Complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III)

Abstract

The complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) have been synthesized as polycrystalline hydrated solids, and characterized by elemental analysis, spectroscopy, magnetic studies and also by X-ray diffraction and thermogravimetric measurements. The analysed complexes have the following colours: violet for Nd(III), white for Gd(III) and cream for Ho(III) compounds. The carboxylate groups bind as bidentate chelating (Ho) or bridging ligands (Nd, Gd). On heating to 1173K in air the complexes decompose in several steps. At first, they dehydrate in one step to form anhydrous salts, that next decompose to the oxides of respective metals. The gaseous products of their thermal decomposition in nitrogen were also determined and the magnetic susceptibilites were measured over the temperature range of 76-303K and the magnetic moments were calculated. The results show that 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) are high-spin complexes with weak ligand fields. The solubility value in water at 293K for analysed 4-chlorophenoxyacetates is in the order of 10-4 mol/dm 3 .

Magnetic, thermal and spectroscopic properties of lanthanide(III) 2-(4-chlorophenoxy) acetates, Ln(C8H6ClO3)3•nH2O

“…4 The complexes of Nd(III), Gd(III) and Ho(III) ions with the 2-(4-chlorophenoxy)acetic acid anion are di-and trihydrates 14,15 and they exhibited properties similar to those of the complexes described in this paper. Therefore, the magnetic moment value of the Er(III) complex was equal to 7.01 (1.8 K) and 8.94 μ B (48 K).…”

“…1 They serve for the production of biomedical materials and as the therapeutic agents being used in anti-cancer therapy. 14,15 In previous papers, studies of the 2-(4-chlorophenoxy)acetic acid anion with Mo, Li, Cu, Mn, Co, Ni, Nd, Gd and Ho were reported in which the complexes were characterized by elemental analysis, FTIR spectroscopy, thermogravimetric studies and X-ray diffraction measurements. Having luminescence properties, their complexes with 4f electron elements find application in optical and electronic industries.…”

“…Carboxylic acids are applied for the absorption, preservation and separation of many gases. 14,15 In continuation of ongoing investigations on the carboxylates of transition metal ions, the synthesis of complexes of lanthanides(III) with the 2-(4-chlorophenoxy)acetic acid anion and an examination of some of their properties, such as thermal stability in air at 293−1273 K, magnetic properties in the range of 77−303 K and 1.8−300 K, and their FTIR spectra, are reported herein. 1,6 They play significant roles in crystal engineering and serve for the production of paramagnetic organic materials.…”

Spectral, XRD, morphological, DFT, and molecular modeling investigations of newly prepared isatin Schiff base complexes

“…The tetrahedral 3 T 1 (F)→ 3 A 2 transition was observed at Ni (II) complex solid reflectance spectrum at 14,285 cm −1 confirming the tetrahedral structure of the complex 33 . Cu (II) complex diffused reflectance spectrum displayed band at 16213 cm −1 which is assigned to 4 A 2 → 4 A 1 (P) transition of tetrahedral geometry 34 . The diffused reflectance spectrum showed band at 28,985 cm −1 which is assigned as n – π * transition and the bands at 30,303 and 37,037 cm −1 are assigned as π – π * transitions.…”