Thio derivatives of b-diketones and their metal chelates. XXII. Dipole moments of some bivalent and trivalent metal complexes of fluorinated monothio-b-diketones

1976 ◽  
Vol 29 (4) ◽  
pp. 767 ◽  
Author(s):  
M Das ◽  
SE Livingstone ◽  
JH Mayfield ◽  
DS Moore ◽  
N Saha
Keyword(s):  
Copper Complexes ◽  
Dipole Moments ◽  
Platinum Complexes ◽  
Mean Value ◽  
Tetrahedral Configuration ◽  
Square Planar ◽  
Palladium And Platinum Complexes ◽  
Static Polarization ◽  
The Moment ◽  
Derivatives Of

Dipole moments have been determined by static polarization measurements for some iron(111), ruthenium(111), rhodium(111), nickel(11), palladium(11), platinum(11), copper(11) and zinc(11) complexes of fluorinated monothio-β-diketones RC(SH)=CHCOCF3. The moments indicate a facial-octahedral configuration for the iron, ruthenium and rhodium complexes, a cis-square-planar configuration for the nickel, palladium and platinum complexes, and a tetrahedral configuration for the zinc complexes. The copper complexes have moments 0.5-1.0 D lower than the mean value for the corresponding nickel, palladium and platinum complexes; this lowering of the moment is attributed to significant distortion from the square-planar towards the tetrahedral configuration. The dipole moments of the square-planar and octahedral complexes decrease if the R groups are arranged in the order: p-MeC6H4 ≥ 2-thienyl > β-naphthyl > m-MeC6H4 > Ph > Pr? > Bui > Me > m-ClC6H4 > m-BrC6H4 > p-FC6H4 > p-ClC6H4 > p-BrC6H4 > m,p-Cl2C6H3.

Observations on the Mechanism of Halogen-Bridge Cleavage by Unidentate Ligands in Square Planar Palladium and Platinum Complexes

1994 ◽  
Vol 47 (2) ◽  
pp. 217 ◽  
Author(s):  
DS Black ◽  
GB Deacon ◽  
GL Edwards
Keyword(s):  
Platinum Complexes ◽  
Donor Ligands ◽  
Cleavage Reaction ◽  
Nitrogen Donor Ligands ◽  
Carbon Bond ◽  
Square Planar ◽  
Nitrogen Donor ◽  
Palladium And Platinum Complexes

Cyclo-palladation and - platination of nitrogen donor ligands lead to insoluble μ- chloro dimers which give μ- bromo and μ- iodo dimers on metathesis with the appropriate lithium halide. Addition of pyridine or 2,6-dimethylpyridine to the cyclopalladated dimers gives monomeric complexes with the halogen trans to the metal-carbon bond, whereas addition of 2,6-dimethylpyridine to the cycloplatinated complexes gives the isomer with the halogen cis to the metal-carbon bond. The results are discussed in terms of the mechanism of the bridge cleavage reaction.

A cis-influence in square-planar palladium and platinum complexes

1969 ◽  
Vol 18 (2) ◽  
pp. P35-P38 ◽  
Author(s):  
C.W. Fryer ◽  
J.A.S. Smith
Keyword(s):  
Platinum Complexes ◽  
Square Planar ◽  
Palladium And Platinum Complexes

Thio derivatives of β-diketones and their metal chelates. XXIV. Dipole moments and mass spectra of chromium(III) chelates of some monothio-β-diketones

1976 ◽  
Vol 29 (9) ◽  
pp. 1913 ◽  
Author(s):  
SE Livingstone ◽  
JE Oluka
Keyword(s):  
Mass Spectra ◽  
Benzene Solution ◽  
Dipole Moments ◽  
The Other ◽  
Metal Free ◽  
Chloride Hexahydrate ◽  
Static Polarization ◽  
The Difference ◽  
Derivatives Of ◽  
Octahedral Configuration

Chromium(111) chelates of four monothio-β-diketones, RC(SH)=CHCOR? (R = R' = Ph; R = Ph, 2-thienyl, β-naphthyl, R' = CF3), have been prepared by the reaction of chromium(111) chloride hexahydrate with the monothio-β-diketone in alcohol in the presence of urea. The dipole moments of the chromium chelates were determined by static polarization measurements in benzene solution and indicate a facial-octahedral configuration. The mass spectrum of CrL3 (L = PhC(S)=CHCOPh) shows no metal-containing peaks but exhibits metal-free peaks due to the ions 2L-H2S, 2L - H2S- Ph, 2L- H2S - PhCO and 2L- H2S - PhCO - Ph. The mass spectra of the other three chromium chelates display a considerable number of peaks due to metal-containing ions, including M and M - L. The difference in these spectra from those of their cobalt(111), rhodium(111), iron(111) and ruthenium(111) analogues is discussed.

