Octacyanidotungstate(IV) Coordination Chains Demonstrate a Light‐Induced Excited Spin State Trapping Behavior and Magnetic Exchange Photoswitching

• Published in: Angewandte Chemie International Edition Vol. 56; no. 43; pp. 13283 - 13287
• Main Authors: Magott, Michał, Stefańczyk, Olaf, Sieklucka, Barbara, Pinkowicz, Dawid
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 16-10-2017
• Edition: International ed. in English
• Subjects: Chains; Irradiation; LIESST; molecular magnets; octacyanidometalates; photomagnetism; photoswitching; Radiation; Trapping; octacyanidometalates; LIESST; molecular magnets; photomagnetism; photoswitching
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201703934

A huge increase in the magnetization of two coordination chains based on tetravalent octacyanidometalates (WIV and MoIV) is observed on irradiation with 436 nm light, while no such behavior is observed for the NbIV analogue. A photomagnetic response based solely on [WIV(CN)8]4− is demonstrated for the first time. The observed behavior is attributed to the light‐induced excited spin state trapping (LIESST) effect at the octacyanidometalate, and to the resulting magnetic exchange ON/OFF photoswitching between the MnII center and the photoinduced high‐spin (S=1) WIV or MoIV centers.
Let it shine! Octacyanidotungstate(IV) demonstrates a light‐induced excited spin state trapping photomagnetic effect that can be used to produce very strong magnetic exchange photoswitching functionality in various bimetallic coordination polymers.