Preparation, structure and preliminary magnetic studies of an octanuclear alkoxo-bridged copper(II) cluster of the acetato-bridged dicubane type

Abstract

A novel double-cubane copper complex [ C U ~L ~( O ~C M ~) ~] [ C ~O ~] ~is prepared, and structurally and magnetically characterised (L = the monoanion of the hydrated, gem-diol form of di-2-pyridyl ketone).

Nonanuclear Coordination Compounds Featuring {M9L12}6+ Cores (M = NiII, CoII, or ZnII; L = 1,2,3‐Benzotriazolate)

“…The 4 T 1 (F) ground term for a high-spin Co II center implies a significant contribution of the orbital momentum. [19] The situation for the Ni II -based compound 1 is less complicated since the d 8 configuration results in an orbital singlet ground state (A 2 ). [19] The magnetic data for compounds 1 and 2 were analyzed using a complete basis set (full d manifolds, i.e.…”

“…Focusing our summary on coordination compounds of µ 3 -benzotriazolates with divalent metal ions, a range of pentanuclear metal complexes of the formula [M 5 (L) 4-x (OH) x (LЈ) 6 (H 2 O) 4x ] (where M = Cu, Ni, Zn; LЈ = bta or Me 2 bta; L = β-diketonate, x = 0, 1) were described in the literature. [6,9] Moreover, a mixedvalent pentanuclear copper [7] and a nonanuclear nickel [8] benzotriazolate complex have been reported. Magnetic susceptibility studies performed on both the pentanuclear copper and the nonanuclear nickel complexes show antiferromagnetic interactions.…”

“…Magnetic susceptibility studies performed on both the pentanuclear copper and the nonanuclear nickel complexes show antiferromagnetic interactions. [6][7][8] Most of these complexes are prepared in solution employing metal(II) β-diketonates as precursors, thus taking advantage of the proton transfer between metal(II) β-diketonates and benzotriazole ligands, which subsequently leads to partial replacement of β-diketonato ligands by deprotonated benzotriazoles. Recently, we reported T d -symmetrical pentanuclear metal complexes of the type [MЈZn 4 Cl 4 (L 6 )], [9] where MЈ = Zn or Co II , and L represents a 1,2,3-benzotriazolate ligand.…”

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic MnIII Clusters and their Magnetic Properties

“…[9] However, continual use of carboxylates will restrict the diversity of the products obtained and, as an alternative, we have begun to investigate the chemistry of MnF 3 with the proligand benzotriazole (btaH) and its derivatives. Benzotriazole has previously been used to produce model compounds for corrosion inhibition studies [10] and in M II cluster chemistry; [11] however, until recently, it has never been used in the synthesis of M III clusters. [12] Metal fluorides have been used to good effect in the synthesis of polymetallic chromium carboxylates [13] and, to a lesser extent, of Fe III clusters, including the synthesis of an open-shell Keggin iron ion, [14] but have thus far rarely been used in manganese cluster chemistry.…”

Tetrahedra, Super‐Tetrahedra, Bipyramids, Boxes and More: Polymetallic Clusters of Benzotriazole

“…Magnetic studies have shown that weak antiferromagnetic exchange between the metals leads to spin ground states equal to that of the "isolated" central M 2+ ion. Although a number of other Ni 2+ , [7] Cu 2+ , [8] Hg 2+ , [9] Re 5+ , [10] and Ag + [11] complexes have been reported, the chemistry of BtaH and its derivatives with M 3+ species has, until now, not been investigated.…”