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|Title:||Coordination chemistry of chromium (III) ion containing bidentate, tridentate and quadridentate organic ligands and kinetics of ligand substitution reactions of some haloamine complexes|
|Authors:||Pal, S C|
Tarafder, M T H
|Abstract:||A number of new dichloro, trichloro, thiocyanato and azido complexes of chromium(III) using diethylenetriamine (det), triethylenetetramine (tet),N,N, bis 2-aminoethyl 1,3-propanediamine (2,3,2 tet) and o-phenylenediamine have been synthesised and characterized by elemental analyses, magnetic and conductivity measurements, IR and electronic spectral studies. The complexes have the compositions, [Cr(det)X3] and [Cr(L)X2]X; [X=Cl, NCS or N3; L=tet, 2,3,2-tet or o-phenylenediamine]. The molar conductance data reveal that most of the dichloro chromium complexes and the thiocyanato complex with o-phenylenediamine are 1:1 electrolytes in DMSO while those of det, tet and 2,3,2-tet are nonelectrolytes but the azide complexes are found to be insoluble in almost all common organic solvents. Magnetic and spectral data support octahedral stereochemistry for the complexes. Kinetics of aquation of chloro complexes of Cr(III) with 1,3-diaminopropane, diethylenetriamine (det) and N,N-bis 2-aminoethyl-1,3-propanediamine (2,3,2-tet) have been investigated. This reveals that chelate effect of ligands as well as metal-ligand ring size in the complexes governs the rates of aquation. The first and second aquation rate constant values decrease with increase in derived chelate effect of the ligands. The chelate effect of the ligands used increase in the order 1,3-diaminopropane < det < 2,3,2 tet.|
|Appears in Collections:||IJC-A Vol.34A(01) [January 1995]|
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