排序方式: 共有74条查询结果,搜索用时 31 毫秒
41.
Hwang SH Moorefield CN Wang P Jeong KU Cheng SZ Kotta KK Newkome GR 《Journal of the American Chemical Society》2006,128(23):7505-7509
CdS nanoparticles on the surface of single-walled carbon nanotubes (SWNTs) were templated and stabilized through the initial attachment of 1 --> 3 C-branched amide-based dendrons and were both photophysically and morphologically characterized. The CdS clusters were shown to be ca. 1.4 nm in diameter as calculated from their optical absorption spectra and exhibited reduced fluorescence emission intensity at 434 nm compared to that of CdS quantum dots stabilized by untethered dendrons due to partial emission quenching by the SWNT. Unchanged UV absorption behavior of these materials indicated that they are stable > 90 days at 25 degrees C. 相似文献
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Hwang SH Moorefield CN Wang P Fronczek FR Courtney BH Newkome GR 《Dalton transactions (Cambridge, England : 2003)》2006,(29):3518-3522
Synthesis of a novel bis(terpyridine) ligand, 4,4'-bis(2,2':6',2'-terpyridinyl)triphenylamine, utilizing triphenylamine, as a specific angle controller, has led to the self-assembly of a unique hexagonal metallomacrocycle family, [Fe6(2)6(PF6)12] and [Zn6(2)6(BF4)12], utilizing terpyridine-metal(II)-terpyridine connectivity. The crystal structure of the novel ligand shows that the angle between the two terpyridinyl moieties is 119.69 degrees , which enabled the formation of the hexagonal-shaped macrocycles. The crystal packing architectures of this starting ligand revealed channels induced by solvent encapsulation. Following complexation of this ligand with transition metals [Fe(II) or Zn(II)] in a one-pot reaction, the resultant structures were characterized by (1)H and (13)C NMR, UV/Vis and mass spectroscopies. The expected metal-to-ligand charge transfer (MLCT; lambda(max) = 582 nm) and emission (lambda(em) = 575 nm) characteristics were exhibited by both [Fe6(2)6(PF6)12] and[Zn6(2)6(BF4)12]. The photoelectrochemical characteristics of these hexagonal metallomacrocycles demonstrate that they can be used as sensitizers in dye-sensitized solar cells. 相似文献
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Wang JL Li X Lu X Chan YT Moorefield CN Wesdemiotis C Newkome GR 《Chemistry (Weinheim an der Bergstrasse, Germany)》2011,17(17):4830-4838
The synthesis, purification, structural analysis, and photophysical properties of a series of five-, six-, and seven-sided Fe(II) macrocycles and the corresponding hexameric Cd(II) macrocycle, all prepared by self-assembly of a 120° bis(terpyridine) ligand modified with first- and second-generation 1→3 C-branched dendrons, are reported. All metallomacrocycles were fully characterized by (1)H and (13)C NMR spectroscopy, traveling-wave ion-mobility mass spectrometry (TWIM MS), molecular modeling, UV/Vis absorption spectroscopy, photoluminescence, and cyclic voltammetry. A gradual increase of the collision cross sections of the Fe(II) metallomacrocycles was observed with a successive increase of the number and molecular size of the ligands. The combination of ion-mobility mass spectrometry and NMR techniques unveils structural features that agree well with calculations. Extinction coefficients and emission are significantly modulated by increasing the ring size and changing the metal ion center from Fe(II) to Cd(II) . 相似文献
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Mohammad L. Hassan Shaimaa M. Fadel Charles Moorefield George R. Newkome 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(9):743-749
Cellulose nanocrystals (CNC) isolated from bleached bagasse pulp were modified with a second-generation isocyanate dendron (G2-dendron) to prepare dendronized cellulose nanocrystals (DCN). Transmission electron microscopy (TEM), elemental analysis for nitrogen, Fourier transform infrared (FTIR) and 13C magic angle spinning nuclear magnetic resonance (13C MAS NMR) proved occurrence of the modification of cellulose nanocrystals surfaces. The dendronized cellulose nanocrystals were used as templates for formation of ZnS and CdS quantum dots with uniform diameter at low temperature in water. The prepared DCN/QDs were highly soluble in water. TEM images showed that the size of the prepared quantum dots was about 5 nm in diameter. UV-Visible and fluorescence spectroscopy showed absorption and emission at wavelength values lower than that reported for bulk ZnS and CdS. 相似文献
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Cho TJ Shreiner CD Hwang SH Moorefield CN Courneya B Godínez LA Manríquez J Jeong KU Cheng SZ Newkome GR 《Chemical communications (Cambridge, England)》2007,(43):4456-4458
A novel tetrakis(terpyridinyl)porphyrin derivative and its Ru(II) complexes were efficiently synthesized using microwave enhanced synthesis and shown to possess photovoltaic properties. Transmission electron microscopy and selected area electron diffraction were used to investigate its nanowire self-assembly. 相似文献
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Cover Picture: Precise Molecular Fission and Fusion: Quantitative Self‐Assembly and Chemistry of a Metallo‐Cuboctahedron (Angew. Chem. Int. Ed. 32/2015)
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Dr. Ting‐Zheng Xie Dr. Kai Guo Zaihong Guo Wen‐Yang Gao Dr. Lukasz Wojtas Dr. Guo‐Hong Ning Mingjun Huang Dr. Xiaocun Lu Jing‐Yi Li Dr. Sheng‐Yun Liao Dr. Yu‐Sheng Chen Dr. Charles N. Moorefield Dr. Mary Jane Saunders Prof. Stephen Z. D. Cheng Prof. Chrys Wesdemiotis Prof. George R. Newkome 《Angewandte Chemie (International ed. in English)》2015,54(32):9129-9129
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Reversible Self‐Assembly of Terpyridine‐Functionalized Graphene Oxide for Energy Conversion
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Shungang Song Dr. Yuhua Xue Prof. Lianfang Feng Hany Elbatal Dr. Pingshan Wang Dr. Charles N. Moorefield Prof. George R. Newkome Prof. Liming Dai 《Angewandte Chemie (International ed. in English)》2014,53(5):1415-1419
Terpyridine‐functionalized graphene oxides were prepared for self‐assembly into 3D architectures with various metal ions (e.g., Fe, Ru). The resulting electrode materials showed significantly improved electroactivities for efficient energy conversion and storage. They showed promise for application in the oxygen reduction reaction (ORR), photocurrent generation, and supercapacitance. 相似文献
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Newkome GR Yoo KS Kim HJ Moorefield CN 《Chemistry (Weinheim an der Bergstrasse, Germany)》2003,9(14):3367-3374
Routes for the syntheses of isomeric, zwitterionic, bisterpyridine-Ru(II)-based macromolecules are described. Access to these novel architectures is facilitated by the construction of terpyridine-modified, 1-->3 C-branched, ester-terminated building blocks. Constitutional isomers result from the interchangable placement of methyl and tert-butyl ester groups on both the branched framework near the Ru(II) centers and the termini of the branched construct. Water solubility is imparted to each isomer through selective transformation of the tert-butyl esters to their corresponding carboxylates. Along with the standard characterization techniques, electrochemical and spectroscopic data also support the structural formation. 相似文献
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