Scientists at the Japan Institute of Molecular Sciences (IMS) have created a new recipe for coordination polymers. The work is published in the journal of the American Chemical Society.
Materials with unpaired electrons on two-dimensional honeycomb lattices have attracted a lot of attention from scientists as potential candidates for future spintronic and photonic devices, as well as next-generation electronics. A coordination polymer based on organic radicals (CP) is one of the candidates for such materials. It has a structure containing metal atoms at the center of a repeating sequence of organic radicals. Several CPs have now been prepared on a radical basis with a honeycomb lattice structure. However, deep investigation of their functions and material development are often difficult due to their instability and poor crystallinity.
Radicals are atoms or molecules with an unpaired electron in the outer shell. The lack of pairing with another electron makes it extremely reactive with other substances, so radicals tend to be very short-lived. However, there are some radicals that are durable even under everyday conditions of temperature and pressure. These stable radicals exhibit electrical, magnetic and photoemission properties similar to those of inorganic materials such as metals, oxides and chalcogenides.
The IMS team has developed a recipe for CPs that are durable in the environment. It uses a completely new triangular organic radical, the tris (3,5-dichloro-4-pyridyl) methyl radical, or trisPyM. It is not only stable, but also exhibits photoluminescence in solution and solid state. In addition, by combining trisPyM with the zinc-containing Zn (II) molecule and obtaining trisZn, scientists have developed a stable, crystalline and photoluminescent CP based on radicals with a two-dimensional honeycomb lattice structure.
TrisZn is just a proof of concept for our recipe, and many radical CPs can in principle be obtained simply by using different metal ions or metal complex elements. I hope that some of these materials will find practical use or show unprecedented possibilities. phenomena that advance the science of materials.Tetsuro Kusamoto of IMS