: nicotinic acid; HL2: 4-hydroxybenzoic acid), with different coordination geometries have been synthesized and their crystal structures determined. The luminescence properties of the two complexes, including the phosphorescence lifetime, have been investigated. The effect of a secondary ligand on luminescence of the ternary terbium complex with carboxylic acid and the relationship between luminescence properties and crystal structure, including coordination mode of the carboxyl groups from HL1 and HL2 and coordination mode of a secondary ligand, are discussed. 相似文献
2.
Two new zinc(II) complexes have been synthesized and studied by single crystal X-ray diffraction method: [Zn(L1)Cl2]·2DMF (1) and [Zn(L2)Cl2]·DMF (2) (L1 = 3,3′-bis(2-benzimidazolyl)-2,2′-dipyridine, L2 = 3,3′-bis[2-bis(2-ethylbenzimidazolyl)]-2,2′-dipyridine). Compound
1 is monoclinic, C2/c, a = 23.142(3) ?, b = 11.845(1) ?, c = 14.735(3) ?; compound 2 is orthorhombic, C2221, a = 12.140(7) ?, b = 16.283(9) ?, c = 16.51(1) ?. In both compounds, Zn(II) cations are coordinated by two chlorine atoms and two benzimidazole nitrogen atoms
in a slightly distorted tetrahedron fashion. Structural features responsible for fluorescent properties of the complexes are
discussed. 相似文献
3.
W. G. Xi M. D. Yang L. P. Wang H. J. Li J. H. Yu H. P. Zhou Z. C. Wu 《Russian Journal of Coordination Chemistry》2014,40(10):704-710
Three new complexes, [CdL2(CH3COO)2(H2O)2] (I), CdL2Br2 (II), CdL2I2 (III), have been successfully synthesized by self-assembly of corresponding metal salts with (E)-2-(3-(4-(1H-imidazole-1-yl)styryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile (L). The structures of the complexes were determined by single crystal X-ray diffraction analysis (CIF file CCDC nos. 957831 (I), 957792 (II), 957832 (III)). In complex I, central metal is six-coordinated and the crystal packing shows a 3D supramolecular framework. Complexes II and III display the similar 2D supramolecular structures in which the central metals are four-coordination. The luminescent properties were investigated. 相似文献
4.
Two new cadmium(II) complexes, Cd2(L1)2(NCS)2 (1) and Cd2(L2)2(NCS)2 (2), where L1 and L2 are the deprotonated forms of 2-[(3-dimethylaminopropylimino)methyl]-6-ethoxyphenol and 2-methoxy-6-[(pyridin-2-ylmethylimino)methyl]phenol,
respectively, have been isolated as crystalline products and characterized by elemental analysis, IR spectroscopy, and single
crystal X-ray diffraction method. Both compounds are structurally similar and are phenolate-O-bridged dinuclear cadmium(II)
complexes. Each Cd(II) cation in the complexes is octahedrally coordinated. The Cd Cd distances in (1) and (2) are 3.618(2) d 3.571(2) 相似文献
5.
Liang Oyang Hao-Ling Sun Xin-Yi Wang Jun-Ran Li Dao-Bo Nie Wen-Fu Fu Song Gao Kai-Bei Yu 《Journal of Molecular Structure》2005,740(1-3):175-180
Ternary terbium complexes with p-aminobenzoic acid (HL), [TbL3(DMSO)(H2O)]2 (1), [TbL3(DMF)(H2O)]2 (2) and [TbL3(Bpy)(H2O)]2·2H2O (3) (DMSO=dimethyl sulfoxide, DMF=N, N- dimethylformamide, Bpy=2, 2′- bipyridyl) have been synthesized, and their crystal structures determined. The luminescence properties of these complexes, including both the emission quantum yield and the fluorescence lifetime, have been investigated. The effect of a second ligand on the crystal structure and luminescence property of the ternary terbium p-aminobenzoic acid complexes, and the relationship between luminescence properties and crystal structure, including coordination mode of the L− ligand and the characteristics of a second ligand, are discussed. 相似文献
6.
B. V. Bukvetskii N. V. Petrochenkova A. G. Mirochnik 《Journal of Structural Chemistry》2009,50(3):485-489
The atomic structure of europium acrylate crystals [Eu2(Acr)5OH·3H2O]·2(0.5H2O) was studied by X-ray analysis (a = 24.360(3) Å, b = 18.466(2) Å, c = 8.5818(9) Å, β = 96.087(2)°, space group C2/c, Z = 6, ρcalc = 2.036 g/cm3). The crystal structure involves chains of binuclear [Eu2(C3H3O2)5OH·3H2O] molecules, running infinitely in the [101] direction and having pairs of C9H9EuO7H2O molecules alternating with C6H6EuO4OH·2H2O molecules that link the pairs. The infinite chains are linked by hydrogen bonds and van der Waals interactions. The thermal behavior of luminescence of the europium(III) complex is discussed. 相似文献
7.
