化学Chemistry
Electron in a cube: Synthesis and characterization of perfluorocubane as an electron acceptor
作为电子受体的全氟苯的合成和表征
作者:MASAFUMI SUGIYAMA, MIDORI AKIYAM, YUKI YONEZAWAKENJI, XKYOKO NOZAKI, AND TAKASHI OKAZOE, etc.
链接:
https://www.science.org/doi/10.1126/science.abn8699
摘要:
近60年前,合成立方体形状的碳氢化合物是化学上的一个重大事件,因为这种化合物十分美丽、高度对称,有着明显非自然的几何键形状。
作者现在已经合成了一种立方体衍生物,并在结构上对其进行了表征,其中每个顶点的氢原子都被氟取代。与理论预测一致,低温电子自旋共振光谱表明,分子在还原时集中内在化一个电子。
Abstract:
The synthesis of a cube-shaped hydrocarbon nearly 60 years ago was a major event in chemistry, both because of the compound’s beautiful, high symmetry and its distinctly unnatural bonding geometry. Sugiyama et al. have now synthesized and structurally characterized a cubane derivative in which the hydrogen atoms at each vertex are replaced by fluorines. Consistent with theoretical predictions, low-temperature electron spin resonance spectroscopy suggests that the molecule centrally internalizes an electron upon reduction.
Controlled tough bioadhesion mediated by ultrasound
超声介导的可控坚韧生物黏附
作者:ZHENWEI MA, CLAIRE BOURQUARD, QIMAN GAO, SHUAIBING JIANG, TRISTAN DE IURE-GRIMMEL, RAN HUO, XUAN LI, ZIXIN HE, ZHEN YANG, JIANYU LI
链接:
https://www.science.org/doi/10.1126/science.abn8699
摘要:
组织黏接剂在临时或永久组织修复、伤口管理和可穿戴电子设备的附着中都能发挥作用。然而,使用时,需要调整黏附强度以确保可逆性并保持渗透性,这可能是一个挑战。
作者设计了由聚丙烯酰胺(N异丙基丙烯酰胺)与海藻酸盐结合制成的水凝胶,使用含有壳聚糖、明胶或纤维素纳米晶体纳米颗粒的溶液进行填充。超声的应用引起空化,将引物分子推入组织。
锚钉的机械联锁最终导致水凝胶和组织之间不需要化学结合的强黏附。在猪、鼠皮肤上按需剥离可增强黏附性能和界面疲劳抗力。
Abstract: