Spin-crossover and LIESST Effect for Iron(III) Complex Based on [pi]-[pi] Stacking by Coordination Programming

Spin-crossover (SCO) iron(III) compounds, [Fe(qnal-OMe)2]PF6·acetone (1) and [Fe(qnal-OMe)2]BPh4·2MeOH (2) (qnal-OMe: 7-methoxy-1-[(8-quinolinylimino)methyl]-2-naphthalenol), were prepared and characterized by X-ray single-crystal structure analysis, temperature-dependent magnetic susceptibility, an...

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Bibliographic Details
Published in:Chemistry letters 2014-07, Vol.43 (7), p.1058
Main Authors: Nakaya, Manabu, Shimayama, Kodai, Takami, Kohei, Hirata, Kazuya, Saliu Alao, Amolegbe, Nakamura, Masaaki, F. Lindoy, Leonard, Hayami, Shinya
Format: Article
Language:English
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Summary:Spin-crossover (SCO) iron(III) compounds, [Fe(qnal-OMe)2]PF6·acetone (1) and [Fe(qnal-OMe)2]BPh4·2MeOH (2) (qnal-OMe: 7-methoxy-1-[(8-quinolinylimino)methyl]-2-naphthalenol), were prepared and characterized by X-ray single-crystal structure analysis, temperature-dependent magnetic susceptibility, and Mössbauer spectroscopy measurements. The compounds exhibited SCO behavior with thermal hysteresis loop (T1/2[arrow up] = 202 K, T1/2[arrow down] = 194 K for 1 and T1/2[arrow up] = 304 K, T1/2[arrow down] = 194 K for 2). Moreover, the light-induced excited spin-state trapping (LIESST) effect was observed for the compounds when the samples were illuminated (1000 nm) at 5 K. We suggest that the introduction of a strong intermolecular interaction, such as π-π stacking, can play an important role in the observed dynamic phase transition.
ISSN:0366-7022
1348-0715