Cumulative double-photon Z-type photocatalyst, and preparation method and application thereof

Abstract

The invention discloses a cumulative double-photon Z-type photocatalyst, and a preparation method and application thereof. According to the cumulative double-photon Z-type photocatalyst, each cell unit comprises a 9,10-anthracene diacrylate ligand, a dipyridine naphthalimide ligand and a metal ion, wherein the metal ion is a cadmium ion or manganese ion. According to the invention, an organic semiconductor material with cumulative double-photon absorption capacity is selected, secondary excitation of electrons is realized by accumulating and absorbing two photons, and a Z-type photocatalysis system based on a single system is constructed, so that possibility of the electron flow direction of a type II heterojunction is thoroughly avoided; contact resistance between interfaces is not required to be overcome, so that electrons are transmitted in a same molecule and have highest theoretical transmission efficiency and speed; a reduction potential of a conduction band can be pushed to a negative value by accumulating and absorbing the two photons, and the reduction potential greatly exceeds the reduction potential of most organic matter, so that high-efficiency photocatalytic dehalogenation is realized.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a cumulative two-photon Z-type photocatalyst and its preparation method and application. Background technique [0002] Halogenated hydrocarbons are important intermediates in organic synthesis, and the preparation of corresponding free radical intermediates through efficient dehalogenation is an important means to achieve complex organic synthesis. However, due to the high bond energy of the carbon-halogen bond, most of the current synthetic strategies can only select relatively active iodides or bromides containing electron-withdrawing groups, rather than unsubstituted bromides or even various chlorides due to the corresponding carbon -The halogen bond energy is too high, it is often difficult to play a role, and it becomes a bottleneck obstacle in the target organic synthesis technology. The development of new and efficient dehalogenation technology is urgent...

AI Technical Summary

Problems solved by technology

However, the construction of the current Z-type photocatalytic system is basically based on a single excited electron, that is, single-photon absorption. The energy of the highest-energy blue light photon is only 270 KJ / mol, while the general C-Br bond energy is greater than 280 KJ / mol. The C-Cl bond energy is as high as 340 KJ / mol, so the energy of a single photon is far from meeting the dissociation of the carbon-halogen bond

In addition, this type of system often has shortcomings such as large interfacial electron transport resistance, long electron transport distance, and type II heterojunction competition, which fundamentally restricts the possibility of its efficient photocatalytic dehalogenation.

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