Spectral, Electrochemical, Fluorescence, Kinetic and Anti-microbial Studies of Acyclic Schiff-base Gadolinium(III) Complexes

Abstract

A new series of acyclic mononuclear gadolinium(III) complexes have been prepared by Schiff-base condensation derived from 5-methylsalicylaldehyde, diethylenetriamine, tris(2-aminoethyl) amine, triethylenetetramine, N,N-bis(3-aminopropyl)ethylene diamine, N,N-bis(aminopropyl) piperazine, and gadolinium nitrate. All the complexes were characterized by elemental and spectral analyses. Electronic spectra of the complexes show azomethine (CH=N) within the range of 410-420 nm. The fluorescence efficiency of Gd(III) ion in the cavity was completely quenched by the higher chain length ligands. Electrochemical studies of the complexes show irreversible one electron reduction process around −2.15 to −1.60 V The reduction potential of gadolinium(III) complexes shifts towards anodic directions respectively upon increasing the chain length. The catalytic activity of the gadolinium(III) complexes on the hydrolysis of 4-nitrophenylphosphate was determined. All gadolinium(III) complexes were screened for antibacterial activity.

Synthesis, growth and photoluminescence behaviour of Gd2O2SO4:Eu3+nanophosphors: the effect of temperature on the structural, morphological and optical properties

“…In addition, the elemental analysis was obtained by EDAX analysis, shown in Figure 3c, which clearly demonstrates a homogeneous distribution of gadolinium, carbon, oxygen, and sulphur elements. 27,28 The weaker absorption band located at 240 nm was due to the transition from the 2p orbitals of O 2to the 4f orbitals Gd 3+ ion, the band ascribed to the absorption of Gd 2 O 2 SO 4 host crystal. In agreement with the FE-SEM results, the average breadth in the middle part of needles was measured in the range of 50-55 nm.…”

Synthesis, spectral characterisation, electrochemical, and fluorescence studies of biologically active novel Schiff base complexes derived from E-4-(2-hydroxy-3-methoxybenzlideneamino)-N-(pyrimidin-2-yl)benzenesulfonamide

“…Generally the electrochemical properties of the complexes depend on a number of factors, such as chelate ring/size, axial ligation, degree and distribution of unsaturation, and substitution pattern in the chelate ring. 35 Each voltammogram shows one electron irreversible oxidation wave at a positive potential. The general reaction involved in the process is assigned to one electron oxidation of the metal centre except zinc.…”

Synthesis and characterization of chromium(III) Schiff base complexes: Antimicrobial activity and its electrocatalytic sensing ability of catechol

“…The spectral data has good agreement with the proposed molecular formula of the chromium complexes, and gives the more details about the intermediates and reaction products [29,30]. -4 (a): ESI-Mass spectrum of [CrL 3 (OH 2 ) 2 ] + complex.…”