Abstract
The crystal structures of oxo-centered trinuclear cobalt-iron chloroacetate complex [Co II Fe 2 III O(CH 2 ClCO 2 ) 6 (H 2 O) 3 ].3H 2 O (1) was compared with that of previously reported trinuclear iron complex [Fe II Fe 2 III O(CH 2 ClCO 2 ) 6 (H 2 O) 3 ].3H 2 O (2) which as an isomorphous structure to 1. Compound 1 crystallizes in space group P2 1 /n with Z=4 in a unit cell of a=14.826 (4) A, b=4.536 (8) A, c=14.000 (4) A, β=100.32 (2) . and V=2968 (11) A 3 . The structure was refined to R=0.75 and R w =0.82. The coordination geometries of the three iron atoms are observed equivalent in 1 indicating a static disorder of the position among cobalt and iron atoms. Two distinct Fe III doublets observed in Mossbauer spectra of 1 become an indistinguishable broad doublet by dehydration of crystal water. On the other hand, no significant line-broadening is observed after the dehydration in complex 2. The results indicate that the dehydration in 2 induces a local environmental change reordering of an electronic configuration around iron atoms, whereas the remaining disordering is reflected in Mossbauer spectrum after the dehydration in 1
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