Aminolysis of bis[bis(trimethylsilyl)amido]-manganese, -iron, and -cobalt for the synthesis of mono- and bis-silylene complexes

2020 ◽  
Vol 49 (36) ◽  
pp. 12586-12591
Author(s):  
Zhiyuan He ◽  
Xiaolian Xue ◽  
Yilan Liu ◽  
Na Yu ◽  
Jeremy P. Krogman
Keyword(s):  
Metal Complexes ◽  
High Yield ◽  
Silylene Complexes

Mono- and bis-silylene metal complexes may be synthesized in high yield from M{N(SiMe3)2}2 and PhC(NtBu)2SiHCl2.

scholarly journals Di(μ-phosphido)cobalt-und -nickel-Verbindungen mit Trimethylphosphanliganden/ Di(μ-phosphido)cobalt and Nickel Compounds with Trimethylphosphine Ligands

1988 ◽  
Vol 43 (8) ◽  
pp. 927-932 ◽  
Author(s):  
Hans-Friedrich Klein ◽  
Michael Gaß ◽  
Ulf Zucha ◽  
Brigitte Eisenmann
Keyword(s):  
Metal Complexes ◽  
High Yield ◽  
Symmetric Products ◽  
Space Group ◽  
Mixed Metal ◽  
Nickel Compounds ◽  
Mixed Metal Complexes ◽  
Cobalt And Nickel

AbstractSeveral fortuitous preparations and high yield rational syntheses for [(Me3P)2M(PMe2)]: (1: M = Co; 2: M = Ni) are described. 1 crystallizes in the space group P1̄ (no. 2); a = 975.6(5). b = 943.6(5), c - 904.2(5) pm. α= 63.8(1)°, β = 79.1(1)°, γ = 72.8(1)°. Mixed metal complexes L2Co(PR2)2NiL2 (L = PMe3; R = Me, Ph) evaded detection giving symmetric products exclusively. An improved synthesis of LiP(C6H5)2·dioxane is also described.

scholarly journals A highly potent ruthenium(II)-sonosensitizer and sonocatalyst for in vivo sonotherapy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chao Liang ◽  
Jiaen Xie ◽  
Shuangling Luo ◽  
Can Huang ◽  
Qianling Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Metal Complexes ◽  
Simple Structure ◽  
Basic Structure ◽  
High Yield ◽  
Tissue Penetration ◽  
Facile Synthesis ◽  
Sonodynamic Therapy

AbstractAs a basic structure of most polypyridinal metal complexes, [Ru(bpy)3]2+, has the advantages of simple structure, facile synthesis and high yield, which has great potential for scientific research and application. However, sonodynamic therapy (SDT) performance of [Ru(bpy)3]2+ has not been investigated so far. SDT can overcome the tissue-penetration and phototoxicity problems compared to photodynamic therapy. Here, we report that [Ru(bpy)3]2+ is a highly potent sonosensitizer and sonocatalyst for sonotherapy in vitro and in vivo. [Ru(bpy)3]2+ can produce singlet oxygen (1O2) and sono-oxidize endogenous 1,4-dihydronicotinamide adenine dinucleotide (NADH) under ultrasound (US) stimulation in cancer cells. Furthermore, [Ru(bpy)3]2+ enables effective destruction of mice tumors, and the therapeutic effect can reach deep tissues over 10 cm under US irradiation. This work paves a way for polypyridinal metal complexes to be applied to the noninvasive precise sonotherapy of cancer.

scholarly journals Synthese und Reaktivität von Silicium-Übergangsmetallkomplexen, XIV [1] Umsetzung von Cp(CO)2Fe-substituierten Silieium-Wasserstoff-Verbindungen mit DicobaJtoctacarbonyl: Synthese von Siliciumverbindungen mit zwei, drei und vier Übergangsmetall -Liganden / Synthesis and Reactivity of Silicon Transition Metal Complexes, XIV [1] Reaction of Cp(CO)2Fe-Substituted Silanes with Dicobaltoctacarbonyl: Synthesis of Silicon Compounds with Two, Three and Four Transition Metal Ligands

1982 ◽  
Vol 37 (5) ◽  
pp. 601-609 ◽  
Author(s):  
Wolfgang Malisch ◽  
Hans-Ulrich Wekel ◽  
Irmgard Grob ◽  
Frank H. Köhler
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
High Yield ◽  
Silicon Compounds ◽  
Metal Ligands ◽  
Composition And Structure ◽  
First Time ◽  
Transition Metal Ligands ◽  
Heteronuclear Complex

