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Synthesis and characterization of some cobalt(II) complexes with piperazine derivatives and synthesis of 1,4-diphenyl-1,4-diphosphorinane
Author
Loh, Choong Seng
Supervisor
Chu, Chit Kay
Abstract
The project is divided into two parts, viz.
(i) synthesis and characterization of cobalt complexes with piperazine derivatives and,
(ii) synthesis of 1,Cdiphenyl-1.4-dilphosphorinane.
Stable hydrate isomers of icobalt(I1) complexes were obtained with 1-methylpiperazine acting as a chelating agent. The results indicated that the heterocyclic ligand is effective in stabilizing the +2 oxidation state of cobalt or the formation of cobalt complexes with low coordination number. This is probably associated with the structure of the ligand. Two long-chained cobalt complexes were also synthesized in which the hydrophobic group is made up of piperazine derivatives.
The second part of the project involves the preparation of 1,Cdiphenyl-1,4-phosphorinane. In an attempt to mimic a iiterature method (Hinton and Mann) [15], ethylenebis(triphenylphosphonium) dibromide was treated with sodium borohydride and the results showed that the pheny! group cannot be displaced in contrast with a benzyl group which was removed in the reported method. Hence, the use of organometallic reagents prepared from magnesium and lithium were employed. The results indicated the possibility of using these reagents for the synthesis of the named compound.
(i) synthesis and characterization of cobalt complexes with piperazine derivatives and,
(ii) synthesis of 1,Cdiphenyl-1.4-dilphosphorinane.
Stable hydrate isomers of icobalt(I1) complexes were obtained with 1-methylpiperazine acting as a chelating agent. The results indicated that the heterocyclic ligand is effective in stabilizing the +2 oxidation state of cobalt or the formation of cobalt complexes with low coordination number. This is probably associated with the structure of the ligand. Two long-chained cobalt complexes were also synthesized in which the hydrophobic group is made up of piperazine derivatives.
The second part of the project involves the preparation of 1,Cdiphenyl-1,4-phosphorinane. In an attempt to mimic a iiterature method (Hinton and Mann) [15], ethylenebis(triphenylphosphonium) dibromide was treated with sodium borohydride and the results showed that the pheny! group cannot be displaced in contrast with a benzyl group which was removed in the reported method. Hence, the use of organometallic reagents prepared from magnesium and lithium were employed. The results indicated the possibility of using these reagents for the synthesis of the named compound.
Date Issued
1997
Call Number
QD181.C6 Loh
Date Submitted
1997