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Phase Transitions and Water Dynamics of [Co(H2

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Phase Transitions and Water Dynamics of [Co(H

2

O)

6

](ClO

4

)

2

and [Mn(H

2

O)

6

](BF

4

)

2

Studied by Neutron Scattering Methods

E. Mikuli, A. Migdał-Mikuli, I. Natkaniec

a;b

, and B. Grad

Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Krak´ow, Poland

aFrank Laboratory of Neutron Physics, JINR, 141980 Dubna, Russia

bH. Niewodnicza´nski Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Krak´ow, Poland

Reprint requests to Dr. E. M.; Fax: (+4812) 634 05 15, E-mail: mikuli@chemia.uj.edu.pl Z. Naturforsch. 56 a, 244–248 (2001); received December 12, 2000

Inelastic incoherent neutron scattering (IINS) spectra and neutron powder diffraction (NPD) patterns, registered for [Co(H2O)6](ClO4)2at 18 - 270 K and for [Mn(H2O)6](BF4)2at 18 - 230 K, provided evidence that these crystals possess three solid phases in these ranges of temperatures.

In both compounds the phase transition occurring atTC3is connected with a change of the crystal structure, and that occurring atTC2with a change in the rate of the reorientational motions of H2O ligands.

Key words: Hexaaquacobalt(II) chlorate(VII) and Hexaaquamanganese(II) tetrafluoroborate;

Phase Transitions; Structural Changes; Water Reorientation; Neutron Scattering.

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