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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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自组装分子的可光切换催化

Ray G DiNardi1, Samina Rasheed1, Simona S Capomolla1

  • 1School of Chemistry, UNSW Sydney, Sydney, New South Wales 2052, Australia.

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此摘要是机器生成的。

一个具有可光切换连接体的新型协调作为迈克尔加法反应的催化剂. 这个子

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科学领域:

  • 超分子化学
  • 催化剂
  • 摄影化学

背景情况:

  • 协调为化学反应提供了封闭的环境.
  • 可光切换的配体可以在光照射时改变分子性质.
  • 通过外部刺激控制催化活动是化学的一个关键目标.

研究的目的:

  • 开发一个可光切换的催化协调.
  • 调查异质与同质的催化活性.
  • 为了证明催化功能的光诱导切换.

主要方法:

  • 合成含有亚博联体的异体质[Pd2L2L'2]4+协调.
  • 在迈克尔加法反应中对子进行催化试验.
  • 使用530nm和405nm光来控制组装和拆卸的光切换实验.

主要成果:

  • 异构有效催化了甲基乙烯基和基的迈克尔添加.
  • 缺乏可光切换连接体的同质感在催化上不活跃.
  • 子的催化活性可以通过特定的光波长进行可逆开启和关闭.

结论:

  • 具有可光切换连接体的异构协调可以作为可控制的催化剂.
  • 光诱导的可逆组装/拆卸提供了切换催化活性的机制.
  • 这项研究提出了一种对光敏感的超分子催化新策略.