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Thermal and Light‐Activated Spin Crossover in Iron(III) qnal Complexes
Author(s) -
Thammasangwan Warisa,
Harding Phimphaka,
Telfer Shane G.,
Alkaş Adil,
Phonsri Wasinee,
Murray Keith S.,
Clérac Rodolphe,
Rouzières Mathieu,
Chastanet Guillaume,
Harding David J.
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000115
Subject(s) - spin crossover , chemistry , spin states , ion , crystallography , excited state , supramolecular chemistry , inorganic chemistry , atomic physics , crystal structure , physics , organic chemistry
Three iron(III) complexes, [Fe(qnal) 2 ]Y {qnal = 1‐[(8‐quinolinylimino)methyl]‐2‐naphthalenolate; Y = NO 3 1 , BPh 4 · CH 2 Cl 2 2 , NCS 3 } have been prepared to explore anion effects in spin crossover systems. Structural studies on 2 reveal supramolecular chains formed by π–π and C–H ··· π interactions between the [Fe(qnal) 2 ] + cations. Magnetic susceptibility measurements show the onset of spin crossover in 1 above 200 K, while complete spin crossover is observed in 2 and 3 with T 1/2 = 285 and 340 K, respectively. Unusually, 2 also undergoes light‐induced excited spin state trapping (LIESST) at 980 nm with ca. 65 % efficiency and T (LIESST) = 25 K and reverse ‐LIESST at 660 nm with full reversibility over many cycles. The results highlight the important influence that the anion has on thermal and light‐activated spin crossover properties.