Kun Tang JianJun Zhang Ning Ren JunRu Zheng JingYu Liu KeZhong Wu 《中国科学:化学(英文版)》2012,55(7):1283-1293
A series of lanthanide complexes with the 3,4,5-trimethoxybenzoic acid(3,4,5-tmoba) and 1,10-phenanthroline(phen),[Ln(3,4,5-tmoba) 3 phen] 2(Ln = Pr(1),Nd(2) and Ho(3)),have been synthesized and characterized by a series of techniques including elemental analysis,IR spectra,X-ray crystallography and TG/DSC-FTIR technology.The three complexes have two kinds of coordination modes,in which the Pr 3+ and Nd 3+ cations are nine-coordinated and the Ho 3+ cation is eight-coordinated.The three-dimensional IR accumulation spectra of gaseous products for complexes 1-3 were analyzed and the gaseous products were identified by the typical IR spectra obtained from the 3D surface graphs.Meanwhile,we obtained the activation energy E of the first steps of complexes 1-3 by the integral isoconversional non-linear(NL-INT) method and discussed the non-isothermal kinetics of complexes 1-3 using the Malek method.Finally,SB(m,n) was defined as the kinetic method of the first-step thermal decomposition.The thermodynamic parameters △G≠,△H≠ and △S≠ of activation at the peak temperature were also calculated. 相似文献
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9.
Fabelo O Pasán J Cañadillas-Delgado L Delgado FS Lloret F Julve M Ruiz-Pérez C 《Inorganic chemistry》2008,47(18):8053-8061
The hydrothermal preparation, crystal structure determination, and magnetic study of two isomers made up of 1,2,4,5-benzenetetracarboxylate and high-spin Co(II) ions of formula [Co2(bta)(H2O)4]n x 2n H2O (1 and 2; H4bta = 1,2,4,5-benzenetetracarboxylic acid) are reported. 1 and 2 are three-dimensional compounds whose structures can be described as (4,4) rectangular layers of trans-diaquacobalt(II) units with the bta(4-) anion acting as tetrakis-monodentate ligand through the four carboxylate groups, which are further connected through other trans-[Co(H2O)2](2+) (1) and planar [Co(H2O)4](2+) (2) entities, with the bridging units being a carboxylate group in either the anti-syn (1) or syn-syn (2) conformations and a water molecule (2). The study of the magnetic properties of 1 and 2 in the temperature range 1.9-300 K shows the occurrence of weak antiferromagnetic interactions between the high-spin Co(II) ions, with the strong decrease of chi(M)T upon cooling being mainly due to the depopulation of the higher energy Kramers doublets of the six-coordinated Co(II) ions. The computed values of the exchange coupling between the Co(II) ions across anti-syn carboxylate (1) and syn-syn carboxylate/water (2) bridges are J = -0.060 (1) and -1.90 (2) cm(-1) (with the Hamiltonian being defined as H = -Jsigma(i,j)S(i) x S(j)). These values follow the different conformations of the carboxylate bridge in 1 (anti-syn) and 2 (syn-syn) with the occurrence of a double bridge in 2 (water/carboxylate). 相似文献
10.
《Journal of Coordination Chemistry》2012,65(16):1873-1882
Two lanthanide complexes with 2-fluorobenzoate (2-FBA) and 1,10-phenanthroline (phen) were synthesized and characterized by X-ray diffraction. The structure of each complex contains two non-equivalent binuclear molecules, [Ln(2-FBA)3?·?phen?·?CH3CH2OH]2 and [Ln(2-FBA)3?·?phen]2 (Ln?=?Eu (1) and Sm (2)). In [Ln(2-FBA)3?·?phen?·?CH3CH2OH]2, the Ln3+ is surrounded by eight atoms, five O atoms from five 2-FBA groups, one O atom from ethanol and two N atoms from phen ligand; 2-FBA groups coordinate Ln3+ with monodentate and bridging coordination modes. The polyhedron around Ln3+ is a distorted square-antiprism. In [Ln(2-FBA)3?·?phen]2, the Ln3+ is coordinated by nine atoms, seven O atoms from five 2-FBA groups and two N atoms of phen ligand; 2-FBA groups coordinate Ln3+ ion with chelating, bridging and chelating-bridging three coordination modes. The polyhedron around Ln3+ ion is a distorted, monocapped square-antiprism. The europium complex exhibits strong red fluorescence from 5D0?→?7F j ( j?=?1–4) transition emission of Eu3+. 相似文献
11.
《Arabian Journal of Chemistry》2022,15(9):104089
Five lanthanide complexes with polydentate coordination were successfully synthesized by volatilization of 2,4-difluorobenzoate and o-phenanthroline ligands. The structure general formula is [Ln(2,4-DFBA)3(phen)]2, (Ln = La(1), Gd(2), Tb(3), Dy(4), Ho(5); 2,4-DFBA = 2,4-difluorobenzoate, phen = o-phenanthroline). The crystal structures of five complexes were determined, and supramolecular structures were probed. Characterization was performed by elemental analysis, IR, Raman spectroscopy and XRD, followed by an examination of the fluorescence and heat capacity properties. The molar heat capacities of complexes 4 and 5 were determined in detail by the DSC apparatus, and the thermodynamic functions were calculated. Finally, the fluorescence properties of complexes 3 and 4 were investigated. Using DFT, the HOMO, LUMO energy levels of the ligands and their single and triplet state energy levels were calculated at the level of the valence layer cleavage 6-311G(d,p) basis group, and the fluorescence enhancement mechanism was explained from the energy transfer perspective. 相似文献
12.
