The first mixed spin cyano bridged tetranuclear ruthenium compound was synthesized and characterized by Fujian Institute of structure

Monomolecular compounds with electron transfer between metals The design, synthesis and performance study of these compounds are not only beneficial to reveal the nature of electron transfer phenomena widely existing in physical, chemical and biological systems, but also have potential applications in nano or molecular electronic devices such as molecular switches, molecular rectifiers, molecular wires and molecular logic gates With the support of the strategic leading science and technology program of the Chinese Academy of Sciences and the National Natural Science Foundation, Sheng Tianlu, researcher of the research group of Academician Wu Xintao of Fujian Institute of material structure and State Key Laboratory of structural chemistry of the Chinese Academy of Sciences, and other researchers, based on the research of cyano bridged mixed valence compounds and their metal metal metal charge transfer (MMCT), used mixed valence Binuclear Ruthenium cluster units（ Ru 2V (AP) 4 was used as the basic unit to synthesize and characterize the first mixed spin cyano bridged tetranuclear ruthenium compound [Ru 2 (AP) 4-cn-ru 2 (AP) 4] (BPH 4) Lin Chensheng, an associate researcher, explained the formation of the mixed spin state through theoretical calculation The results show that the spin state of the Ru 2 fragment connected with the carbon end of the cyano bridge is s = 1 / 2, while that of the Ru 2 fragment connected with the N end of the cyano bridge is s = 3 / 2 UV-Vis absorption spectrum analysis and TDDFT calculation show that there is an electron transfer from high spin cluster unit ru2v (AP) 4 (s = 3 / 2) to low spin cluster unit ru2v (AP) 4 (s = 1 / 2), which is the first report of MMCT between different spin metal cluster units with the same valence Relevant research results were published in the Journal of German Applied Chemistry (angelw Chem Int ed 2019, 58, 15344 – 15348) The first author of the paper was su Shaodong, a doctoral student under the guidance of Academician Wu Xintao and researcher Sheng Tianlu The results of this study not only provide a new strategy for the spin state control of Binuclear Ruthenium compounds, but also break people's understanding that MMCT usually can only occur between different valence states of metal clusters with the same valence state and different spin state, which provides a new way for people to understand the widespread phenomenon of electron transfer in nature and the reasonable design of molecular electronic devices.