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Hexacyanometalate Molecular Chemistry: Heptanuclear Heterobimetallic Complexes; Control of the Ground Spin State

机译:六金属氰化物分子化学:七核异双金属配合物;控制自旋状态

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摘要

Following a bottom-up approach to nanomaterials, we present a rational synthetic route from hexacya-nometalates [M(CN)_6]~(3-) (M=Cr~III, Co~III) cores to well-defined heptanuclear complexes. By changing the nature of the metallic cations and using a localised orbital model it is p9ossible to control and to tune the ground state spin vaue. Thus, with M=Cr~III, d~3, S=3/2, three heptanuclear species ere built and characterised by mass spectrometry in solution, by single-crystal X-ray diffraction and by powder magnetic susceptibility measurements, [Cr~III(CN-M'L_n)_6]~(9+) (M'=Cu~II, Ni~II, L_n=polydentate ligand), showing spin nground states S_G=9/2 [Cu~II], with ferromagnetic interactions J_Cr,Cu=+45 cm~(-1), S_G=15/2 [Ni~II] and J_Cr,Ni=+17.3 cm~(-1), S_G=27/2 [Mn~II], with an antiferromagnetic interaction J_Cr,Mn=-9 cm~(-1), (interaction Hamiltonian H=-J_Cr,M [S_CrSIGMA_iS_M(i)], i=1-6). With M=Co~III, d~6, S=0, the heptanuclear analogues [Co~III(CN-M'L_n)_6]~(9+) (M'=Cu~II, Ni~II, Mn~II) were similarly synthesised and studied. They present a singlet ground state and allow us to evaluated the weak antiferromagnetic coupling constant between two next-nearest neighbours M'-Co-M'.
机译:遵循自下而上的纳米材料方法,我们提出了从六氰基非金属盐[M(CN)_6]〜(3-)(M = Cr〜III,Co〜III)核到定义明确的七核配合物的合理合成路线。通过改变金属阳离子的性质并使用局部轨道模型,可以控制和调整基态自旋值。因此,在M = Cr〜III,d〜3,S = 3/2的情况下,通过溶液中的质谱,单晶X射线衍射和粉末磁化率测量,建立并表征了三个庚核物种[Cr〜 III(CN-M'L_n)_6]〜(9+)(M'= Cu〜II,Ni〜II,L_n =多齿配体),显示自旋基态S_G = 9/2 [Cu〜II],具有铁磁性J_Cr,Cu = + 45 cm〜(-1),S_G = 15/2 [Ni〜II]和J_Cr,Ni = + 17.3 cm〜(-1),S_G = 27/2 [Mn〜II]反铁磁相互作用J_Cr,Mn = -9 cm〜(-1),(相互作用哈密顿量H = -J_Cr,M [S_CrSIGMA_iS_M(i),i = 1-6)。 M = Co〜III,d〜6,S = 0,七核类似物[Co〜III(CN-M'L_n)_6]〜(9+)(M'= Cu〜II,Ni〜II,Mn〜 II)被类似地合成和研究。它们呈现单重态基态,使我们能够评估两个最近邻M'-Co-M'之间的弱反铁磁耦合常数。

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