The physico-chemical properties of 4-chlorophenoxyacetates of Mn(II), Co(II), Ni(II) and Cu(II)

Abstract

The complexes of 4-chlorophenoxyacetates of Mn(II), Co(II), Ni(II) and Cu(II) have been synthesized as polycrystalline 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: pink for Co(II), green for Ni(II), blue for Cu(II) and a pale pink for Mn(II) compounds. The carboxylate group binds as monodentate and bidentate ligands. On heating to 1173K in air the complexes decompose in several steps. At first, they dehydrate in one step to anhydrous salts, that next decompose to the oxides of respective metals. Their magnetic moments were determined in the range of 76-303K. The results reveal them to be high-spin complexes of weak ligand fields.

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.…”

XAFS studies of Cu(II) and Co(II) complexes with derivatives of cinnamic acid

“…The IR spectroscopy for the Cu(II) complex and for sodium salt of 4‐nitrocinnamic acid and spectroscopic criteria indicated that COO – group coordinates monodently to the metal cation. XAFS studies confirmed the coordination via COO – groups and specified that the polyhedron of Cu(II) exhibits a square‐planar geometry (CuO 4 ) with two carboxylate ligands coordinating in the monodentate mode and two aqua ligands (Fig.…”