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Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere
Zhang, Li2,3; Xu, Guan-Cheng2; Xu, Hong-Bin2; Mereacre, Valeriu1; Wang, Zhe-Ming2; Powell, Annie K.1; Gao, Song2
2010
Source PublicationDALTON TRANSACTIONS
ISSN1477-9226
Volume39Issue:20Pages:4856-4868
AbstractA new family of neutral mononuclear iron(II) spin crossover (SCO) compounds, Fe(L1-6)(2) (L1-6 = N'-((pyridin-2-yl)methylene)benzohydrazide (HL1), N'-(1-(pyridin-2-yl)ethylidene)-benzohydrazide (HL2), N'-(phenyl(pyridin-2-yl)methylene)benzohydrazide (HL3), 2-hydroxy-N'-((pyridin-2-yl)methylene)benzohydrazide (HL4), 2-hydroxy-N'-(1-(pyridin-2-yl)ethylidene)benzohydrazide (HL5), 2-hydroxy-N'-(phenyl(pyridin-2-yl)methylene)benzohydrazide (HL6)) with N4O2 donor sets have been synthesized from series tridentate Schiff base ligands with N,N,O donor sets. The investigation of magnetic properties of these compounds reveal that in the measured temperature range, compound 1 is in the high-spin (HS) state, and compound 3 and 6 are mainly in the low-spin (LS) state, whereas the other compounds exhibit various SCO properties: compound 2 undergoes a gradual incomplete SCO with characteristic temperature T-1/2 higher than 350 K; compound 4 exhibits a special stepwise thermally induced SCO occurring at similar to 150 K (smooth) and 200 K (two-steps, with T-S1 up arrow/down arrow = 204/202 K and T-S2 up arrow/down arrow = 227/219 K) with a mixture of the HS and LS states yielded below 100 K; compound 5 shows a gradual and complete LS <-> HS SCO with characteristic temperature T-1/2 = 273 K. All the three SCO compounds show the LIESST (light induced exited spin state trapping) effect with different levels of photoconversion. To thoroughly analyze these behaviours, Mossbauer spectra and DSC of 4 and 5, crystal structures of all the compounds at 290 K and 5 in the LS state at 110 K were carried out, which confirmed the structural changes accompanying the spin transition. In addition, alkyl substitution effect on the ligand field was suggested for this system.
DOI10.1039/b925482j
Indexed BySCI
Language英语
WOS IDWOS:000277689800027
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/70764
Collection中国科学院化学研究所
Corresponding AuthorPowell, Annie K.
Affiliation1.Univ Karlsruhe, Inst Anorgan Chem, Karlsruhe Inst Technol, D-76131 Karlsruhe, Germany
2.Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
3.Xinjiang Univ, Inst Appl Chem, Urumqi 830046, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Li,Xu, Guan-Cheng,Xu, Hong-Bin,et al. Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere[J]. DALTON TRANSACTIONS,2010,39(20):4856-4868.
APA Zhang, Li.,Xu, Guan-Cheng.,Xu, Hong-Bin.,Mereacre, Valeriu.,Wang, Zhe-Ming.,...&Gao, Song.(2010).Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere.DALTON TRANSACTIONS,39(20),4856-4868.
MLA Zhang, Li,et al."Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere".DALTON TRANSACTIONS 39.20(2010):4856-4868.
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