Geometrical isomerism in cyclic P-hydrogen phosphites. New route to cis-2-hydroxy-4-methyl-2-thio-1,3,2-dioxaphosphorinan

1969 ◽  
Vol 0 (20) ◽  
pp. 1221-1221 ◽  
Author(s):  
M. Mikołajczyk
Keyword(s):  
Geometrical Isomerism

unsaturated acids—geometrical isomerism

1965 ◽  
pp. 140-144
Author(s):  
C.G. LYONS ◽  
S. McLINTOCK ◽  
NORA H. LUMB
Keyword(s):  
Geometrical Isomerism

Geometrical isomerism in unsaturated sulphide-sulphones and disulphones—I

Tetrahedron ◽  
1975 ◽  
Vol 31 (5) ◽  
pp. 465-468 ◽  
Author(s):  
M.S.R. Naidu ◽  
S.G. Peeran
Keyword(s):  
Geometrical Isomerism

Polyamine ligands. II. Nickel(II) complexes with the tridentate ligand 5-(2'-Pyridyl)-3-azapentan-1-amine

1970 ◽  
Vol 23 (11) ◽  
pp. 2257 ◽  
Author(s):  
AT Casey ◽  
W Peters ◽  
AT Phillip
Keyword(s):  
Electronic Absorption Spectra ◽  
Complex Structure ◽  
Molar Conductance ◽  
Tridentate Ligand ◽  
Tridentate Ligands ◽  
Nickel Ion ◽  
First Order ◽  
Distorted Octahedral ◽  
Geometrical Isomerism ◽  
Structure In Solution

The tridentate amine 5-(2'-pyridyl)-3-azapentane-1-amine (pap) forms a series of stable nickel(II) complexes of the composition Ni(pap)X2 (X = Cl, Br, I, NO3, SCN, �SO4) and [Ni(pap)2]X2 (X = ClO4, I). Measurements of their electronic absorption spectra, infrared spectra, molar conductance, and magnetic susceptibility indicate that the complexes contain the amine coordinating as a tridentate ligand. In general, the Ni(pap)X2 compounds appear to possess a tetragonally distorted, octahedral structure with bridging anions in the solid state and a solvated complex structure in solution. The [Ni(pap)z]X2 compounds contain two tridentate ligands coordinated to one nickel ion, forming the octahedral NiN6 structure. Geometrical isomerism has been observed in the [Ni(pap)2]I2 compound which can be isolated as a yellow or a pink modification; this isomerism has been attributed to the alternative modes of coordination by the tridentate ligand. The isomerization of the unstable yellow form to the more stable pink form has been followed spectrophotometrically at 28� and appears to be first order in concentration.

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