Magnetische Untersuchungen an Komplexen von La(III), Pr(III) und Nd(III) mitSchiffschen Basen
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Magnetic studies on the schiff base complexes of La(III), Pr(III), and Nd(III)
Specific magnetic susceptibilities (χs) of several newly synthesized chelates of some of the lanthanons [La(III), Pr(III) and Nd(III)] are reported. These derivatives are of the general type,Ln(O-i-C3H7)3−n(C6H5CH∶NRO) n [where,Ln=La(III), Pr(III) or Nd(III);n=1 or 2 and R=CH2CH2, CH2CHCH3 or C6H4] and have been prepared by the reaction of the alkoxides of the lanthanons withSchiff bases such as benzylidene-2-hydroxyethylamine (C6H5CH∶NCH2CH2OH), benzylidene-2-hydroxy-n-propylamine (C6H5CH∶NCH2CHOHCH3) and benzylidene-o-aminophenol (C6H5CH∶NC6H4OH) in different molar relations in dry benzene.
The resulting crystalline derivatives are non-volatile, light to deep yellow or blackish in colour. These tend to polymerize on keeping as shown by their insoluble nature and higher melting points, the polymerisation possibly occurring by the intermolecular coordination through oxygen atoms as reported earlier1.
UsingGouy method2, the bis-isopropoxy mono-Schiff base and mono-isopropoxy bis-Schiff base complexes of La(III) have been shown to be diamagnetic, with χs values being in the range of −0.32 to −0.45×10−6 and −0.39 to −0.55×10−6 c.g.s. units at 305 K respectively.
In the remaining derivatives, Pr(O-i-C3H7)3−n(C6H5CH∶ NRO) n and Nd(O-i-C3H7)3−n(C6H5CH∶NRO) n (where,n=1 or 2 and R=CH2CH2, CH2CHCH3 or C6H4) the magnetic moment values range between 3.25 to 3.32 and 3.30 to 3.33 μB respectively indicating their paramagnetic nature.
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