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| | VB[2 model molecule, cyano - N - methyl - 3 - imidazolyl cohyrinate perehlorat 8 was synthesized from the vitamin 612.8 was treated with acidic buffers in methanol to give compounds 9 and 10. UV - Vis spectra were determined in buffers of different pH values and equilibrium constants of Co -N bonds were calculated .The strength of coordination valence between the central Co atom of eobyrin ring with the N atom of isolated N - methylimidazole ligand is weaker than that of ligand linked with eobyr... | | 合成了维生素B_(12)(VB_(12))模型分子—单腈N-甲基3-咪唑基钴啉酯高氯酸盐8。通过8在不同pH缓冲溶液中的UV-Vis谱,计算了Co—N键的平衡常数,独立配位体N-甲基咪唑与咕啉环中心钴原子配位键的键强与自身键连配位体的配位键强要弱。 | | 文摘来源 | | The author, applying some basic principles and methods for coordination valence, classifies verbs in Uygur language and discusses its subclassification and verbs with valence. | | 运用配价理论的一些基本原则和方法,对维吾尔语动词进行了分类,并讨论了它们的下位分类及兼价动词。 | | 文摘来源 | | Cyclohexyl hydroperoxide (CHHP) decomposed to cyclohexanone and cyclohexanol was studied over chromium containing molecular sieve catalysts. Under the reaction conditions of a reaction temperature of 80 ℃ , a reaction time of 1 h, with 1% catalyst in the reaction system and under atmospheric pressure,the decomposition conversions of CHHP over Cr-Silicalite-1 and Cr-APO-5 were 96.7% and 86.8%, respectively; the total selectivity for cyclohexanone and cyclohexanol over Cr-Silicalite-1 and Cr-APO-5 were 113. 4... | | 研究了含铬分子筛催化环己基过氧化氢分解制备环己酮(醇)的反应。结果表明,在分子筛质量分数为1%、常压、80℃、反应1 h的条件下,Cr-Silicalite-1和Cr-APO-5分子筛催化分解转化率分别达到96.7%和86.8%,环己酮和环己醇总选择性分别为113.4%和117.9%。铬流失是造成含铬分子筛不可逆失活的原因,分子筛骨架中高度分散的六配位铬原子具有较好的催化活性和稳定性。 | | 文摘来源 | |   |
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