含单蝶状[2Fe2S]骨架的新型[FeFe]氢化酶模型物｛(μ-FcS)(μ-SMe)Fe_2(CO)_6｝的合成及其晶体结构

利用二茂铁基溴化镁(FcMgBr)与(μ-S2)Fe2(CO)6和MeI的反应,合成了一种新型的含二茂铁基[FeFe]氢化酶活性中心模型化合物——(μ-FcS)(μ-SMe)Fe2(CO)6(1),其结构经1H NMR,IR,元素分析和X-射线单晶衍射表征。1属于斜方晶系,Pna2(1)空间群,晶胞参数a=12.707(2),b=11.355(2),c=27.621(5),V=3 985.1(12)3,Z=8,Dc=1.813 g.cm-3,μ=2.395 mm-1,F(000)=2 176,R1=0.059 7,wR2=0.136 7。     

Kinetic Studies on of Veratryl the Lignin Peroxidase Catalyzed Oxidation Alcohol by H2O2 in AOT/Isooctane/ Toluene/Water Reverse Micelles

The steady state kinetics of the lignin peroxidase （LIP） catalyzed oxidation of veratryl alcohol （VA） by H2O2 in a sodium bis（2-ethylhexyl） sulfosuccinate （AOT）/isooctane/toluene/water reverse micellar medium was studied and a comparison with the corresponding aqueous medium was made to understand the effect of the reverse micellar medium on the catalytic mechanism and kinetic parameters. Results indicated that the model reaction in the AOT reverse micelle followed the ping-pong mechanism with true kcat, Km,VA and KmH2O2 being 59.6min^-1, 13.9 mmol· L^-1 and 94.8 μmol·L^-1, respectively; inhibition of high level of H2O2 on LiP followed the reversible competitive pattern with Ki being 0.140 mmol·L^-1. The reaction mechanism and inhibition pattern in the AOT reverse micellar medium were the same as those in bulk aqueous medium, but the kinetic parameters except KmH2O2 were greatly different in the two media. The kcat and Ki values in the reverse micelle were approximately 2 and 20 times smaller than the corresponding values in the aqueous solution, but the Michaelis constant of VA was approximately 100 times greater than that in the aqueous solution. The above mentioned differences in the kinetic parameters were caused by the microheterogeneity and the interface of the AOT reverse micelle, which resulted in the partitioning of VA and H2O2, and by the changes of the conformation of LiP and the reactivity of the substrates.     

含单蝶状[2Fe2S]骨架的新型[FeFe]氢化酶模型物{(μ-FeS)(μ-SMe)Fe2(CO)6}的合成及其晶体结构

利用二茂铁基溴化镁(FcMgBr)与(μ-S2)Fe2(CO)6和MeI的反应,合成了一种新型的含二茂铁基[FeFe]氢化酶活性中心模型化合物——(μ-FeS) (μ-SMe) Fe2 (CO)6(1),其结构经1H NMR,IR,元素分析和X射线单晶衍射表征.1属于斜方晶系,Pna2(1)空间群,晶胞参数a= 12....     

强光谱灯抽运87Rb激射器

提出在光谱灯中采用蘑菇形和圆饼形灯泡代替传统的球形灯,运用高功率射频源成功地点燃了这两种灯,并进行了光抽运⁸⁷Rb激射器实验。它们的发射光强分别为球形灯的2.3和2倍,对应激射器最高输出功率的最佳共振泡温度分别升高5和4℃,激射器最高输出功率由-67.5dBm分别提高到-60和-62dBm。实测⁸⁷Rb激射器的短期频率稳定度的改善与输出功率的提高相符合。 关键词：     

含双蝶状[2Fe2S]骨架的新型[FeFe]氢化酶模型物{（μ-FcS2）[Fe2（CO）6]2（μ-SMe）2}的合成及其晶体结构

利用1,1’-双锂二茂铁与(μ-S2)Fe2(CO)6和MeI反应,合成了一种新型的含二茂铁基[FeFe]氢化酶活性中心模型化合物——(μ-FcS2)[Fe2(CO)6]2(μ-SMe)2(1),其结构经1H NMR,IR和X-射线单晶衍射表征。1属于斜方晶系,Pbca空间群,晶胞参数a=10.705 8(13),b=21.721 0(3),c=21.721 0(3),V=6 533.2(14)3,Z=8,Dc=1.834 g·cm-3,μ=2.480 mm-1,F(000)=3 584,R1=0.038 8,wR2=0.085 6。