| Summary: | 碩士 === 義守大學 === 生物技術與化學工程研究所碩士班 === 95 === Alkylcobalt macrocycles are often used to investigate the cobalt-carbon bond energy owing to its similar structure with coenzyme B12. In this thesis the reaction of cobalt macrocyclic complex with alkyl hydroperoxide was used to synthesize RCo(tim)(H2O)(ClO4)2 (R=CH3，C2H5; tim = 2,3,9,l0-tetramethyl-1,4,8,11-
tetraazacyclotetradeca-1,3,8,10-tetrane). The complex of C2H5Co(tim)(H2O)(ClO4)2 crystallizes in the monoclinic space group P21/c with Z = 4. The unit cell dimensions are a = 11.8752 (11) Å, b = 15.0797 (14) Å, c = 13.4884 (12) Å, β= 98.845(2)° and V= 2386.7(4) Å3. The reduction reaction of organocobalt complex with Cr2+ ion were studied under pseudo-first-order condition and the rate law was determined as:
Rate = k[RCo(tim)(H2O)2+][ Cr2+] (R=CH3，C2H5)
The thermal activation parameters(ΔH‡、ΔS‡) were also determined. The influence
of the size of the alkyl group on the cobalt, the structure of the ligand for this reaction was discusse.
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