非表示:
キーワード:
bis(maleonitriledithiolato)nickelate (III) compound; tetramer spin cluster; magneto-structural phase transition
要旨:
[1-benzyl-4-aminopyridinium][bis(maleonitriledithiolato)nickelate]
contains [ni(mnt)(2)](2) (S= 1/2) tetramer units. It shows an unusual
transition to a nonmagnetic ground state associated with a structural
phase transition at T-c = 189 K. Based on the determination of the
single crystal structure and the analysis of the temperature dependence
of the magnetic susceptibility, we suggest the structural phase
transition significantly enhances the afm coupling within a tetramer
and thus drives the system towards a spin singlet ground state. (C)
2004 Elsevier B.V. All rights reserved.
