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Abstract:
Aryl substituted beta-alkenol
1-(dimethyl-1,3-thiazol-2-yl)-3,3,3-trifluoropropenol (DMTTFP) was
employed as an efficient metal chelator to obtain volatile monomeric
precursors containing Fe-II and Fe-III centers. [Fe(DMTTFP)(2)] (1) and
[Fe(DMTTFP)(2)(OBut)] (2) were synthesized by reacting suitable starting
materials with DMTTFP. The molecular structures were elucidated by
single-crystal X-ray diffraction analyses, which revealed a distorted
tetrahedral and a trigonal-bipyramidal arrangement of ligands around
iron atoms in 1 and 2, respectively. Magnetic investigations confirmed
[Fe(DMTTFP)(2)] to exhibit a thermally populated spin-state transition
that becomes apparent below 10 K. The high-spin state was gradually
transferred to a low-spin state on cooling, suggesting a nonmagnetic
ground state. [Fe(DMTTFP)(2)(OBut)] exhibited enhanced stability,
sufficient volatility, and decomposition behavior serving as an
efficient Fe-III precursor for the growth of iron oxide layers on an
Al2O3 substrate via chemical vapor deposition.