The reaction of Cp(CO)2Fe-SiHCl2 with Co2(CO)8 yields the heteronuclear complex Cp(CO)2Fe-SiCl2-Co(CO)4 (1) and HCo(CO)4.1 is degradated by AgBF4 to Cp(CO)2Fe-SiF3. PMe3 transforms 1 to Cp(CO)2Fe-SiCl2-Co(CO)3PMe3 (2). LnM-SiH2Me reacts with Co2(CO)8 to give LnM-SiMe-Co2(CO)7 [LnM = Cp(CO)2Fe (3a), Cp(CO)2PMe3W (3b)]. Starting with Cp(CO)2Fe-SiH3, μ3-Cp(CO)2Fe-SiCo3(CO)9 (4), the second example of a μ3-metallosilylidine tricobalt cluster is obtained in high yield, which is cleaved by acetic acid to Cp(C0)2Fe-Si[OC(O)Me]3 (5). The composition and structure of the silicon transition metal complexes 1-5 is proved by NMR, IR and mass spectroscopy. 29Si NMR shifts are determined for the first time for a tri- and tetra-metalated silicon species

High-yield synthesis of potentially ditopic coordinating cryptands and their metal complexes

2013 ◽  
Vol 54 (26) ◽  
pp. 3363-3365 ◽  
Author(s):  
Laura Chaloner ◽  
Xavier Ottenwaelder
Keyword(s):  
Metal Complexes ◽  
High Yield

Quality films from carbon fiber evaporation for thorough coverage of TEM grids

1988 ◽  
Vol 46 ◽  
pp. 418-419
Author(s):  
N. Tempel ◽  
M. C. Ledbetter
Keyword(s):  
Electron Microscopy ◽  
High Resolution Electron Microscopy ◽  
Carbon Films ◽  
Low Noise ◽  
Vacuum Evaporation ◽  
High Yield ◽  
Good Adhesion ◽  
Noise Structure ◽  
Resolution Electron ◽  
Carbon Foils

Carbon films have been a support of choice for high resolution electron microscopy since the introduction of vacuum evaporation of carbon. The desirable qualities of carbon films and methods of producing them has been extensively reviewed. It is difficult to get a high yield of grids by many of these methods, especially if virtually all of the windows must be covered with a tightly bonded, quality film of predictable thickness. We report here a method for producing carbon foils designed to maximize these attributes: 1) coverage of virtually all grid windows, 2) freedom from holes, wrinkles or folds, 3) good adhesion between film and grid, 4) uniformity of film and low noise structure, 5) predictability of film thickness, and 6) reproducibility.Our method utilizes vacuum evaporation of carbon from a fiber onto celloidin film and grid bars, adhesion of the film complex to the grid by carbon-carbon contact, and removal of the celloidin by acetone dissolution. Materials must be of high purity, and cleanliness must be rigorously maintained.

Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites

1990 ◽  
Vol 48 (4) ◽  
pp. 876-877
Author(s):  
Hong-Ming Lin ◽  
C. H. Liu ◽  
R. F. Lee
Keyword(s):  
High Pressure ◽  
Carbon Fiber ◽  
Sample Surface ◽  
High Yield ◽  
Fiber Reinforced ◽  
Laminate Composites ◽  
Peek Composite ◽  
Continuous Carbon Fiber ◽  
Carbon Fiber Reinforced

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes

2020 ◽  
Vol 7 (3) ◽  
pp. 786-794 ◽  
Author(s):  
Jingqi Han ◽  
Kin-Man Tang ◽  
Shun-Cheung Cheng ◽  
Chi-On Ng ◽  
Yuen-Kiu Chun ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Carbene Complexes ◽  
New Class

A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.

Catalytic enantioselective synthesis of indolizino[8,7-b]indole alkaloid derivatives based on the tandem reaction of tertiary enamides

2021 ◽  
Author(s):  
Xin-Ming Xu ◽  
Ming Xie ◽  
Jiazhu Li ◽  
Mei-Xiang Wang
Keyword(s):  
Indole Alkaloid ◽  
Enantioselective Synthesis ◽  
High Yield ◽  
Tandem Reaction ◽  
Indole Derivatives

An exquisite Pybox/Cu(OTf)2-catalyzed asymmetric tandem reaction of tertiary enamides was developed, which enabled the expeditious synthesis of indolizino[8,7-b]indole derivatives in high yield, excellent enantioselectivity and diastereoselectivity.

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