An Fe(iii) wheel with a zwitterionic ligand: the structure and magnetic properties of [Fe(OMe)2(proline)]12[ClO4]12

Abstract

The structure and magnetic properties of a dodecanuclear iron(III) wheel are reported, featuring a bridging zwitterionic ligand.

Single crystal electron paramagnetic resonance spectra of CuII ions in Cu(tyrosine)2

“…The interactions between amino acids and different metallic ions produce a variety of structures which go from mononuclear to polynuclear systems being mononuclear species or one dimensional chains the most common structures in this type of compounds [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

“…The solid lines near to the positions of the crystal axes a and b in part (a) were obtained using Eqs (7). and(8), and give information about the exchange coupling.…”

A Molecular Pair of [GdNi3] Tetrahedra Bridged by Water Molecules

“…In this context, we and others have prepared aggregates involving a variety of different metals, such as Cu, Co, or Fe. [1][2][3][4] This chemistry is extensible to the lanthanides, [5] which have attracted interest for the production of cluster nanomagnets, [6][7][8] because they usually carry a large number of unpaired electrons and can exhibit significant anisotropy. In the case of Gd III ions, the absence of anisotropy is also very appealing, because a number of Gd III -3d molecules represent excellent magnetic coolers for low-tempera-ture applications.…”

Synthesis, Crystal Structure and Characterizations of a Novel 3D Coordinated Polymer [Gd2(tzda)3(H2O)5] n [H2tzda=(1,3,4‐Thiadiazole‐2,5‐diyldithio)diacetic Acid]

“…One of the trigonal faces is defined by two oxygen atoms from two tzda 22 ligands and one water oxygen atom (O4, O5, O13), the other one is defined by one oxygen atom from the other one tzda 22 ligand and two water oxygen atoms [O3A (2x þ 2, 2y þ 1, 2z þ 1), O15, O16]. Three oxygen 2.5896 (18) Symmetry transformations used to generate equivalent atoms: #1 2x þ 2, 2y þ 1, 2z þ 1; #2 2x þ 1, 2y, 2z þ 4; #3 x, y 2 1, z þ 2; #4 2x þ 1, 2y, 2z þ 3; #5 x, y þ 1, z 2 2. NOVEL 3D COORDINATED POLYMER atoms, O6, O14 and O4A, occupy the cap positions.…”