On/off photoswitching in a cyanide-bridged {Fe2Co2} magnetic molecular square.

Abhishake Mondal (1) , Yanling Li (1) , Mannan Seuleiman (1) , Miguel Julve (2) , Loïc Toupet (3) , Marylise Buron-Le Cointe (3) , Rodrigue Lescouëzec (1)

1 IPCM - Institut Parisien de Chimie Moléculaire
2 ICMol - Instituto de Ciencia Molecular
3 IPR - Institut de Physique de Rennes

A repeatable bidirectional paramagnetic ↔ diamagnetic photomagnetic effect has been observed in the cyanide-bridged Fe-Co square complex {[Fe{B(pz)(4)}(CN)(3)](2)[Co(bik)(2)](2)}(ClO(4))(2)*3H(2)O [B(pz)(4) = tetrapyrazolylborate, bik = bis(1-methylimidazol-2-yl)ketone]. Magnetic measurements and low-temperature single-crystal X-ray diffraction experiments have shown that a complete electron transfer from the diamagnetic Fe(II)-Co(III) state to the paramagnetic Fe(III)-Co(II) metastable state is induced by 808 nm laser light irradiation, whereas the diamagnetic state is recovered in an almost quantitative yield under irradiation at 532 nm.

Mots clés: INDUCED ELECTRON-TRANSFER; PRUSSIAN BLUE ANALOGS; COBALT-IRON CYANIDE; ALKALI-METAL-ION; PHOTOINDUCED MAGNETIZATION; SOLID-STATE; CO; TRANSITIONS; RELAXATION

Domaines: Biochimie, Biologie Moléculaire

Abhishake Mondal, Yanling Li, Mannan Seuleiman, Miguel Julve, Loïc Toupet, et al.. On/off photoswitching in a cyanide-bridged {Fe2Co2} magnetic molecular square.. Journal of the American Chemical Society, 2013, 135 (5), pp.1653-6. ⟨10.1021/ja3087467⟩. ⟨hal-00815657⟩