Light-Induced Bidirectional Metal-to-Metal Charge Transfer in a Linear Fe Co Complex.

It is a challenge to reversibly switch both magnetism and polarity using light irradiation. Herein we report a linear Fe Co complex, whereby interconversion between Fe (μ-CN)Co (μ-NC)Fe (LS=low-spin, HS=high-spin) and Fe (μ-CN)Co (μ-NC)Fe linkages could be achieved upon heating and cooling, or alternating laser irradiation at 808 and 532 nm. The electron spin arrangement and charge distribution were simultaneously tuned accompanying bidirectional metal-to-metal charge transfer, providing switchable polarity and magnetism in the complex.

Magnetic fluorescent bifunctional spin-crossover complexes.

The rational design of magnetic and fluorescent bifunctional materials is attracting increasing interest. In this study, two mononuclear Fe(ii) complexes, namely [Fe(L)(NCS)] (1) and [Fe(L)(NCSe)] (2) are synthesised by combining a spin-crossover unit and a fluorescent ligand (naphth-1-yl)-N-(3,5-di(pyridin-2-yl)-4H-1,2,4-triazol-4-yl)methanimine (L) to achieve bifunctionality. Single-crystal X-ray studies and magnetic measurements confirm the presence of spin crossover behaviours; these measurements agree with the results of the temperature depended Raman spectra and infrared spectra.