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Carbonato-bridged heteronuclear Ni2IILn2III (Ln=Tb, Dy, Ho, Er, Tm, Yb, Lu) complexes synthesized by fixation of atmospheric CO2 : structural and magnetic studies.
Autorzy
Rok wydania
2015
Czasopismo
Numer woluminu
85
Strony
697-704
DOI
10.1016/j.poly.2014.09.036
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
A series of carbonato-bridged heteronuclear Ni II 2 Ln III 2 complexes 2[(μ 4 -CO 3 ) 2 {NiLn(L)(MeOH)(CH 3 COO)} 2 ]·9H 2 O·8MeOH (Ln=Tb (1), Dy (2), Ho (3), Er, (4)), [(μ 4 -CO 3 ) 2 {NiLn(L)(MeOH)(CH 3 COO)} 2 ]·2H 2 O·4MeOH (Ln=Tm (5)) and [(μ 4 -CO 3 ) 2 {NiLn(L)(MeOH)(CH 3 COO)} 2 ]·4MeOH (Ln=Yb (6), Lu(7)) with N,N′-bis(5-bromo-3-methoxysalicylidene)propylene-1,3-diamine (L) are reported. The complexes were obtained by a one-pot reaction with spontaneous fixation of atmospheric CO 2 into the coordination species during crystallization process. In each complex the Ni II 2 Ln III 2 metal core has a similar topology. The hexadentate Schiff base ligands chelate the Ni(II) and Ln(III) ions forming two binuclear units, that are linked by two CO 3 2− ions giving a carbonato bridged (μ 4 -CO 3 ) 2 {Ni II Ln III } 2 structures. Ferromagnetic interactions between 3d–4f metal centers have been observed for compounds 1 and 2. In complexes 3–6 both the isotropic exchange as well as of thermal depopulation of m J sublevels and magnetic anisotropy are observed. In compound 7, due to the nonmagnetic nature of the ground state of Lu(III) ions, only a weak antiferromagnetic interaction between Ni(II) ions occurs.
Słowa kluczowe
3d-4fcomplexes, carbonate-bridge, tetranuclear compounds, Magnetic properties, Schiff base complex
Adres publiczny
http://dx.doi.org/10.1016/j.poly.2014.09.036
Strona internetowa wydawcy
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