On-surface isostructural transformation from a hydrogen-bonded network to a coordination network for tuning the pore size and guest recognition.

On-surface isostructural transformation from a hydrogen-bonded network to a coordination network for tuning the pore size and guest recognition.
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从氢键网络到配位网络的表面同构转变,用于调节孔径和客体识别

DOI:
10.1039/d0sc05147k
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发表时间:
2020-11-13
期刊:
影响因子:
8.4
通讯作者:
Zhang JP
Zhang JP
中科院分区:
化学1区
文献类型:
--
作者:
Zhou DD;Wang J;Chen P;He Y;Wu JX;Gao S;Zhong Z;Du Y;Zhong D;Zhang JP

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在表面上合理地操纵超分子结构是非常重要和具有挑战性的。我们发现,金属表面上的咪唑基氢键网络可以转化为一个同构的配位网络,便于调节孔径和客体识别行为。在Au(111)/Ag(111)表面上沉积三角形的苯并三咪唑(H3 btim)分子,得到了由双N-H-N氢键连接的蜂窝状网络.当Au(111)上的H3 btim氢键网络在453 K以上蒸发时,Ag(111)上的H3 btim氢键网络在423 K时通过非常规的金属酸置换反应(Ag还原H+)转变为基于双N-Ag-N键的同构[Ag 3(btim)]配位网络。这种转变使蜂窝状网络的孔径从3.8 μ m扩大到6.9 μ m,基于尺寸相容性机制,对富勒烯和二茂铁分子给出了显着不同的主客体识别行为。
Rational manipulation of supramolecular structures on surfaces is of great importance and challenging. We show that imidazole-based hydrogen-bonded networks on a metal surface can transform into an isostructural coordination network for facile tuning of the pore size and guest recognition behaviours. Deposition of triangular-shaped benzotrisimidazole (H3btim) molecules on Au(111)/Ag(111) surfaces gives honeycomb networks linked by double N–H⋯N hydrogen bonds. While the H3btim hydrogen-bonded networks on Au(111) evaporate above 453 K, those on Ag(111) transform into isostructural [Ag3(btim)] coordination networks based on double N–Ag–N bonds at 423 K, by virtue of the unconventional metal–acid replacement reaction (Ag reduces H+). The transformation expands the pore diameter of the honeycomb networks from 3.8 Å to 6.9 Å, giving remarkably different host–guest recognition behaviours for fullerene and ferrocene molecules based on the size compatibility mechanism.
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