title: Homo dinuclear lanthanide(III) complexes of a mesogenic Schiff-base, N,N'-di-(4-decyloxysalicylidene)-1',6'-diaminohexane: synthesis and characterization.
abstract: A mesogenic Schiff-base, N,N'-di-(4-decyloxysalicylidene)-1',6'-diaminohexane, H2ddsdh (abbreviated as H2L2) that exhibits smectic-B (SmB) mesophase, was synthesized and its structure studied by elemental analysis, mass spectrometry, NMR & IR spectral techniques. The Schiff-base, H2L2, upon condensation with hydrated lanthanide(III) nitrates, yields LnIII complexes of the general composition [Ln2(L2H2)3(NO3)4](NO3)2, where Ln=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Ho. IR and NMR spectral data imply a bi-dentate bonding of the Schiff-base in its zwitterionic form (as L2H2) to the LnIII ions through two phenolate oxygens. The POM and DSC studies reveal that none of the LnIII complexes exhibits mesomorphism. Fluorescence studies show that the TbIII complex displays characteristic metal-centered fluorescence (solution state).
authors.affiliation: Department of Chemistry, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Pawan Raj
authors.initials: PR
authors.lastname: Shakya
authors.forename: Angad Kumar
authors.initials: AK
authors.lastname: Singh
authors.forename: T R
authors.initials: TR
authors.lastname: Rao
mesh_terms: D003959:Diamines / Q000737:chemistry*; D005453:Fluorescence; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D013058:Mass Spectrometry; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000737:chemistry; D013055:Spectrophotometry, Infrared
chemical_list: D003959:Diamines; D028581:Lanthanoid Series Elements; C568106:N,N'-di-(4-decyloxysalicylidene)-1',6'-diaminohexane; D009942:Organometallic Compounds; D012545:Schiff Bases