Yu. G. Ganin V. F. Anikin V. Kh. Kravtsov A. A. Lyutikova S. V. Krutius 《Journal of Structural Chemistry》1989,30(3):525-528
Tiraspol' Branch, All Union Scientific Research Institute for Electrical Insulation Materials. Translated from Zhurnal Strukturnoi Khimii, Vol. 30, No. 3, pp. 184–187, May–June, 1989. 相似文献
13.
Yu. G. Ganin V. F. Anikin V. Kh. Kravtsov M. D. Mazus A. A. Lyutikova 《Journal of Structural Chemistry》1991,32(3):399-401
Tiraspol Branch, All-Union Scientific-Research Institute of Electromechanics, Odessa State University. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 3, pp. 100–102, May–June, 1991. 相似文献
14.
Yu. G. Ganin V. F. Anikin O. N. Rebrova A. A. Lyutikova S. V. Krutius 《Journal of Structural Chemistry》1988,28(4):577-581
Department of All-Union Scientific-Research and Planning-Technological Institute of Electrical Insulation Materials and Foiled Dielectrics. Translated from Zhurnal Strukturnoi Khimii, Vol. 28, No. 4, pp. 137–142, July–August, 1987. 相似文献
15.
Erwann Jeanneau 《Journal of solid state chemistry》2003,173(2):387-394
A new mixed metal oxalate Cd3In2(C2O4)6·9H2O, with an open-framework structure, has been prepared from a precipitation method at room temperature. Its crystal structure has been solved from single-crystal diffraction data. The compound crystallizes with space group P6422 and the cell parameters are a=8.566(5)Å, c=37.811(5) Å, V=2403(2) Å3, and Z=3 (R1=0.036). The three-dimensional structure is built from three types of MO8 (M=Cd, In) polyhedra, i.e., triangular dodecahedra, bicapped trigonal prisms and an undefined distorted eight-fold cadmium polyhedron. Relationships with the structures of the related cadmium zirconium oxalates are discussed. The structure overview suggests the possibility to conceive new oxalate-based materials with open-framework structures. The thermal behavior of the new compound is described in details from temperature-dependent X-ray powder diffraction and thermogravimetry measurements. The dehydration process of the precursor is reversible in its stability temperature range. The final product consists of a mixture of nanocrystalline CdIn2O4 and the simple oxides. 相似文献
16.
The atomic structure of antimony(III) bromide crystals with anilinium was determined by X-ray diffraction analysis of (C6H5NH3)2SbBr5 (a = 19.704(3) Å, b = 7.914(1) Å, c = 25.556(4) Å; space group Pbca, Z = 8, ρcalc = 2.365 g/cm3). The crystal structure consists of infinite chains of [SbBr5]2? complex anions formed by sharing six vertices and the anilinium (C6H5NH3)+ cations, through which the chains are linked in layers by N-H...Br hydrogen bonds. The geometrical aspects that determine the luminescent spectral properties of the complex are discussed. 相似文献
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19.
R. Jlassi W. Rekik H. Naïli T. Mhiri T. Bataille 《Journal of Structural Chemistry》2013,54(6):1122-1132
Two organic-inorganic hybrid compounds (C5H14N2)[Cd(H2O)6](SO4)2 (I) and R-(C5H14N2)×[Cd(H2O)6](SO4)2 (II) are synthesized by the slow evaporation method and characterized by single crystal X-ray diffraction, thermogravimetry, temperature-dependent X-ray diffraction, and infrared spectroscopy. The first compound crystallizes in the centrosymmetric space group P21/n with the following unit cell parameters: a = 6.6208(2) Å, b = 10.6963(3) Å, c = 12.9318(4) Å, V = 893.05(6) Å3, and Z = 2. Its structure is solved by direct methods and refined by the least-squares analysis [R 1 = 0.0389 and wR 2 = 0.0821]. This compound shows a crystallographic disorder II destroys the inversion symmetry and leads to a fully ordered structure. Indeed, compound II crystallizes in the non-centrosymmetric space group P21 with the following unit cell parameters: a = 6.6306(1) Å, b = 10.7059(2) Å, c = 12.9186(1) Å, V = 894.67(2) Å3, and Z = 2. The crystal structure of both compounds is built from isolated SO 4 2? anions, disordered 2-methylpiperazinediium, (C5H14N2)2+ in compound I or R-2-methylpiperazinediium R-(C5H14N2)2+ in compound II, and divalent metal cations surrounded by six water molecules. These different entities are connected together only by a 3D hydrogen bond network. The thermodiffractometry and the thermogravimetric analyses indicate that the decomposition of the supramolecular precursors proceeds through several stages leading to cadmuim oxide. 相似文献