Complexes of some 4f metal ions of the mesogenic Schiff-base, N,N′-di-(4-decyloxysalicylidene)-1′,3′-diaminobenzene: synthesis and spectral studies

A mesogenic Schiff-base, N,N′-di-(4-decyloxysalicylidene)-1′,3′-diaminobenzene, H 2 ddsdbz (abbreviated as H 2 L), that exhibits a nematic mesophase was synthesized and its structure was studied by elemental analysis, mass spectrometry, NMR, and IR spectral techniques. The Schiff-base, H 2 L, upon c...

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Bibliographic Details
Published in:Journal of coordination chemistry 2012-10, Vol.65 (20), p.3519-3529
Main Authors: Shakya, Pawan Raj, Singh, Angad Kumar, Rao, T.R.
Format: Article
Language:English
Subjects:
Complexes
III
Infrared radiation
Mesogenic Schiff-base
Mono-capped octahedron
NMR and IR Spectra
Studies
Zwitterionic-coordination
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Summary:A mesogenic Schiff-base, N,N′-di-(4-decyloxysalicylidene)-1′,3′-diaminobenzene, H 2 ddsdbz (abbreviated as H 2 L), that exhibits a nematic mesophase was synthesized and its structure was studied by elemental analysis, mass spectrometry, NMR, and IR spectral techniques. The Schiff-base, H 2 L, upon condensation with hydrated lanthanide(III) nitrates yields Ln III complexes, [Ln 2 (LH 2 ) 3 (NO 3 ) 4 ](NO 3 ) 2 , where Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, and Ho. Analyses of the IR and NMR spectral data imply bidentate Schiff-base through two phenolate oxygen atoms in its zwitterionic form to Ln III , rendering the overall geometry of the complexes as a seven-coordinate polyhedron - possibly distorted mono-capped octahedron. Polarizing optical microscope and differential scanning calorimetry studies reveal that despite H 2 L being mesogenic, none of the Ln III complexes synthesized under this study exhibits mesomorphism.
ISSN:0095-8972
1029-0389
DOI:10.1080/00958972.2012.719225