Synthesis and Spectral Studies of Some Rare Earth Metal Complexes of the Mesogenic Schiff-Base, N,N’-di-(4’-octadecyloxybenzoate)salicylidene diaminoethane (Part-I)
World Journal of Surgical Research 2014, 3:3
Mesogenic Schiff-base, N,N’-di-(4’-octadecyloxybenzoate) salicylidenediaminoethane, H2dodbsde (abbreviated as H2L4), that exhibits smacticmesophase was synthesized and its structure studied by elemental analysis, mass spectrometry, NMR & IR spectral techniques. The Schiff-base, H2L4, upon condensation with hydrated lanthanide(III) nitrates, yields LnIIIcomplexes of the general composition,[Ln(L4H2)3NO3](NO3)2, where Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Ho. Analysis of the IR and NMR spectral data imply a bi-dentate bonding of the Schiff-base through two phenolateoxygens in its zwitterionic form to the LnIIIions, rendering the overall geometry of the complexes to eight-coordinated polyhedron - possibly distorted square antiprism. The POM and DSC studies reveal that among all the metalcomplexes of lanthanide ions only that of LaIIIcomplexis found to be mesogenic (nematic).
Mesogenic Schiff-base; LnIII complexes; Zwitterionic-coordination;distorted square antiprism; NMR & IR spectra