Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere

doi:10.1039/b925482j

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	Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere
	Zhang, Li 2,3; Xu, Guan-Cheng 2; Xu, Hong-Bin 2; Mereacre, Valeriu 1; Wang, Zhe-Ming 2; Powell, Annie K.1; Gao, Song 2
刊名	DALTON TRANSACTIONS
	2010
卷号	39 期号:20 页码:4856-4868
ISSN号	1477-9226
DOI	10.1039/b925482j
英文摘要	A 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.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000277689800027
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/70763]
专题	中国科学院化学研究所
通讯作者	Powell, Annie K.
作者单位	1.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
推荐引用方式 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.