Abstract
Physico-chemical properties of 3,4-dimethoxybenzoates of Co(II), Cu(II), La(III) and Nd(III) were studied. The complexes were obtained as hydrated or anhydrous polycrystalline solids with a metal ion-ligand mole ratio of 1 : 2 for divalent ions and of 1 : 3 in the case of trivalent cations. Their colours depend on the kind of central ion: pink for Co(II) complex, blue for Cu(II), white for La(III) and violet for Nd(III) complexes. The carboxylate groups in these compounds are monodentate, bidentate bridging or chelating and tridentate ligands. Their thermal decomposition was studied in the range of 293-1173 K. Hydrated complexes lose crystallization water molecules in one step and form anhydrous compounds, that next decompose to the oxides of respective metals. 3,4 - Dimethoxybenzoates of Co(II) is directly decomposed to the appropriate oxide and that of Nd(III) is also ultimately decomposed to its oxide but with the intemediate formation of Nd2O2CO3.. The magnetic moment values of 3,4-dimethoxybenzoates determined in the range of 76-303 K change from 4.22 µB to 4.61 µB for Co(II) complex , from 0.49 µB to 1.17 µB for Cu(II) complex , and from 2.69 µB to 3.15 µB for Nd(III) complex.
Highlights
3,4–Dimethoxybenzoic acid is a white solid sparingly soluble in cold water but very good soluble in the hot one
In Cu(II) and Co(II) compounds the d→d and in Nd(III) complex the f→f electron transitions of the central ions are those of the lowest energy and the absorption occurs at relatively high wavelengths that depends on the nature of the metal ion [11,17,18]
The bands with the maxima at 3450-3460 cm-1 in the spectra of 3,4-dimethoxybenzoates of Cu(II) and La(III) are characteristic for ν(OH) vibrations [20, 21] The bands of ν(C-C) ring vibrations appear at 1450-1500 cm-1 and 770-880 cm-1, and those corresponding to M-O stretching occur at 420-580 cm-1
Summary
3,4–Dimethoxybenzoic acid is a white solid sparingly soluble in cold water but very good soluble in the hot one. The physico-chemical properties of 3,4–dimethoxybenzoates of Co(II), Cu(II), La(III) and Nd(III) were determined by thermal stability in air atmosphere during heating to 1173 K , IR spectral data, X-ray powder investigations and magnetic properties. The magnetic properties of 3,4–dimethoxybenzoates of Co(II), Cu(II) and Nd(III) were investigated in the range of 76–303 K in order to study the kind of coordination of central ions and ligands.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
