Unprecedented interplay of antiferro- and ferromagnetic exchange interactions through intermolecular hydrogen bonds in mononuclear Cu(ii) complexes

Abstract

Copper(II) coordination compounds with the condensation product of the diacetylmonoxime and 2-hydrazino-4,6-dimethylpirimidine (H2L) with composition [Сu(Н2L)Br2]·Н2О (I) and [Сu(Н2L)Cl2] (II) were synthesized. Molecular structures of the compounds were established with...

Cu(ii)–Ln(iii) (Ln = Gd, Tb and Dy) complexes of an unsymmetrical N2O3 donor ligand: field induced SMM behaviour of Cu(ii)–Tb(iii) complexes

“…In earlier reports, it has been observed that the transition metal complexes, in particular Cu( ii ) complexes, show effective exchange interactions through intra- or intermolecular hydrogen bonding. 24 In complexes 2 and 3 , the coordinated water molecule forms a strong hydrogen bond with the O atoms coordinated to the Cu( ii ) ion. Therefore, we have considered two exchange interactions between Cu( ii ) and Ln( iii ) centers during the simulations as shown in Fig.…”

Two Discoveries in One Crystal: σ-Type Oxime Radical as an Unforeseen Building Block in Molecular Magnetics and Its Spatial Structure

“…63 However, it could not be ruled out that the values of J may also be effected by other factors since copper-nitroxide systems are characterized by the sensitivity of exchange interactions to geometry and the electronic structure. 67 To clarify the dissociation ability of complex 3 in solution, a reaction with pyrazolone 4 was carried out (Scheme 3). The choice of substrate is based on a previously known transformation.…”

“…As noted above, the difference in the sign of magnetic interactions correlates with the sign of the spin population on the coordinating oxygen atom; namely, the positive sign of the spin population leads to an antiferromagnetic exchange interaction, and the negative sign leads to a ferromagnetic one (McConnell I mechanism) . However, it could not be ruled out that the values of J may also be effected by other factors since copper-nitroxide systems are characterized by the sensitivity of exchange interactions to geometry and the electronic structure …”