Title of article
Synthesis, characterisation and substitution kinetics of unusually labile trans-[Co(tmen)(diamine)Cl2]+ complexes
Author/Authors
W. Gregory Jackson، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
7
From page
2121
To page
2127
Abstract
The mixed diamine complexes trans-[Co(tmen)(diamine)Cl2]+ have been synthesised (tmen = NH2C(Me)2C(Me)2NH2; diamine = en = NH2(CH2)2NH2, and ibn = NH2C(Me)2CH2NH2). Replacement of one en ligand in trans-[Co(en)2Cl2]+ by one tmen ligand engenders an enormous rate enhancement (2000-fold) for acid hydrolysis. Solvolysis rates have been measured in Me2SO and DMF for these complexes and also trans-[Co(tmen)2Cl2]+ which is more reactive again (104-fold). The measured reactivities in DMF at 2 °C establish that the kinetic effect of replacing each en by tmen is incremental, and the extreme base catalysed racemisation rate for (+)-[Co(tmen)3]3+ can now be explained on this basis.
Keywords
Werner complexes , Aquation kinetics , Inorganic synthesis , Cobalt(III) , Tetramethylethylenediamine , Isobutylenediamine , Stereochemistry
Journal title
INORGANICA CHIMICA ACTA
Serial Year
2006
Journal title
INORGANICA CHIMICA ACTA
Record number
1323579
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