Accession Number : ADA253644


Title :   Strong Exchange Coupling Between the Lanthanide Ions and Phthalocyaniato Ligand Radical in Bis(phthalocyaninato)Lanthanide Sandwich Compounds


Descriptive Note : Technical rept.


Corporate Author : NORTH CAROLINA UNIV AT CHAPEL HILL DEPT OF CHEMISTRY


Personal Author(s) : Trojan, Kathleen L. ; Kendall, Jonathan L. ; Kepler, Keith ; Hatfield, William E.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA253644


Report Date : 06 JUL 1992


Pagination or Media Count : 36


Abstract : A series of lanthanide phthalocyanine sandwich compounds with the formula (Pc2-) LnIII (Pcl-) have been synthesized and characterized. To a first approximation, the lanthanide ions exist in their normal trivalent state, while one of the phthalocyanine ligands exists in the normal dianionic state and the other exists as a monoanionic phthalocyanine radical. It is obvious from the magnetic behavior of these compounds that there is a strong magnetic interaction between the lanthanide f-electrons and the phthalocyanine radical electron. Both antiferro- and ferromagnetic ground states have been observed in this series of compounds which depends on the symmetry and occupancy of the magnetic orbitals on the lanthanide ion. In some cases both the antiferro- and ferromagnetic states of a single system are observed in the temperature range studied. In these cases, the energy separation between states has been evaluated from the magnetic data.


Descriptors :   *COUPLING(INTERACTION) , *LIGANDS , *RARE EARTH ELEMENTS , *PHTHALOCYANINES , *EXCHANGE , IONS , TEMPERATURE , MAGNETIC PROPERTIES , FERROMAGNETISM , CHEMICAL RADICALS , ANIONS , BEHAVIOR , SEPARATION , SYMMETRY , INTERACTIONS , ENERGY , ELECTRONS


Subject Categories : INORGANIC CHEMISTRY
      PHYSICAL CHEMISTRY
      ELECTRICITY AND MAGNETISM


Distribution Statement : APPROVED FOR PUBLIC RELEASE