• Crystalline, Mixed-Valence Manganese Analogue of Prussian Blue: Magnetic, Spectroscopic, X-ray and Neutron Diffraction Studies
    P. Franz, C. Ambrus, A. Hauser, D. Chernyshov, M. Hostettler, J. Hauser, L. Keller, K. Kršmer, H. Stoeckli-Evans, P. Pattison, H.-B. BŁrgi and S. Decurtins
    Journal of the American Chemical Society, 126 (50) (2004), p16472-16477
    DOI:10.1021/ja0465451 | unige:3247 | Abstract | Article HTML | Article PDF
The compound of stoichiometry Mn(II)3[Mn(III)(CN)6]2¬∑zH2O (z = 12‚ąí16) (1) forms air-stable, transparent red crystals. Low-temperature single crystal optical spectroscopy and single crystal X-ray diffraction provide compelling evidence for N-bonded high-spin manganese(II), and C-bonded low-spin manganese(III) ions arranged in a disordered, face-centered cubic lattice analogous to that of Prussian Blue. X-ray and neutron diffraction show structured diffuse scattering indicative of partially correlated (rather than random) substitutions of [Mn(III)(CN)6] ions by (H2O)6 clusters. Magnetic susceptibility measurements and elastic neutron scattering experiments indicate a ferrimagnetic structure below the critical temperature Tc = 35.5 K.
  • Ruthenium(II) complex of bis(2,2'-bipyridine)(6,7-dicyano-dipyrido[3,2-a:2',3'-c]phenazine): synthesis, structure, electrochemical and luminescence studies
    J. Rusanova, S. Decurtins, E. Rusanov, H. Stoeckli-Evans, S. Delahaye and A. Hauser
    Dalton Transactions, (23) (2002), p4318-4320
    DOI:10.1039/b210440g | unige:3700 | Abstract | Article HTML | Article PDF
A novel ruthenium complex with a 6,7-dicyanosubstituted dppz ligand has been synthesised: its crystal structure and physico-chemical studies are reported.
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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