A Genuine Example of a Discrete Bimetallic (Cu, Gd) Complex:  Structural Determination and Magnetic Properties

Abstract

The LCuGd(NO3)3·Me2CO complex crystallizes in the monoclinic space group P21/c (No. 14) in a cell having the dimensions a = 9.799(1) Å, b = 18.926(3) Å, c = 16.012(1) Å, β = 96.530(8)°, Z = 4. The four units forming the unit cell do not display any obvious short contacts between them. The magnetic behavior is characteristic of a ferromagnetic interaction between the Gd3+ and Cu2+ ions.

A Crystallographic, EPR and DFT Investigations of a Novel Magnetically Silent Mono-atom Acetate-Bridged Binuclear Schiff Base-Copper(II) Complex

“…Bridging O2 and O2 i atoms simultaneously occupy both inplane and apical coordination sites of copper(II) nuclei within dimeric unit. The apical bond of bridging atom is as expected 0.49 Å longer (Cu1-O2i bond is 2.447 Å and Cu1-O2 bond is 1.960 Å) than the basal plane distance and is shorter than these in formerly studied five analogous structures [24,[25][26][27][28]. The other in-plane bond distances are quantitatively comparable with corresponding values.…”

“…In the most cases where tridentate N 2 O Schiff base ligands are incorporated, square-pyramidal one-atom bridged complexes of type b are mainly obtained [24][25][26][27][28][29][30] and in this array, Schiff base ligands resides in basal plane while one bridging atom occupies the axial position of one monomeric unit and the other locates in basal plane of the same unit. This type of dimers display weak exchange coupling, often antiferromagnetic, as expected since only one atom participates bridging mode.…”

“…In these complexes, the most common observed bridging modes are syn-syn, anti-anti, syn-anti and monoatomic bridges each demonstrating varying magnetic superexchange pathways [8,23]. On the other hand, the number of monoatomic acetate-bridged symmetric binuclear copper(II) complexes in the presence of ancillary ligands are still relatively limited and all of them studied so far were found to display weak ferro or antiferromagnetic coupling [24][25][26][27][28][29]. In case of the incorporation of co-ligands in order for the preparation of oneatom bridged binuclear complexes, the use of appropriate ones serving as complementary structural template is mandatory.…”

Isolated d–f pairs in supramolecular complexes with tunable structural and electronic properties †

“…3, 5 These pure heterodimetallic systems open new perspectives for (i) the exploration of interactions between f-and d-block ions possessing first-order orbital momenta, [5][6][7][8] (ii) the preparation of extended and organised heterotrimetallic d-fd 14 and f-d-f 15 architectures in the solid state and (iii) the detailed re-examination of the intimate mechanism proposed by Goodenough.…”

Synthesis and characterization of a novel Gd(III)–Cu(II) dinuclear adduct

“…[3] However, Costes et al have reported the synthesis of an antiferromagnetically coupled Gd(III)-Cu(II) dinuclear complex in which Gd(III) and Cu(II) are unsymmetrically bridged by a phenolate O and an oximato (N-O) group. [4] The reactions described in this work are part of an effort to expand the type of bridging ligand used to link Gd(III) and Cu (II). In previous work we demonstrated the effectiveness of Cu(2,2-oxomac) [5] and Cu(3,2-oxomac) [6] (see figure 1) as dinucleating ligands by the preparation of adducts between these complexes and M(hfa) 2 (M = Cu or Ni) in which two oxamide oxygen atoms on adjacent carbon atoms of the macrocycles serve as linkages between Cu(II) and M (II).…”