Title of article :
Structure and thermal decomposition studies on alkylcobaloxime B12 model compounds with 1,2-cyclohexanedione dioxime as equatorial ligand
Author/Authors :
Zhang Xin، نويسنده , , Han Deyan، نويسنده , , Li Yizhi، نويسنده , , Chen Huilan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
8
From page :
1121
To page :
1128
Abstract :
Crystal structures of a kind of cyclohexyl-cobaldioxime coenzyme B12 model compounds RCo(chgH)2L (R = CH3, C2H5 or C3H7, L = pyridine or H2O, chgH = 1,2-cyclohexanedione dioxime) at room and low temperatures have been determined. The results for C2H5Co(chgH)2py (1) indicate that its crystal unit parameters vary with temperatures, and two sides of cyclohexyls on the equatorial plane assume disorder accompanying a temperature dependent conformation occupation change. Interestingly, there has been observed a proton shift from one chgH ligand to the other one for 1 when the temperature decreases. Whilst a similar chair-form configuration with disordered chgH is found at 293 K for CH3Co(chgH)2py (2), C2H5Co(chgH)2H2O (3), and C3H7Co(chgH)2H2O (4), respectively. In addition, molecular and crystal packing structures, as well as thermal decomposition properties of the four complexes are investigated and compared with other cobaloxime models.
Keywords :
Cyclohexanedione dioxime , Hydrogen bond , Coenzyme B12 model , Proton shift , conformation , Thermal decomposition
Journal title :
INORGANICA CHIMICA ACTA
Serial Year :
2006
Journal title :
INORGANICA CHIMICA ACTA
Record number :
1323393
Link To Document :
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