Unexpected Strong Antiferromagnetic Interaction in [CuCyclam][Ni(1,2‐benzenedithiolate)₂]₂

Abstract

IntroductionIn recent decades, researchers have attempted to construct and investigate new molecule-based magnetic materials; this has resulted in numerous new findings such as organic ferromagnets, [1] single-molecule magnets, [2] singlechain magnets, [3] magnetically controlled conductivities, [4] and chiral magnets.[5] However, although magnetic molecules can exhibit many of the aforementioned interesting properties, the application and investigation of these materials has been quite limited because of their weak intermolecular exchange interactions. For example, most of the molecule-based magnetic materials exhibit only weak intermolecular interactions |2J|/k B Ͻ 20 K; [6] k B is the Boltzmann constant, and J is defined in the following Hamiltonian [Equation (1)].(1)As the influence of intermolecular exchange interactions is far weaker than the influence of thermal fluctuations at room temperature, the interesting magnetic behavior can be observed only in the very low temperature region in many cases; therefore, the application of molecule-based magnetic [a]

Thiophene-Fused Nickel Dithiolenes: A Synthetic Scaffold for Highly Delocalized π-Electron Systems

“…Such ring fusion increases molecule planarity and enhances orbital overlap, thus maximizing electron delocalization into the organic ligands. Many fused-ring dithiolene systems have been studied, including the fusion of benzene, − functionalized benzene, − thiophene, ,,− pyridine, quinoxaline, , and other heterocyclic systems. − The incorporation of such fused-ring systems allows synthetic modification of the resulting materials via substituents and heteroatoms on the fused-ring units, allowing a great deal of diversity in the resulting dithiolene systems and the potential to finely tune both the electronic structures and solid-state arrangements. In addition, fused benzene analogues containing additional disulfide pairs have also allowed the generation of extended one- and two-dimensional dithiolene-based coordination polymers. , …”