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A series of enantioenriched six-membered metallocyclic amidomagnesium naphtholates were prepared and used to probe the structure–reactivity/selectivity relationships of heteroleptic magnesium base complexes within asymmetric deprotonation reactions. An effective complex was identified and applied within enantioselective enolisation processes, delivering good levels of enantioselectivity and also revealing key structural requirements for achieving such selectivity. 相似文献
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A series of heteroleptic green iridium dendrimers functionalized with carbazole dendrons, such as G2(pic) and G2(acac), have been synthesized, in which picolinic acid and acetylacetone are used as the ancillary ligands, respectively. Compared with the corresponding homoleptic iridium dendrimer G2 (8%), these heteroleptic ones can be prepared under mild conditions with total yields as high as 55-67%. Both the dendrimer G2(pic) and G2(acac) display bright green emissions with photoluminescence quantum yields higher than 0.80 in toluene solution. As a result, a maximum external quantum efficiency of 7.1% (21.0 cd/A) for G2(pic) and 7.7% (25.8 cd/A) for G2(acac) has been realized based on non-doped device configuration. The state-of-art performance indicates that the heteroleptic dendrimers can be promising candidates used for non-doped electrophosphorescent devices, especially when the ease of synthesis in a large scale is considered. 相似文献
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Daniel J. Williams Daniel Gulla Kimberly A. Arrowood Lindsey M. Bloodworth Angela L. Carmack Taylor J. Evers Mark S. Wilson Javier J. Concepcion Carol A. S. Brevett Benjamin E. Huck Donald VanDerveer 《Journal of chemical crystallography》2009,39(8):581-584
Abstract A new compound, [Cd(mipit)4][PF6]2 has been synthesized and characterized via standard solid and solution state methods including single crystal X-ray crystallography
(mipit = 1-methyl-3-(2-propyl)-2(3H)-imidazolethione). The title compound crystallizes in tetragonal space group I4
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/a with a = 12.478(2) ?, b = 12.478(2) ?, c = 28.806(6) ?, and Z = 4. The complex is a high melting, colorless solid that has a distorted tetrahedral CdS4 coordination geometry. Thermogravimetric analysis results for the title compound as well as for another potential CdS synthon
and two potential CdSe synthons are reported.
Graphical Abstract The synthesis and characterization of the title compound, a new ionic homoleptic cadmium complex, tetrakis[1-methyl-3-(2-propyl)-2(3H)-imidazolethione]cadmium(II)
hexafluorophosphate is reported. The results of a single crystal X-ray diffraction analysis reveal a distorted tetrahedral
CdS4 coordination sphere about the cadmium.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
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《Journal of Coordination Chemistry》2012,65(14):2535-2548
Starting from cis-[Ru(dcbpyH2)2Cl2] (1), two new heteroleptic ruthenium(II) complexes, [Ru(dcbpyH2)2(L1)](NO3)2 (L1?=?2-(2′-pyridyl)quinoxaline (2), and [Ru(dcbpyH2)2(L2)](NO3)2 (L2?=?4-carboxy-2-(2′-pyridyl)quinoline (4); dcbpyH2?=?2,2′-bipyridine-4,4′-dicarboxylic acid), were synthesized and spectroscopically characterized. During the preparation of 2 and 4, the homoleptic [Ru(dcbpyH2)3]Cl2 complex (3) was isolated as a side product. Characterization includes IR and Raman spectroscopy, UV-Vis, multinuclear NMR spectroscopy, elemental, and ESI-mass spectrometric analyses. 相似文献
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《Journal of Coordination Chemistry》2012,65(3):453-462
The new heteroleptic iridium(III) complexes (BuOXD)2Ir(tta) and (BuOXD)2Ir(tmd) [BuOXD?=?2-(4-butyloxyphenyl)-5-phenyl[1,3,4]oxadiazolato-N4,C2, tta?=?1,1,1-trifluoro-4-thienylbutane-2,4-dionato, tmd?=?2,2,6,6-tetramethylheptane-3,5-dionato] have been synthesized and characterized. These complexes have two cyclometalated ligands (C^N) and a bidentate diketone ligand (X) [C^N)2Ir(X)], where X is a β-diketone with trifluoromethyl, theonyl or t-butyl groups. The color tuning with the change in electronegativity of substituents in the β-diketones has been studied. Photoluminescence spectra of the complexes showed peak emissions at 523 and 549?nm, respectively. The electroluminescent properties of these complexes have been studied by fabricating multi layer devices with device structure ITO/α-NPD/8% iridium complex doped CBP/BCP/Alq3/LiF/Al. The electroluminescence spectra also showed peak emissions at 526 and 570?nm for (BuOXD)2Ir(tta) and (BuOXD)2Ir(tmd), respectively. These metal complexes showed good thermal stability in air to 340°C. 相似文献
