Gould R.F. (ed.)'s Adsorption From Aqueous Solution PDF

By Gould R.F. (ed.)

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The results were consistent with those obtained from a HF-EPR investigation. Particularly interesting about this EPR study was the finding that all the signals were split in two. This could be due to the presence of different local environments around the cluster within the crystal or the existence of intermolecular exchange. The latter suggestion was confirmed from the hysteresis loops of the complexes. The magnetisation versus field curves showed steps due to faster relaxation at certain fields caused by the presence of quantum tunnelling.

7 PovRay representation of [Mn12 O4 (OH)2 (O2 CPh)12 (thme)4 (py)2 ] (17). Hydrogen atoms are omitted for clarity. Code for atoms as in Fig. 4 species [Mn12 O4 (OH)2 (O2 CPh)12 (thme)4 (py)2 ] (17, [Mn12 thme], Fig. 7) [71]. This complex consists of a series of ten edge-sharing triangular units, as directed by the tripodal organic ligands, which combine to form a long, thin, rod-like complex. The presence of so many triangular units and thus the presence of many competing exchange interactions, results in an intermediate spin ground state for the complex of S = 7.

Brechin phase signals, but no peaks. No values for S and D have been reported thus far. Reaction between Mn(O2 CMe)2 · 4H2 O, H3 tea and NEt3 in MeCN results in the formation of the complex [Mn16 (O2 CMe)16 (teaH)12 ] (33, [Mn16 tea], Fig. 17) [75]. The structure comprises a loop of alternating Mn(III) and Mn(II) ions held together by teaH2– ligands, that describes a closed sinusoidal or saddle-like topology. 06 cm–1 . Given that ferromagnetic interactions between the metal centres would lead to a ground state of S = 36 and that antiferromagnetic interactions would give S = 0, this result is somewhat unusual.

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Adsorption From Aqueous Solution by Gould R.F. (ed.)


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