New types of heterospin complexes from trans-oxamido-bridged copper(II) binuclear units and nitronyl nitroxide radicals: Crystal structure and magnetic characterization

doi:10.1021/ic049247d

CORC > 化学研究所 > 中国科学院化学研究所

	New types of heterospin complexes from trans-oxamido-bridged copper(II) binuclear units and nitronyl nitroxide radicals: Crystal structure and magnetic characterization
	Liu, ZL ; Lu, ZL ; Zhang, DQ ; Jiang, ZH ; Li, LC ; Liu, CM ; Zhu, DB
刊名	INORGANIC CHEMISTRY
	2004-10-18
卷号	43 期号:21 页码:6620-6627
ISSN号	0020-1669
DOI	10.1021/ic049247d
英文摘要	Three new heterospin complexes derived from trans-oxamido-bridged copper(II) binuclear units [Cu-2(oxen), oxen = N,N-bis(2-aminoethyl)oxamide] and pyridine-substituted nitronyl nitroxides (o-, m-, and p-PYNN) were synthesized and characterized structurally and magnetically. Complexes 1 and 2 are four-spin complexes. Interestingly, it is found that in complex 3, the Cu(II) ions and m-PYNN units are arranged to form 1D double-stranded helical chains, which to the best of our knowledge is the first example of a metal nitronyl nitroxide complex with such a 1D helical structure. The temperature dependencies of the magnetic susceptibilities of 1 and 2 were fitted to the four-spin model with the Hamiltonian H = -2JS(Cu1)S(Cu2) - 2j(SCu1Srad1 - S-Cu2 S-rad2), leading to J = -150.5 cm(-1) and j = 47.2 cm(-1) for complex 1 and J = -191.7 cm(-1) and j = -18.9 cm(-1) for complex 2. The temperature dependence of the magnetic susceptibility of complex 3 was approximately simulated with a simple model composed of a dimer of Cu(II) ions and two m-PYNN molecules. The best fitting leads to the values of J = -183.0 cm(-1) and zJ' = -0.55 cm(-1) for the magnetic exchange of two Cu(II) ions through the oxamide bridge and that between the dimer of Cu(II) ions and two m-PYNN molecules, respectively. The antiferromagnetic exchange of oxamido-bridged Cu(II) ions in complexes 1-3 is strong. The strength of such antiferromagnetic interactions is also similar for the three complexes.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000224489100023
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/55077]
专题	中国科学院化学研究所
通讯作者	Zhang, DQ
作者单位	1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Organ SOlids Lab, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China 3.Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
推荐引用方式 GB/T 7714	Liu, ZL,Lu, ZL,Zhang, DQ,et al. New types of heterospin complexes from trans-oxamido-bridged copper(II) binuclear units and nitronyl nitroxide radicals: Crystal structure and magnetic characterization[J]. INORGANIC CHEMISTRY,2004,43(21):6620-6627.
APA	Liu, ZL.,Lu, ZL.,Zhang, DQ.,Jiang, ZH.,Li, LC.,...&Zhu, DB.(2004).New types of heterospin complexes from trans-oxamido-bridged copper(II) binuclear units and nitronyl nitroxide radicals: Crystal structure and magnetic characterization.INORGANIC CHEMISTRY,43(21),6620-6627.
MLA	Liu, ZL,et al."New types of heterospin complexes from trans-oxamido-bridged copper(II) binuclear units and nitronyl nitroxide radicals: Crystal structure and magnetic characterization".INORGANIC CHEMISTRY 43.21(2004):6620-6627.