排序方式: 共有34条查询结果,搜索用时 31 毫秒
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Del Castillo TJ Sarkar S Abboud KA Veige AS 《Dalton transactions (Cambridge, England : 2003)》2011,40(32):8140-8144
This report describes the synthesis and characterization of 1,5-bis-triphenylphosphinegold(I) 1,2,3-triazolate (3((1,5))). The synthesis of the dinuclear complex 3((1,5)) is achieved via an unprecedented inorganic click (iClick) reaction between the metal-azide PPh(3)AuN(3) (1) and the metal-acetylide PPh(3)Au-C≡CPh (2). Characterization of 3((1,5)) includes multinuclear NMR spectroscopy, combustion analysis, and single crystal X-ray crystallography. Experimental characterization is complemented with density-functional-theory (DFT) calculations which indicate the 1,4-isomer 3((1,4)) is less stable by 3.3 kcal mol(-1). The energetic difference lies primarily in the ability of the phenyl group in the 4-position of 3((1,5)) to lie coplanar with the triazolate to create a delocalized π-bonding HOMO orbital. 相似文献
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Jhonti Chakraborty Ushnish Mandal Ion Ghiviriga Khalil A. Abboud Prof. Dr. Adam S. Veige 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(62):14059-14063
Reported is the hydrolysis of a homogeneous Mo-nitride complex bearing a trianionic pincer-type ligand to produce ammonia. Treating the anionic [(ONO)]Mo≡N(OtBu)]Ph3PCH3 with two equivalents of water produces ammonia and the dioxo complex [(ONO)]MoO2]Ph3PCH3. X-Ray crystal structures of the starting nitrido complex and product dioxo complex are presented. Evidence for ammonia release comes from GC-MS and deuterium-labelling studies. The reaction is presented in the context of a two-stage solar thermochemical dinitrogen fixation process as the solid-state nitride hydrolysis step. 相似文献
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Soufiane S. Nadif Dr. Matthew E. O'Reilly Dr. Ion Ghiviriga Dr. Khalil A. Abboud Prof. Adam S. Veige 《Angewandte Chemie (International ed. in English)》2015,54(50):15138-15142
A chemically non‐innocent pyrrole‐based trianionic (ONO)3? pincer ligand within [(pyr‐ONO)TiCl(thf)2] ( 2 ) can access the dianionic [(3H‐pyr‐ONO)TiCl2(thf)] ( 1‐THF ) and monoanionic [(3H,4H‐pyr‐ONO)TiCl2(OEt2)][B{3,5‐(CF3)2C6H3}4] ( 3‐Et2O ) states through remote protonation of the pyrrole γ‐C π‐bonds. The homoleptic [(3H‐pyr‐ONO)2Zr] ( 4 ) was synthesized and characterized by X‐ray diffraction and NMR spectroscopy in solution. The protonation of 4 by [H(OEt2)2][B{C6H3(CF3)2}4] yields [(3H,4H‐pyr‐ONO)(3H‐pyr‐ONO)Zr][B{3,5‐(CF3)2C6H3}4] ( 5 ), thus demonstrating the storage of three protons. 相似文献
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Induced acoustic wave to bare fiber through various types of horn are examined. The center wavelength and extinction ratio of the notch filter are dynamically tunable and dependent on the RF signals. 相似文献
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The mixed convection flow and heat transfer from an exponentially stretching vertical surface in a quiescent fluid is analyzed using similarity solution technique. Wall temperature and stretching velocity are assumed to have specific exponential function forms. The influence of buoyancy along with viscous dissipation on the convective transport in the boundary layer region is analyzed in both aiding and opposing flow situations. The flow is governed by the mixed convection parameter Gr/Re2. The velocity and temperature inside the boundary layer are observed to be influenced by the parameters like Prandtl number Pr, Gebhart number Gb. Significant changes are observed in non-dimensional skin friction and heat transfer coefficients due to viscous dissipation in the medium. The flow and temperature distributions inside the boundary layer are analyzed and the results for non-dimensional skin friction and heat transfer coefficients are discussed through computer generated plots. 相似文献
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Reversible dihydrogen uptake by a two-electron mixed-valence di-iridium complex is examined with nonlocal density-functional calculations. Optimized metrics compare favorably with crystal structures of isolated species, and the calculated activation enthalpy of acetonitrile exchange is accurate within experimental error. Dihydrogen attacks the Ir(2) core at Ir(II); the Ir(0) center is electronically saturated and of incorrect orbital parity to interact with H(2). Isomeric eta(2)-H(2) complexes have been located, and harmonic frequency calculations confirm these to be potential energy minima. A transition state links one such complex with the final dihydride; calculated atomic charges suggest a heterolytic H(2) bond scission within the di-iridium coordination sphere. This investigation also establishes a ligand-design criterion for attaining cooperative bimetallic reactivity, namely, that the supporting ligand framework has sufficient mechanical flexibility so that the target complex can accommodate the nuclear reorganizations that accompany substrate activation. 相似文献
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N‐Heterocyclic Carbene–Gold(I) Complexes Conjugated to a Leukemia‐Specific DNA Aptamer for Targeted Drug Delivery
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Weijia Niu Xigao Chen Weihong Tan Adam S. Veige 《Angewandte Chemie (International ed. in English)》2016,55(31):8889-8893
This report describes the synthesis and characterization of novel N‐heterocyclic carbene (NHC)–gold(I) complexes and their bioconjugation to the CCRF‐CEM‐leukemia‐specific aptamer sgc8c. Successful bioconjugation was confirmed by the use of fluorescent tags on both the NHC–AuI complex and the aptamer. Cell‐viability assays indicated that the NHC–AuI–aptamer conjugate was more cytotoxic than the NHC–gold complex alone. A combination of flow cytometry, confocal microscopy, and cell‐viability assays provided clear evidence that the NHC–AuI–aptamer conjugate was selective for targeted CCRF‐CEM leukemia cells. 相似文献