scholarly journals Adduct-Formation Constants of Bis(3-trifluoroacetyl-d-camphorato)copper(II) with Lewis Bases

1976 ◽  
Vol 49 (8) ◽  
pp. 2325-2326 ◽  
Author(s):  
Tsunenobu Shigematsu ◽  
Masakazu Matsui ◽  
Yoshihiro Sasaki ◽  
Matsujiro Sakurada
Keyword(s):  
Formation Constants ◽  
Adduct Formation ◽  
Lewis Bases

Thermodynamics of metal-ligand bond formation. XXIII. Lewis acidity of mercury(II) thiocyanate

1976 ◽  
Vol 29 (11) ◽  
pp. 2405 ◽  
Author(s):  
Y Farhangi ◽  
DP Graddon
Keyword(s):  
Bond Formation ◽  
Formation Constants ◽  
Adduct Formation ◽  
Lewis Acidity ◽  
Acetonitrile Solution ◽  
Enthalpies Of Formation ◽  
Dilute Solution ◽  
Lewis Bases ◽  
Metal Ligand ◽  
Ligand Bond

Thermodynamic data are reported for the reaction of Lewis bases with mercury(11) thiocyanate in acetonitrile solution. Pyridine, 4-methylpyridine and tetrahydrothiophen form 1 : 1 adducts with adduct formation constants and enthalpies of formation comparable to those with mercury(11) iodide. 1,l0-Phenanthroline, 2,2'-bipyridine and N,N,N',N?-tetramethylethane-1,2-diamine form chelate 1 : 1 adducts, but with enthalpies of formation little larger than that with pyridine. The phosphines, PPh3 and Pbu3, form 1 : 1 and 1 : 2 adducts of much greater stability, though the enthalpies of formation of these adducts are also similar to that with pyridine; Hg(SCN)2PBu3 is dimeric in dilute solution.

ChemInform Abstract: ADDUCT-FORMATION CONSTANTS OF BIS(3-TRIFLUOROACETYL-D-CAMPHORATO)COPPER(II) WITH LEWIS BASES

1976 ◽  
Vol 7 (48) ◽  
pp. no-no
Author(s):  
T. SHIGEMATSU ◽  
M. MATSUI ◽  
Y. SASAKI ◽  
M. SAKURADA
Keyword(s):  
Formation Constants ◽  
Adduct Formation ◽  
Lewis Bases

scholarly journals Thermodynamics of metal-ligand bond formation. VIII. Pyridine adducts of zinc(II) β-diketonates

1973 ◽  
Vol 26 (11) ◽  
pp. 2537 ◽  
Author(s):  
DR Dakternieks ◽  
DP Graddon
Keyword(s):  
Benzene Solution ◽  
Equilibrium Constants ◽  
Bond Formation ◽  
Formation Constants ◽  
Adduct Formation ◽  
Enthalpies Of Formation ◽  
Calorimetric Titration ◽  
Experimental Conditions ◽  
Metal Ligand ◽  
Ligand Bond

Equilibrium constants and enthalpies in benzene solution are reported for the formation of 1 : 1-adducts of pyridine with four zinc(II) complexes of β-diketones, determined by calorimetric titration. Adduct formation constants at 30�C fall in the range 300-2000 and enthalpies of formation lie between -15 and - 34 kJ mol-1. Though the enthalpies of formation differ little from those of corresponding copper(II) complexes, the adducts are about a hundred times more stable. The pyridine adduct of bis(2,2,6,6-tetramethylheptane-3,5-dionato)zinc(II) is entropy-stabilized relative to those of other complexes. No evidence was obtained for the addition of a second molecule of pyridine under the experimental conditions used.

Self-adduct formation in the extraction of cobalt(II) chelates of certain 8-quinolinols

1979 ◽  
Vol 57 (5) ◽  
pp. 580-585 ◽  
Author(s):  
Arvind T. Rane ◽  
Kashinath S. Bhatki
Keyword(s):  
Aqueous Solution ◽  
Ambient Temperature ◽  
Equilibrium Distribution ◽  
Formation Constants ◽  
Distribution Coefficients ◽  
Adduct Formation ◽  
The Self ◽  
Reagent Concentration ◽  
Pyramidal Structure ◽  
Cobalt Chelates

Equilibrium distribution ratios have been determined for the extraction of cobalt(II) with 8-quinolinol and its 2-methyl-, 4-methyl-, 5-chloro-, and 5-nitro- analogues into chloroform as a function of pH and reagent concentration at ambient temperature. Except in the case of 2-methyl-8-quinolinol, which formed a simple 1:2 chelate, the extractable complexes were mono-adducts, that is, 1:2 chelates to which a third molecule of the reagent was coordinated. The overall formation constants of the cobalt chelates in aqueous solution were determined. A linear correlationship was observed between the formation constants, adduct formation constants, and the basicity of the reagent. This dependence could be used to predict, based on known data, the stabilities of not yet studied complexes of cobalt with this family of ligands. The distribution coefficients of the chelates and the chelate adducts are discussed in terms of structural influences. A penta-coordinate, square pyramidal structure has been proposed for the self-adducts of cobalt(II) with 8-quinolinols (except 2-methyl analogue).

scholarly journals spectroscopic stury of lewis bases coordinating to vanady

2006 ◽  
Vol 3 (2) ◽  
pp. 344-347
Author(s):  
Baghdad Science Journal
Keyword(s):  
Dimethyl Sulfoxide ◽  
Formation Constants ◽  
Dimethyl Formamide ◽  
Lewis Bases

formation constants for the conrdination of aniline pyridine dimethyl sulfoxide dimethyl formamide ethanol dimethylamine have been determined the cordination

Reaction of the Five-Coordinate O-Nitrito Complex Fe(Por)(ONO) (Por = meso-tetra-arylporphyrinato) with THF Gives Two Six-Coordinate Isomers

2009 ◽  
Vol 62 (10) ◽  
pp. 1226 ◽  
Author(s):  
Tigran S. Kurtikyan ◽  
Astghik A. Hovhannisyan ◽  
Alexei Iretskii ◽  
Peter C. Ford
Keyword(s):  
Low Temperature ◽  
Density Functional ◽  
Adduct Formation ◽  
Solvent Free ◽  
Model Systems ◽  
Lewis Bases ◽  
Nitrogen Donor ◽  
Density Functional Computations

The effect of the proximal ligand on the coordination of the nitrite ligand to the heme model systems Fe(Por)(η1-ONO) (Por = meso-tetraarylporphyrinato dianion) was investigated by FTIR and UV-vis spectra in solvent free, low temperature, porous layered solids and by density functional computations. The reaction of the five-coordinate complex Fe(Por)(η1-ONO) with the ether tetrahydrofuran gives a mixture of the O-nitrito and N-nitrito isomers Fe(Por)(THF)(η1-ONO) and Fe(Por)(THF)(NO2), respectively. This observation is in contrast to earlier studies with nitrogen donor Lewis bases where the N-nitrito isomers were clearly the more stable of the six-coordinated complexes. The adduct formation is reversible; the five-coordinate O-nitrito complexes Fe(Por)(η1-ONO) were largely restored upon warming under vacuum pumping.

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