Europium (III) complexes derived from carboxylic-substituted polychlorotriphenylmethyl radicals

Abstract:

Two europium (III) complexes (3 and 4) have been obtained reacting europium (III) nitrate and two polychlorotriphenylmethyl radicals properly functionalized with one (PTMMC^-, 1) and six (PTMHC^6-, 2) carboxylate groups, respectively. While complex 3 reveals a lamellar polar-apolar separated ion pair structure alternating PTM-based bilayers with nonaaquaeuropium cations ([Eu(H<inf>2</inf>O)<inf>9</inf>](PTMMC)<inf>3</inf>(PTMMCH)<inf>3</inf> · 7H<inf>2</inf>O · 6EtOH), complex 4 shows a one-dimensional chain-like structure with formula [Eu<inf>2</inf>(PTMHC)(H<inf>2</inf>O)<inf>13</inf>] · 16H<inf>2</inf>O · EtOH. Magnetic properties of both complexes were studied in the 2-300 K range, and show the presence of weak inter-radical antiferromagnetic interactions below 5 K. © 2007 Elsevier B.V. All rights reserved.

Año de publicación:

2007

Keywords:

• Europium (III)
• Separated ion pairs
• Molecular magnetism
• PTM radicals
• Carboxylates

Fuente:

scopus