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Aida Raauf Johannes Schläfer Isabel Gessner Andreas Lichtenberg Markus Zegke Thomas Fischer Sanjay Mathur 《印度化学会志》2022,99(3):100347
Bimetallic iron-lanthanide alkoxides were synthesized by reacting [Ln{N(SiMe3)2}3] (Ln ?= ?Pr, Nd, Er) with [Fe2(OtBu)6] in excess tert-butyl alcohol that triggered in-situ ligand exchange and Lewis acid-base interactions to form heterometallic compounds. Single crystal X-ray diffraction analyses of new compounds demonstrated that both Nd and Er containing compounds resulted in the formation of a hetero-bimetallic framework based on 1:1 Ln:Fe ratio, whereas higher Fe ratio (1:2) was observed when Pr was used as the rare earth metal, possibly due to its larger ionic radius (Pr(III): 0.99 ?Å). When the reaction was performed in the presence of chelating ligands (L: H-tfb-mea ?= ?N-(4,4,4-trifluorobut-1-en-3-on)-methoxyethyleneamine; H2-tfb-en ?= ?N–N′-bis-(4,4,4-trifluorobut-1-en-3-on)-ethylenediamine), heteroleptic Ln-Fe derivatives were formed that were used in a representative case ([NdFe(L)(OtBu)m(HOtBu)]) as efficient precursor to synthesize nanocrystalline NdFeO3 ceramic. 相似文献
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Bis(triphenylphosphine)iminium Bis(methoxo)phthalocyaninato(2–)ferrate(III) – Synthesis and Crystal Structure Chlorophthalocyaninato(2–)ferrate(III) reacts with bis(triphenylphosphine)iminium hydroxide in methanol/acetone solution to yield blue crystals of bis(triphenylphosphine)iminium bis(methoxo)phthalocyaninato(2–)ferrate(III). The complex salt crystallizes as an acetone/methanol solvate (bPNP)[Fe(OCH3)2pc2–] · (CH3)2CO · 1.5 CH3OH in the triclinic space group P 1 (no. 2) with the cell parameters a = 13.160(5) Å, b = 15.480(5) Å, c = 17.140(5) Å, α = 97.54(5)°, β = 91.79(5)°, γ = 95.44(5)°. The Fe atom is located in the centre of the pc2– ligand coordinating four isoindole N atoms (Niso) of the pc2– ligand and two O atoms of the methoxo ligands in a mutual trans arrangement. The average Fe–O and Fe–Niso distances are 1.887 and 1.943 Å, respectively. The cation adopts the bent conformation (< P–N–P = 140.4(2)°) with P–N distances of 1.579(3) and 1.575(3) Å. 相似文献
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Yan Liu Shou-Heng Liao Wen-Tao Dai Qixia Bai Dr. Shuai Lu Prof. Dr. Heng Wang Prof. Dr. Xiaopeng Li Prof. Dr. Zhe Zhang Prof. Dr. Pingshan Wang Prof. Dr. Wei Lu Prof. Dr. Qi Zhang 《Angewandte Chemie (International ed. in English)》2023,62(6):e202217215
Construction of supramolecular structures with internal functionalities is a promising approach to build enzyme-like cavities. The endo-functionalized [Pd12L24] and [Pd2L4] coordination cages represent the most successful systems in this regard. However, these systems mainly contain one type of endo-moiety. We herein provide a solution for the controlled endo-functionalization of [Pd2L4] cages. Site-selective introduction of the endo-functional group was achieved through the formation of heteroleptic [Pd2( LA )2( LB )( LC )] cages. Using two orthogonal steric control elements is the key for the selective formation of the hetero-assemblies. We demonstrated the construction of two hetero-cages with a single internal functional group as well as a hetero-cage with two distinct endohedral functionalities. The endo-functionalized hetero-cages bound sulfonate guests with fast-exchange dynamics. This strategy provides a new solution for the controlled endo-functionalization of supramolecular cavities. 相似文献
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Two ruthenium(II) dithiocarbamates, cis-[Ru(DMP)2L](BF4), where L = 4-(4-methoxy-phenyl)piperazine-1-carbodithioate (1) and 4-(3-methoxyphenyl)piperazine-1-carbodithioate (2) and DMP = 2,9-dimethyl-1,10-phenanthroline, have been synthesized and characterized. The DNA-binding affinity of these metal complexes was investigated by UV–visible spectrophotometry with DNA-binding constants of 6.2 × 104 M?1 (1) and 1.2 × 105 M?1 (2) and electrostatic binding mode was confirmed by viscometric measurements. For insight into the structural differences, both complexes were studied computationally. B3LYP/LANL2DZ level of Density Functional Theory was used for the computational studies in Gaussian 09. The optimized bond lengths are in agreement with the reported values. Comparative computational studies reveal interesting transformations in bond lengths, angles, Natural Bond Orbital charges, molecular orbitals, Molecular Electro Static Potentials, and global chemical reactivity indices. Based on quantum chemical results a structure–activity relationship has been attempted. 相似文献