Complexes of the selected transition metal ions with 4-methoxycinnamic acid

Synthesis, crystal structure, and magnetic properties of novel 2D kagome materials RE3Sb3Mg2O14 (RE = La, Pr, Sm, Eu, Tb, Ho): Comparison to RE3Sb3Zn2O14 family

“…In our previous paper on Eu 3 Sb 3 Zn 2 O 14 , we reported an effective moment of 3.52 µ B /Eu and a Weiss theta of −114.7 K from our high temperature Curie–Weiss fit . The moment obtained is close to the typically observed moment for Eu 3+ , from 3.40 to 3.51 µ B . However, expectations are that µ eff = 0 for Eu 3+ ‐containing compounds.…”

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

“…Moreover, the IR spectra analysis of the Co-mCA and the sodium salt of mCA indicates the bidendate nature of the carboxylate group. [25] It suggests that O atoms from the carboxylate groups of 4-methoxycinnamate anion form the bis-monodentate (η 2 -O) bridge that coordinates to Co cations forming two dimensional structures. The analogous coordination mode was found for the Co(II) complexes with unsubstituted and 3-fluoro-cinnamic acids.…”

“…The synthesis and characterization by elemental and thermal analyses, infrared (IR) spectroscopy and magnetic susceptibility measurements of Co‐mCA were presented in the previously published paper, whereas the synthesis of Cu‐nCA was carried out for the first time. Therefore, only the synthesis of the novel compound (Cu‐nCA) will be described here, together with the analytical methods used for identification and characterization of this complex.…”

Synthesis and some properties of light lanthanide complexes with 4,4′-bipyridine and dibromoacetates

“…On the other hand, in all the obtained complexes, the vibrations m as (COO) and m s (COO) are shifted to higher wave numbers corresponding to CHBr 2 COONa. According toManhas and Trikha [19] and[20], these bathochromic shifts are evidence leading to the interpretation that the carboxylate groups are bonded to metal(III) as bridging ligands. However, interpretation the nature of bonding lanthanide(III)-carboxylates is difficult.…”