Recent reviews. 57

Reviews are listed in order of appearance in the sources indicated. In multidisciplinary review journals, only those reviews which fall within the scope of this Journal are included. Sources are listed alphabetically in three categories: regularly issued review journals and series volumes, contributed volumes, and other monographs. Titles are numbered serially, and these numbers are used for reference in the index. Major English-language sources of critical reviews are covered. Encyclopedic treatises, annual surveys such as Specialist Periodical Reports, and compilations of symposia proceedings are omitted. This installment of Recent Reviews covers principally the early part of the 2000 literature. Previous installment: J. Org. Chem. 2000, 65(7), 2267-76. Supporting Information Available: A file containing this Recent Review compilation in Microsoft Word and the data in rtf format. This material is available free of charge via the Internet at http://pubs. acs.org.     

Half life of57Ni

The half life of⁵⁷Ni has been measured by Ge/Li/ -ray spectroscopy. The⁵⁷Ni radionuclide was created by bremsstrahlung impinging a sample of elemental Ni. Time change of the activity of the 1377.6-keV -ray following decay of⁵⁷Ni was analyzed to obtain a half life of 35.54±0.05 h for⁵⁷Ni.     

Temperature dependence of the mixed-valence state of57Fe-atoms produced in57Co-Labelled oxo-centered trinuclear iron acetate complexes

Emission Mössbauer spectra of mixedvalence trinuclear complexes,⁵⁷Co-labelled [CoFe₂O(CH₃CO₂)₆(H₂O)₃] and [CoFe₂O(CH₃CO₂)₆ (py)₃]py were compared with that of [CoCr₂O(CH₃CO₂)₆ (py)₃]py. It was found that the⁵⁷Fe atoms produced in⁵⁷Co-labelled [CoFe₂O(CH₃CO₂)₆(H₂O)₃] and [CoFe₂O(CH₃CO₂)₆ (py)₃]py showed a temperature-dependent mixed-valence state as observed in the absorption Mössbauer spectra of [Fe₃O(CH₃CO₂)₆ (H₂O)₃] and [Fe₃O(CH₃CO₂)₆ (py)₃]py, respectively, while⁵⁷Co-labelled [CoCr₂O(CH₃CO₂)₆ (py)₃]py showed a temperature-independent divalent iron/II/ state. The results indicate that the decayed atoms keep their position at the sites of original⁵⁷Co atoms and that the valence electrons are transferred through the intramolcular bondings.     

Emission Mössbauer spectroscopic studies on mixed-valence states of57Fe atoms produced in57Co-labeled trinuclear cobalt-iron carboxylates

Mixed-valence states of⁵⁷Fe-atoms produced after EC-decay of⁵⁷Co in oxo-centered trinuclear cobalt-iron carboxylates have been studied by means of emission Mössbauer spectroscopy. The emission Mössbauer spectra show nearly the same temperature dependence of the mixed-valence state as found in the absorption Mössbauer spectra of the corresponding trinuclear iron carboxylates. The results indicate that most of the decayed atoms keep their position at the sites of original⁵⁷Co atoms.