Solvothermal synthesis of enneanuclear [CuII7LnIII2] clusters

Abstract

Employment of H3L (= 2-(β-naphthalideneamino)-2-hydroxymethyl-1-propanol) in mixed-metal copper-lanthanide cluster chemistry has led to the isolation of four new enneanuclear heteronuclear isostructural [Cu₇(II)Ln₂(III)] complexes. More specifically, the solvothermal reaction of Cu2(OAc)4·2H2O with H3L and the corresponding lanthanide nitrate salt in MeCN in the presence of a base, NEt3, yielded three complexes with the general formula [Cu₇(II)Ln₂(III)(L)4(HL)2(OAc)4]·2MeCN (Ln: Gd, 1·2MeCN; Tb, 2·2MeCN; Dy, 3·2MeCN), while in addition the Y(III) analogue, [Cu₇(II)Y₂(III)(L)4(HL)2(OAc)4]·2MeCN (4·2MeCN), was also synthesized in the same manner. The structure of the cluster describes two corner-sharing [Cu3Ln] cubane metallic units, each one further connected to one Cu(II) ion. Dc magnetic susceptibility studies in the 5-300 K range for complexes 1-4 reveal the presence of both ferromagnetic and antiferromagnetic exchange interactions within the metallic clusters.

1,2,4-Diazaphospholide complexes of lanthanum(iii), cerium(iii), neodymium(iii), praseodymium(iii), and samarium(iii): synthesis, X-ray structural characterization, and magnetic susceptibility studies

“…: 238-240 °C. 1 H NMR (600 MHz, DMSO-d 6 , 23 °C): δ = 3.61 (m, 16 H, CH 2 O for THF), 1.77 (m, 16 H, CH 2 for THF; it contains two additional tetrahydrofuran molecules in the lattice, which cannot be removed under high vacuum), 1.28-1.24 (br., δ 1/2 = 0.049 ppm, 54 H, CH 3 for tBu) ppm; 13 15,H 8.50,N 8.24;Found: C 53.94,H 8.32,N,8.05. 5: light-green crystals (0.52 g, 59% : C 53.93,H 8.46,N 8.20;Found: C 53.71,H 8.27,N,8.01.…”

Hydroxido supported and differently networked octanuclear Ni6Ln2 [Ln = GdIII and DyIII] complexes: structural variation, magnetic properties and theoretical insights

“…Weak exchange (𝐽 1 ) interactions are commonly observed in large Ni II -Gd III complexes and the magnitude of the Ni II -Gd III exchange interactions in 1 agree with those found previously in the literature. [62][63][64][65] Fig. 8 Left: The in-phase (') and out-of-phase (″) susceptibility data for complex 2 in a 600 Oe dc applied field.…”

Dinuclear complexes of europium(III) and gadolinium(III) ions with a julolidine–quinoline-based tridentate ligand

“…However, current understanding of similar systems with lanthanide metal ions is underdeveloped with most work completed only in recent decades [1,2]. Yet these systems have been found to exhibit unique properties suited for applications in magnetic, optical, luminescent, and electrochemical fields [3][4][5][6][7][8][9][10].…”