Chiral nonracemic C 2-symmetry biphenyls by desymmetrization of 6,6′,2,2′-tetramethoxy-1,1′-biphenyldoi:10.1016/S0957-4166(00)00410-9Regioselective bromination of the title biphenyl 1 at the 3 and 3′ positions and simultaneous desymmetrization of the biphenyl has been achieved. Metal–...
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Switching the symmetry of a trinuclear copper cluster catalyst for electroreducing CO2 to an asymmetric C2 product in an acidic electrolyte. ACS Catalysis, 2024. DOI: 10.1021/acscatal.3c03755
总的来说,该项工作展示了一种不对称晶体配位催化剂的结构设计策略,使得在酸性电解质中实现CO2电还原转化为高附加值的C2产品成为可能。 Switching the symmetry of a trinuclear copper cluster catalyst for electroreducing CO2 to an asymmetric C2 product in an acidic electrolyte. ACS Catalysis, 2024. DOI: 1...
center of symmetry 对称中心center pedestal 中央操纵台center pit 中心孔center pole 中央支柱center producer 中央生产井center punch 中心冲center rest 中心托架center roof vent 中心通气孔center shaft 中心轴center spear 定心打捞矛center split pipe 对开管center split supporting ring 半圆支承环center sub 中心...
colour symmetry 色对称colour television 彩色电视colour television camera 彩色电视摄影机colour temperature 色温colour temperature meter 色温计colour test 色试验colour tone 色调colour top 色陀螺colour triangle 原色三角colour vision 色视觉colour-blind emulsion 色盲乳剂colour-blind film 色盲膜colour-brghtness ...
1、旋转对称Rotation about an n-fold axis of symmetry 一个分子可以同时有多个Cn轴,但n值最高的为主轴。以BF3为例,有C3轴同时也拥有三个C2对称轴,但C3为主轴。有时,低阶轴与主轴可以重合。例如: 图一BF3的主轴 图二C2与C4主轴重合 2、反射对称Reflection through a plane of symmetry(mirror plane) ...
Switching the symmetry of a trinuclear copper cluster catalyst for electroreducing CO2 to an asymmetric C2 product in an acidic electrolyte. ACS Catalysis, 2024. DOI: 10.1021/acscatal.3c03755
13.A rope rests on two slopes which form a V shape, as shown in the figure below. They are both inclined at an angleθto the horizontal. The rope has uniform mass density, and its coefficient of friction with the slopes is1. The system has left-right symmetry. ...
实空间没有，但是k空间可以有，如果电子占据是闭壳层的话