1206.3451 (A. X. Trautwein et al.)

Pressure-induced changes of the vibrational modes of spin-crossover
complexes studied by nuclear resonance scattering of synchrotron radiation    [PDF]

A. X. Trautwein, H. Paulsen, H. Winkler, H. Giefers, G. Wortmann, H. Toftlund, J. A. Wolny, A. I. Chumakov, O. Leupold

Nuclear inelastic scattering (NIS) spectra were recorded for the spin-crossover complexes STP and ETP (STP = [Fe(1,1,1-trisf[N-(2-pyridylmethyl)-N-methylamino]methylg- ethane)](ClO4)2 and ETP = [Fe(1,1,1-trisf[N-(2-pyridylmethyl)-N-methylamino]methylg-butane)](ClO4)2) at 30 K and at room temperature and also at ambient pressure and applied pressure (up to 2.6 GPa). Spin transition from the high-spin (HS) to the low-spin (LS) state was observed by lowering temperature and also by applying pressure at room temperature and has been assigned to the hardening of iron-bond stretching modes due to the smaller volume in the LS isomer.

View original: http://arxiv.org/abs/1206.3451