title: Effects of the host matrix on the 57Fe-species produced through EC-decay in 57Co-labelled tris(phenanthroline) cobalt (II) perchlorate.
abstract: Emission Mössbauer spectroscopic studies of 57Co-labelled [Co(phen)3]clO4)2 in host matrices [M(II)(phen)3](ClO4)2(M=Co, Fe, and Ni) indicate that the relative intensities of the anomalous species produced through the EC-decay depend on the kind of the host matrix. The largest intensity was observed with the cobalt (II) matrix, and the smallest with the iron (II) matrix. Emission spectra of 57Co-labelled [Co(2-CH3-phen)3](ClO4)2 2H2O in the matrix of [Fe(2-CH3-phen)3](ClO4)2 were also studied. The high-spin state (5T2) was predominantly observed at 4.2 K in the emission spectrum, while the low-spin state (1A1) was mainly observed in the absorption spectrum at 78 K. The results are discussed in terms of the stability of the lattice.
mesh_terms: D003037:Cobalt Radioisotopes; D007503:Iron Isotopes; D009686:Nuclear Physics; D010618:Phenanthrolines; D013052:Spectrometry, X-Ray Emission
chemical_list: D003037:Cobalt Radioisotopes; D007503:Iron Isotopes; D010618:Phenanthrolines