Highly anisotropic exchange interactions in a trigonal bipyramidal cyanide-bridged Ni(II)3Os(III)2 cluster. Academic Article uri icon

abstract

  • This article is a part of our efforts to control the magnetic anisotropy in cyanide-based exchange-coupled systems with the eventual goal to obtain single-molecule magnets with higher blocking temperatures. We give the theoretical interpretation of the magnetic properties of the new pentanuclear complex {[Ni(II)(tmphen)(2)](3)[Os(III)(CN)(6)](2)} x 6 CH(3)CN (Ni(II)(3)Os(III)(2) cluster). Because the system contains the heavy Os(III) ions, spin-orbit coupling considerably exceeds the contributions from the low-symmetry crystal field and exchange coupling. The magnetic properties of the Ni(II)(3)Os(III)(2) cluster are described in the framework of a highly anisotropic pseudo-spin Hamiltonian that corresponds to the limit of strong spin-orbital coupling and takes into account the complex molecular structure. The model provides a good fit to the experimental data and allows the conclusion that the trigonal axis of the bipyramidal Ni(II)(3)Os(III)(2) cluster is a hard axis of magnetization. This explains the fact that in contrast with the isostructural trigonal bipyramidal Mn(III)(2)Mn(II)(3) cluster, the Ni(II)(3)Os(III)(2) system does not exhibit the single-molecule magnetic behavior.

published proceedings

  • J Phys Chem A

author list (cited authors)

  • Palii, A. V., Reu, O. S., Ostrovsky, S. M., Klokishner, S. I., Tsukerblat, B. S., Hilfiger, M., ... Dunbar, K. R.

citation count

  • 17

complete list of authors

  • Palii, Andrei V||Reu, Oleg S||Ostrovsky, Sergei M||Klokishner, Sophia I||Tsukerblat, Boris S||Hilfiger, Matthew||Shatruk, Michael||Prosvirin, Andrey||Dunbar, Kim R

publication date

  • June 2009