Structural study of four complexes of the M-N2S2 type derived from diethylphenylazothioformamide and the metals palladium, platinum, copper and nickel

2007 ◽  
Vol 63 (1) ◽  
pp. 151-156 ◽  
Author(s):  
Kim T. Nielsen ◽  
Pernille Harris ◽  
Klaus Bechgaard ◽  
Frederik C. Krebs
Keyword(s):  
Electron Transfer ◽  
Metal Ion ◽  
Platinum Complexes ◽  
Central Metal ◽  
Molecular Symmetry ◽  
Line Broadening ◽  
H Nmr ◽  
Square Planar ◽  
Palladium And Platinum Complexes ◽  
High Degree

The four electron-transfer complexes trans-(di(N,N-diethyl-(2-phenyldiazenyl)thioformamide-κS,κN 2))nickel, trans-(di(N,N-diethyl-(2-phenyldiazenyl)thioformamide-κS,κN 2))copper, trans-(di(N,N-diethyl-(2-phenyldiazenyl)thioformamide-κS,κN 2))palladium and trans-(di(N,N-diethyl-(2-phenyldiazenyl)thioformamide-κS,κN 2))platinum have been crystallized, and their structures have been determined at low temperature. All the complexes are of the M-N2S2 type. The crystals of both the nickel and the copper complex belong to the tetragonal P41212 system, in which the central metal ion lies on a twofold axis. The tetrahedral molecular symmetry around the central metal ion is unusual for the M-N2S2 electron-transfer complexes. The crystals of the palladium and platinum complexes on the other hand belong to the monoclinic C2/c system in which the metal ion lies on an inversion centre. The molecular symmetry around these metal ions is square planar. It is demonstrated that the π electron density in the ligand planes has a high degree of delocalization. Furthermore, unusually large line broadening of the 1H NMR spectra was observed and investigated as a function of temperature for the palladium complex.

Synthesis, characterization and biological activities of 1,3,4-oxadiazole derivatives of nalidixic acid and their copper complexes

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Nalidixic Acid ◽  
Copper Complexes ◽  
Biological Activities ◽  
Bidentate Coordination ◽  
Antibacterial And Antifungal Activities ◽  
Elemental Analyses ◽  
Oxadiazole Derivatives ◽  
Antibacterial And Antifungal ◽  
Derivatives Of ◽  
Substituted 1

A series of novel 1, 3, 4-oxadiazole analogues was synthesized from cyclization of hydrazones of substituted 1-ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carbohydrazides were prepared from nalidixic acid. The structures of synthesized oxadiazole derivatives and their copper complexes were elucidated on the basis of FTIR, elemental analyses, 1H-NMR and atomic absorption spectral analysis. It was observed from spectral data that metal ligand ratio was 1:1 in all copper complexes and they were bidentate, coordination was found to be done through oxygen of 4-oxo group and nitrogen of oxadiazole ring. The synthesized compounds were further evaluated with biological activities and compared with parent hydrazones. Copper complexes possess antibacterial and antifungal activities better than the oxadiazoles while they have better antioxidant activity then copper complexes. Parent hydrazones were better in all biological activities than synthesized oxadiazoles.

ChemInform Abstract: The Dynamic Behavior of η3-Allyl Palladium and Platinum Complexes Containing the SnCl3 Ligand.

ChemInform ◽  
1988 ◽  
Vol 19 (5) ◽  
Author(s):  
M. GIANOTTI ◽  
A. MUSCO ◽  
M. SISTI ◽  
M. GRASSI ◽  
G. GATTI
Keyword(s):  
Dynamic Behavior ◽  
Platinum Complexes ◽  
Palladium And Platinum Complexes

Synthesis and Characterization of Methyl-Palladium and -Platinum Complexes Supported by N,O- and N,S-Donor Ligands

2016 ◽  
Vol 2016 (6) ◽  
pp. 874-879 ◽  
Author(s):  
Daniel Ruiz Plaza ◽  
José C. Alvarado-Monzón ◽  
Gabriel A. Andreu de Riquer ◽  
Gerardo González-García ◽  
Herbert Höpfl ◽  
...  
Keyword(s):  
Platinum Complexes ◽  
Donor Ligands ◽  
Synthesis And Characterization ◽  
Palladium And Platinum Complexes
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