Dinuclear lanthanide(III) complexes with large-bite Schiff bases derived from 2,6-diformyl-4-chlorophenol and hydrazides: Synthesis, structural characterization and spectroscopic studies

Tamboura, Farba Bouyagui; Diouf, Ousmane; Barry, Aliou Hamady; Gaye, Mohamed; Sall, Abdou Salam

doi:10.1016/j.poly.2012.06.025

Cited by 30 publications

(20 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the presence of a broad band extending from 3700 to 3250 cm −1 with two maxima at 3420 and 3265 cm −1 could mean that uncoordinated water molecules are present in the complex, as is evident from the TGA study. The water molecules may be hydrogen bonded with each other or with the oxygen of the nitrates . The Eu–L spectrum also exhibited nitrate absorption bands at 1495, 1322, 1295, 1021 and 818 cm −1 (Figure ).…”

Section: Resultssupporting

confidence: 84%

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

et al. 2017

View full text Add to dashboard Cite

A pyridine-diacylhydrazone Schiff base ligand, L = 2,6-bis [(3-methoxy benzylidene) hydrazinocarbonyl]pyridine was prepared and characterized by single crystal X-ray diffraction. homogeneous and heterogeneous catalysis. [16][17][18] Following our recently published work towards the complexation of lanthanide(III) nitrate salts with dimethyl pyridine-2,6-dicarboxylate, we were interested in the synthesis of a 2,6-bis [(3-methoxybenzylidene)hydrazine carbonyl]pyridine L ligand derived from dimethyl pyridine-2,6-dicarboxylate ligand. [19] In comparison with dimethyl pyridine-2,6-dicarboxylate ligand, the L ligand possesses more coordination sites that can bind and stabilize different lanthanide metal ions with high coordination numbers. Moreover it has flexible groups that can accommodate and protect lanthanide metal atoms from solvent molecules, which avoid non-radiative deactivation processes. [20] Moreover, L is efficient in the displacement of water molecules present in the coordination sphere of lanthanide ions that quenches the luminescence by absorption of the emitted radiation in the vibrational excitation processes via the vibrational levels of the O-H of water molecules. [21] This work reports the synthesis of the L ligand by a condensation reaction between 2-methoxybenzaldehyde and 2,6-bis(hydrazinocarbonyl)pyridine in ethanol and describes its crystal structure. Additionally the coordinating behavior of L with lanthanide metals (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Er) has been investigated by elemental analysis, conductivity measurements, spectral analysis (IR, NMR, UV-Vis and mass) and thermal studies.The antioxidant activity and photoluminescence properties of L and Ln-L have been investigated.

show abstract

Section: Resultssupporting

confidence: 84%

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The difference between ν 1 and ν 4 , 187 cm -1 , coincides with values reported for a bi-dentate coordination mode for NO 3 moiety [23]. The additional band observed at 1383 cm -1 is due to the non-coordinated NO 3 groups (D 3 h) which is in agreement with the conductivity results [23,38], Fig. 3.…”

Section: Infrared Spectroscopysupporting

confidence: 89%

“…The first two bands may be assigned as a spin-allowed, interaligand due to the π → π* transitions ( 1 GS  1 IL) { 1 GS = singlet ground state, 1 IL = singlet intraligand excited state} of the conjugated aromatic system. The other two bands at 279 and 329 nm may be attributed to the π → π* and n → π* transitions involving molecular orbital's of the HC=N and C=O groups, respectively [38]. The photoluminescence spectra of 1.0x10 -5 M LH 2 and Ln-LH 2 complexes have been measured in methanol and DMF solvents at room temperature.…”

Section: Electronic Absorption Spectroscopymentioning

confidence: 99%

Photophysical properties and computational study of newly synthesized lanthanide complexes with N-(2-carboxyphenyl)salicylideneimine Schiff base ligand

Taha

Hijazi

Ababneh

et al. 2017

Journal of Luminescence

View full text Add to dashboard Cite

“…A few years ago our research group initiated a project concerning rare earth metal chemistry 11 in a search for unusual molecular materials. 12 By use of an acyclic Schiff 's base in presence of acetate groups, it is possible to introduce two identical or different lanthanide ions and to study their physicochemical properties. 13,14 The flexibility and the multiple coordination site of the acyclic ligand provides several possible structure with lanthanide ions.…”

Section: Introductionmentioning

confidence: 99%

Lanthanide(III) complexes with tridentate Schiff base ligand, antioxidant activity and X-ray crystal structures of the Nd(III) and Sm(III) complexes

Gueye¹,

Dieng²,

Thiam³

et al. 2017

S.Afr.j.chem.

Self Cite

View full text Add to dashboard Cite

The tridentate N 4 -type Schiff base was synthesized from the condensation reaction of 2-hydrazinopyridine and pyridine-2-carbaldehyde. Neodymium and Samarium complexes were isolated when the corresponding nitrate salt was added to the solution of the ligand. The isolated compounds were characterized by elemental analyses, IR study, room temperature magnetic measurements and single X-ray crystal diffraction of the two crystals. Both complexes crystallize in the monoclinic system with space group P21/c. KEYWORDSLanthanide complexes, hydrazino, antioxidant activity, X-ray structure.

show abstract

Dinuclear lanthanide(III) complexes with large-bite Schiff bases derived from 2,6-diformyl-4-chlorophenol and hydrazides: Synthesis, structural characterization and spectroscopic studies

Cited by 30 publications

References 31 publications

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

Photophysical properties and computational study of newly synthesized lanthanide complexes with N-(2-carboxyphenyl)salicylideneimine Schiff base ligand

Lanthanide(III) complexes with tridentate Schiff base ligand, antioxidant activity and X-ray crystal structures of the Nd(III) and Sm(III) complexes

Contact Info

Product

Resources

About