Thermokinetics on the reaction of formation of the ternary complex Nd[(C5H8NS2)3(C12H8N2)]
β Scribed by Xue-Zhong Fan; Xiang-Xin Meng; San-Ping Chen; Bao-Juan Jiao; Yi-Xia Ren; Sheng-Li Gao; Qi-Zhen Shi
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 434 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0256-7660
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β¦ Synopsis
The title ternary complex Nd [(C5H8NS&(ClzH8N2)] has been synthesized in absolute ethanol by the reaction of NdCI3-3.74H20 with ammonium pyrrolidmyldifhiocaboxylate (APDC) and 1.10-phenanthroline (phen*H20) at air atmosphere without any cautions against moisture. The bonding characteristics of the complex were characterized by JR, showing that Nd3+ is bonded with sulfur atom in the APDC and coordinated with nitrogen atom in the phen. TG-DTG investigation indicates that the title complex was decomposed into NdzS3 and deposited carbon in one step where Nd2S3 predominated in the final products. The enthalpy change of formation of the reaction on the title complex in liquid-phase has been determined by a microcalorimeter. Thermodynamic parameters (the activation enthalpy, the activation entropy and the activation free energy) and kinetics parameters (the rate constant, the apparent activation energy, the pre-exponential constant and the reaction order) of the title reaction have been calculated. The enthalpy change of the sotid-phase reaction has been obtained by a thennochemistry cycle.
π SIMILAR VOLUMES
The kinetics of the gas-phase dehydrogenation of cyclopentane to cyclopentene is found to be consistent with a slow attack by a n I atom (step 4, text) on cyclopentane in the range 282-382OC. The measured rate constants fit the Xrrhenius equation, log k, = 11.95 f 0.08 -(24.9 f 0.23)/0 1 mole-l sec-
Reduction reactions involving more than two electrons are not common for metal complexes containing just one metal. In f-element chemistry, multielectron reductions from monometallic species are particularly rare since the common lowvalent ions Th III , U III , Eu II , Yb II , Sm II , and Tm II ty
The gas-phase dehydrogenation of cyclopentene to cyclopentadiene catalyzed by iodine in. the range 178-283'C has been found to obey a rate law consistent with the slow rate-determining step, I + c-C5Hs --t HI + c-C5H, , log [ka/(l moleL1 sec-')I = 10.25 \* 0.08 -(12.26 f 0.18)/0, where 0 = 2.303RT i