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V(IV)OLn(III) complexes (Ln  La, Eu or Gd) of the compartmental ligand N,N′-bis(3-hydroxysalicylidene)ethylenediamine

1996; Elsevier BV; Volume: 238; Issue: 1-2 Linguagem: Inglês

10.1016/0925-8388(96)02226-8

1873-4669

Masatomi Sakamoto, Takashi Ishikawa, Yuzo Nishida, Yoshihiko Sadaoka, Akira Matsumoto, Yutaka Fukuda, Masahiro Sakai, Masaaki Ohba, Hiroshi Sakiyama, Hisashi Ōkawa,

Magnetism in coordination complexes

Mononuclear oxovanadium(IV) complex VO(H2dhbaen) and heteronuclear oxovanadium(IV)-lanthanide(III) complexes VOLn(dhbaen)(NO3)(H2O)2.5 were synthesized, where H4dhbaen denotes N,N′-bis(3-hydroxysalicylidene)ethylenediamine. IR spectra showed that V(IV)O and Ln(III) ions are located at the endogenous N2O2- and the exogeneous O4-coordination sites of the ligand respectively. Based on circular dichroism (CD) spectra, it was suggested that amino alcohols are specifically bound at the VO-Ln heterometal center, through the nitrogen to the VO-site and through the oxygen to the Ln-site. Magnetic susceptibility measurements in the range 4.2 to 260 K revealed that the magnetic interaction between V(IV)O and Gd(III) ions is almost negligible. The fluorescence intensity of mononuclear Eu(III) complex markedly decreased on forming the heteronuclear V(IV)OEu(III) complex.