Synthesis and characterization of lanthanide(III) complexes with a mesogenic Schiff-base, N,N′-di-(4-decyloxysalicylidene)-2′,6′-diaminopyridine

Synthesis, structural characterization and photoluminescence properties of a novel La(III) complex

“…In the IR spectrum of the ligand and the complex, the azomethine m (CH@N) vibration was observed at 1623 and 1637 cm À1 , respectively. The shift of the azomethine m (CH@N) vibration to a higher wavenumber suggests the presence of the iminium zwitterionic form and non-involvement of imine nitrogen atom (C@N) in the complex formation [24]. In the IR spectrum of the complex, the broad bands at 3313 and 3082 cm À1 can be assigned to the m (OAH) and m (N-H) stretches respectively.…”

Investigations into Luminescent Properties of Sm(III), Eu(III), Tb(III) and Dy(III) Complexes of Some Schiff-base Ligands

“…were prepared by condensation of 4-decyloxysalicylaldehyde with different spacers such as 1,4-diaminobutane, 2,6-diaminopyridine and 1,3-diaminobenzene in absolute ethanol in presence of acetic acid as reported in our earlier work (Shakya et al 2012a(Shakya et al , 2012b(Shakya et al & 2014. Ln(NO 3 ) 3 .6H 2 O (Ln = Sm, Eu, Tb and Dy) were prepared by reactions of lanthanide oxide and nitric acid.…”

“…Several nitrogen-and oxygen-donor ligands have been utilized in the sensitization of lanthanide luminescence (Cui et al 2007;Zhou et al 2008). More recently, we performed a systematic study on lanthanide complexes consisting of the mesogenic Schiffbase ligands and we found an overall stoichiometry [Ln 2 (LH 2 ) 3 (NO 3 ) 4 ](NO 3 ) 2 for all the complexes (Shakya et al 2012a(Shakya et al , 2012b(Shakya et al , 2014. In continuation of our earlier work, a study on room temperature luminescent properties of the complexes of some Ln(III) ions (Ln = Sm, Eu, Tb and Dy) is reported in this paper.…”

“…xH 2 O (Ln = Sm, Eu, Tb and Dy) in THF solution to a stirred THF solution of the Schiff-base ligands viz., H 2 L 1 , H 2 L 2 and H 2 L 3 as reported in our earlier work (Shakya et al 2012a(Shakya et al , 2012b(Shakya et al & 2014. For instance, a solution of Sm(NO 3 ) 3 .6H 2 O (0.89 g, 2.0 mmol in 20 mL) in THF was added dropwise to a stirred THF solution of the ligand, H 2 L 1 (1.83 g, 3.0 mmol in 30 mL).…”

Synthesis and Structural Characterization of Some Lanthanide(III) Nitrate Complexes with a Mesogenic Schiff-Base, N,N’-di-4-(4’-heptadecyloxybenzoate) salicylidene-1,3-diaminopropane Derived from 2,4- dihydroxybenzaldehyde

“…This allows the preparation of a wide variety of liquid crystalline complexes, whose properties are strongly dependent on the ligand structure and the metal ion used [15]. As a part of our further investigation on systematic structural and spectroscopic studies of 3d and 4f metal complexes of a series of Schiff-bases [16][17][18][19][20], we now report here the synthesis and structural characterizations of some Ln III complexes with a Schiff-base, N,N'-di-4-(4-heptadecyloxybenzoate) salicylidene-1,3-diaminopropane derived from 2,4-dihydroxybenzaldehyde. Besides, the mesogenic properties of the synthesized ligand and Ln(III) complexes are also studied.…”