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

doi:10.1039/b925482j

CORC > 北京大学 > 化学与分子工程学院

	Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere
	Zhang, Li ; Xu, Guan-Cheng ; Xu, Hong-Bin ; Mereacre, Valeriu ; Wang, Zhe-Ming ; Powell, Annie K. ; Gao, Song
刊名	dalton transactions
	2010
关键词	MOLECULAR-BASED MATERIALS PI-PI-INTERACTIONS LONG ALKYL CHAINS ROOM-TEMPERATURE SCHIFF-BASE INTERMOLECULAR INTERACTIONS THERMAL HYSTERESIS CRYSTAL-STRUCTURES BRIDGED DINUCLEAR WIDE HYSTERESIS
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.; Chemistry, Inorganic & Nuclear; SCI(E); EI; 15; ARTICLE; 20; 4856-4868; 39
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/151285]
专题	化学与分子工程学院
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.
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.
MLA	Zhang, Li,et al."Synthesis, magnetic and photomagnetic study of new iron(II) spin-crossover complexes with N4O2 coordination sphere".dalton transactions (2010).