• Fine tuning the electronic properties of [M(bpy)3]2+ complexes by chemical pressure (M = Fe2+, Ru2+, Co2+, bpy = 2,2'-bipyridine)
    A. Hauser, N. Amstutz, S. Delahaye, S. Schenker, A. Sadki, R. Sieber and M. Zerara
    in "Structure and Bonding" (ed. Th. SchŲnherr), Springer, Berlin, 106 (2003), p81
    unige:4029
  • Chemical pressure
    A. Hauser, N. Amstutz, S. Delahaye, A. Sadki, S. Schenker, R. Sieber and M. Zerara
    Chimia, 56 (12) (2002), p685-689
    DOI:10.2533/000942902777679858 | unige:3691 | Abstract | Article PDF
The physical and photophysical properties of three classic transition metal complexes, namely [Fe(bpy)3]2+, [Ru(bpy)3]2+, and [Co(bpy)3]2+, can be tuned by doping them into a variety of inert crystalline host lattices. The underlying guest-host interactions are discussed in terms of a chemical pressure.
Incorporation of [Co(bpy)3]2+ into the cavities of the three-dimensional oxalate network structure in [Co(bpy)3][LiCr(ox)3] produces chemical pressure that destabilises the normal high-spin ground state 4T1 to such an extent that the [Co(bpy)3]2+ complex becomes a spin-crossover complex. It shows a temperature-dependent equilibrium between the 2E low-spin and the 4T1 high-spin states.

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