Transition metal complexes of unstable ylides. 6. Synthesis of five- and six-membered ylide-chelate complexes by the reaction of pentacarbonyl(dimethyloxosulfonium methylide)chromium(0) with bis(arsines) of the type (R2As)2X (X = C:PPh3, NMe, O, S) and 1,2-ethylenebis(phosphines) and -bis(arsines)

1985 ◽  
Vol 4 (5) ◽  
pp. 841-846 ◽  
Author(s):  
Lothar. Weber ◽  
Dietmar. Wewers
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Chelate Complexes

Übergangsmetallkomplexe instabiler Ylide, X [1] Chemische und elektrochemische Untersuchungen zu den Redox-Eigenschaften cyclischer Tetracarbonylchrom-Ylidchelatkomplexe / Transition Metal Complexes of Unstable Ylides, X [1] Chemical and Electrochemical Investigations of the Redox Properties of Cyclic Tetracarbonylchromium-Ylide-Chelate-Complexes

1987 ◽  
Vol 42 (7) ◽  
pp. 892-896 ◽  
Author(s):  
Lothar Weber ◽  
Ewald Lücke ◽  
Ulrich Kölle ◽  
S. Ohst
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
General Type ◽  
Oxidation Process ◽  
Radical Cations ◽  
Redox Properties ◽  
Chelate Complexes

Abstract Treatment of the ylide chelate complexes (CO)4 (1) with (C5H5)2Fe+PF6- leads to the organometallic radical cations 2. The oxidation process of 1 is also checked electrochemically by means of cyclovoltammetry, which exhibits a reversibel one electron oxidation between -0.1 and +0.3 V vs. SCE. These potentials are more negative than in any other complex of the general type Cr(CO)4L2 (L e.g. = PR3, CNR).

Transition metal complexes of a sterically demanding diimine ligand

2005 ◽  
Vol 83 (5) ◽  
pp. 477-484 ◽  
Author(s):  
Jason D Masuda ◽  
Douglas W Stephan
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Key Words ◽  
Transition Metal Complexes ◽  
Metal Halide ◽  
Chelate Complexes ◽  
X Ray ◽  
Diimine Ligands ◽  
Sterically Demanding ◽  
Diimine Ligand

The reaction of the metal halide with the sterically demanding ligand (i-Pr2C6H3N)(C(Me)(NC6H3-i-Pr2))2 afforded the complexes (i-Pr2C6H3N)(C(Me)(NC6H3-i-Pr2))2MX2 (X = Cl, M = Fe (2), Co (3); X = Br, M = Ni (4), M = Cu (5), Zn (6)). The species of 2 reacts with Li(OEt2)B(C6F5)4 to form the yellow adduct [(i-Pr2C6H3N)(C(Me)(NC6H3-i-Pr2))2Fe(µ-Cl)2Li(OEt2)2][B(C6F5)4] (7) while alkylation of 2 gave (i-Pr2C6H3N)(C(Me)(NC6H3-i-Pr2))2FeClCH2SiMe3 (8). The species [(i-Pr2C6H3N)(C(Me)(NC6H3-i-Pr2))2Ni(η3-C3H5)][B(3,5-CF3C6H3)4] (9) was obtained from reaction of 1 with [(η3-C3H5)NiBr]2 and [Na][B(3,5-(CF3)2C6H3)4] while reaction of 4 with Super-Hydride afforded (i-Pr2C6H3N)(C(Me)(NC6H3-i-Pr2))2NiH2BEt2 (10). X-ray data are reported for 2–10. The sterically demanding nature of the ligand inhibits subsequent reactivity of these species. Key words: sterically demanding ligands, chelate complexes, X-ray structure, diimine ligands.

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.

Density Functional Calculations of EPR Parameter g Tensors of Some Transition Metal Complexes

2011 ◽  
Vol 2 (2) ◽  
pp. 139-141
Author(s):  
Vinita Prajapati ◽  
◽  
P.L.Verma P.L.Verma ◽  
Dhirendra Prajapati ◽  
B.K.Gupta B.K.Gupta
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Density Functional Calculations ◽  
Density Functional

Synthesis, Characterization and in vitro Biological Evaluation of a New Schiff Base Derived from Drug and its Complexes with Transition Metal Ions

2018 ◽  
Vol 69 (7) ◽  
pp. 1678-1681
Author(s):  
Amina Mumtaz ◽  
Tariq Mahmud ◽  
M. R. J. Elsegood ◽  
G. W. Weaver
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Biological Evaluation ◽  
Pyridoxal Hydrochloride

New series of copper (II), cobalt (II), zinc (II), nickel (II), manganese (II), iron (II) complexes of a novel Schiff base were prepared by the condensation of sulphadizine and pyridoxal hydrochloride. The ligand and metal complexes were characterized by utilizing different instrumental procedures like microanalysis, thermogravimetric examination and spectroscopy. The integrated ligand and transition metal complexes were screened against various bacteria and fungus. The studies demonstrated the enhanced activity of metal complexes against reported microbes when compared with free ligand.

DNA Binding Mode of Transition Metal Complexes, A Relationship to Tumor Cell Toxicity

2014 ◽  
Vol 21 (26) ◽  
pp. 3081-3094 ◽  
Author(s):  
M. Ashfaq ◽  
T. Najam ◽  
S.S.A. Shah ◽  
M.M. Ahmad ◽  
S. Shaheen ◽  
...  
Keyword(s):  
Dna Binding ◽  
Transition Metal ◽  
Tumor Cell ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Binding Mode ◽  
Cell Toxicity
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