期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 36, 页码 15741-15749出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202007327
关键词
cyanide; framework; iron; rhenium; spin crossover
资金
- National Science Centre, Poland within the OPUS-14 project [2017/27/B/ST5/00947]
- Polish Ministry of Science and Higher Education [DI2018 018148]
A two-step hysteretic Fe(II)spin crossover (SCO) effect was achieved in programmed layered Cs{[Fe(3-CNpy)(2)][Re(CN)(8)]}.H2O (1) (3-CNpy=3-cyanopyridine) assembly consisting of cyanido-bridged Fe-II-Re(V)square grid sheets bonded by Cs(+)ions. The presence of two non-equivalent Fe(II)sites and the conjunction of 2D bimetallic coordination network with non-covalent interlayer interactions involving Cs+, [Re-V(CN)(8)](3-)ions, and 3-CNpy ligands, leads to the occurrence of two steps of thermal SCO with strong cooperativity giving a double thermal hysteresis loop. The resulting spin-transition phenomenon could be tuned by an external pressure giving the room-temperature range of SCO, as well as by visible-light irradiation, inducing an efficient recovery of the high-spin Fe(II)state at low temperatures. We prove that octacyanidorhenate(V) ion is an outstanding metalloligand for induction of a cooperative multistep, multiswitchable (FeSCO)-S-II effect.
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