Metamagnetic behaviour in a new Cu(ii)Re(iv) chain based on the hexachlororhenate(iv) anion

Abstract

A new chloro-bridged heterobimetallic Cu(II)Re(IV) chain of formula {Cu(pyim)(Him)2ReCl6}n·MeCN (·MeCN) has been prepared and magnetostructurally characterised. Compound is the first example of the [Re(IV)Cl6](2-) anion acting as a metalloligand towards a paramagnetic metal ion.

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

“…As described above, the hexahalorhenates(IV) with heavier halides are also anisotropic ( Table 6). Although the Cl and Br analogues are efficient magnetic linkers with a 3d transition metal center [242,243], no examples are known for the iodide analogue. In the heterometallic chain 121, the F analogue forms a linear Re IV ••F•••M (M = 3d metal center) backbone, whereas the Cl (122; Fig.…”

Aquapentachlororhenate(iv): a singular and promising building block for metal assembly

“…Recently, the use of the [ReCl 6 ] 2anion as a metalloligand has led to the preparation and investigation of a new chloro-65 bridged heterobimetallic Cu II Re IV chain of formula {Cu(pyim)(Him) 2 ReCl 6 } n ·MeCN. 10 Once synthesised, 1 is air-stable over a period of several months. In order to study its stability further, electronic absorption spectra of 1 were collected both in solid state and in acetonitrile solution (see Fig.…”

“…2 Upon cooling, χ M T 5 for 1 remains practically constant until 100 K, then decreases at lower temperatures reaching a minimum value of 1.13 cm 3 mol -1 K at 2.0 K. No maximum of the susceptibility is observed in 1. The decrease of the χ M T values is likely due to the presence of intermolecular interactions and zero-field splitting (zfs) 10 effects which are significant in the Re IV ion. 2 The field dependence of the magnetisation (M) plot for 1 at 2.0 K is given in Figure S4, which exhibits continuous increase of M with the applied magnetic field.…”

“…The study of its magnetic properties reveal that 1 is a magnetically isolated Re IV complex with a significant value of the zero-field splitting [|D| = 6.1 cm -1 ]. In the crystal lattice, the PPh 4 + cations ensure the magnetic isolation and account for the lack of any significant through-space magnetic 10 coupling. 1 is also a stable, paramagnetic and highly anisotropic compound and, therefore, it could be used as starting material or building block in synthetic processes leading to new magnetic systems based on Re IV , as well as in computational studies dealing with theoretical models of 15 coordinated water on unstable systems.…”

Hexakis(diethylacetamide)iron(II) hexahalorhenate(IV) ionic salts: X-ray structures and magnetic properties

“…Magnetic systems based on hexahalorhenate(IV) salts, [ReX 6 ] 2À (X = F, Cl, Br and I), have been thoroughly investigated for decades in the field of molecule-based magnetism, the different magnetic properties they exhibit being at the origin of this interest [1][2][3][4][5][6][7][8].…”