Front Cover: Water‐Solvation‐Dependent Spin Transitions in Cobalt(II)‐Octacyanidometallate Complexes (Eur. J. Inorg. Chem. 30/2023)

• Published in: European journal of inorganic chemistry Vol. 26; no. 30
• Main Authors: Song, Qinyu, Stefanczyk, Olaf, Li, Guanping, Kumar, Kunal, Nakamura, Kazuki, Nakabayashi, Koji, Ohkoshi, Shin‐ichi
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 24.10.2023
• Subjects: Charge transfer; Humidity; Inorganic chemistry; Solvation; Spin transition
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.202300482

The Front Cover shows the structural unit of the newly discovered [Co(terpy)2]3[W(CN)8]2⋅12H2O compound, terpy=2,2′:6′,2′′‐terpyridine. This material can adopt diverse states: low‐spin CoII and WV, S=1/2; high‐spin CoII, S=3/2; and low‐spin CoIII and WIV, S=0 (blue, purple, red, light blue, and pink polyhedra), depending on the treatment history of the sample. The fresh complex at 10 K has low‐spin CoII and WV centers. Above 300 K, the material demonstrates thermal desolvation‐assisted spin‐crossover (DASCO), reaching complete high‐spin CoII and WV states at 400 K. Next, Co3W2, upon cooling, exhibits SCO on CoII. Interestingly, a humidity treatment of Co3W2 initiates a new effect of isothermal humidity‐activated charge‐transfer‐induced spin transition (HACTIST) leading to the partial conversion of CoII…WV to CoIII…WIV pairs, which can be reversed by desolvation. More information can be found in the Research Article by O. Stefanczyk, S.‐i. Ohkoshi and co‐workers.