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The Re^IV–Mo^VI compound of formula (PPh₄)₂ [ReCl₄ (µ-ox)MoO₂Cl₂] constitutes the first example of a heterodinuclear oxalato-bridged complex in the coordination chemistry of molybdenum. This compound is also the first polynuclear Re(IV) complex incorporating a 4d ion and it opens a new route toward other mixed 4d–5d polynuclear species. (for more details, see: José Martínez-Lillo, Donatella Armentano, Giovanni De Munno, Francesc Lloret, Miguel Julve and Juan Faus. Dalton Trans., 2011, 40, 4818–4820).

The [Cr(mal)2(OH)]24-building-block has been used to synthesize molecule-based polynuclear heterometallic magnets. (for more details, see: Fernando S. Delgado, Joaquín Sanchiz, Trinidad López, Francesc Lloret, Miguel Julve and Catalina Ruiz-Pérez CrystEngComm, 2010, 12, 2711-2721).

Zero- (duplex), one- (meso-helix), or two-dimensional (brick-wall sheet) hydrogen-bonded supramolecular aggregates of N,N'-1,n-phenylenebis(oxamic acid ethyl ester) molecules occur in the solid state depending on the substitution pattern of the phenylene spacer (n = 2–4) (for more details, see the full paper by M. C. Muñoz et al. in Crystengcomm. 2010, 12, 2473-2484).

A new metallosupramolecular functional complex with a meso-helical structure has been prepared through the side-by-side self-assembly of two linear heterotopic oligo-m-phenyleneoxalamide ligands by four CuII ions, which possesses unique redox and ferromagnetic properties (for more details, see the VIP full paper by E. Pardo et al. in Chem. Eur. J. 2010, 16, 12838-12851).

New homo- and heterometallic octanuclear complexes possessing a unique double-star architecture and interesting magnetic properties have been obtained through a molecular-programmed self-assembly process from dicopper(II) and dinickel(II) triple meso-helicate-type metallacryptands with meta-phenylene-substituted dioxamate ligands (for more details, see the full paper by E. Pardo et al. in Dalton Trans. 2010, 39, 4786-4801).

Two benzene-1,3,5-tris(oxamate) (L) bridging ligands self-assemble side-by-side with three square-planar CuII ions to give the anionic trinuclear copper(II) complex [CuII3L2]6– possessing a rare triangular cage-like structure of the [3.3.3](1,3,5)cyclophane-type. The three CuII ions within the tricopper(II) metallacyclophane unit are ferromagnetically coupled because of the spin polarization effects through the 1,3,5-substituted benzene spacers (for more details, see the full paper by M.-C. Dul et al. in Inorg. Chem. 2009, 48, 5244-5249).

The rational preparation of both homo- and heterometallic, tetranuclear Cu2M2 racks (M = CuII and NiII) is based on the heteropolytopic nature of the linear, tetranucleating phenylenedioxamato bridging ligands (L) and the presence of different aliphatic bi- and tridentate polyamines as terminal ligands (L’) (for more details, see the full paper by E. Pardo et al. in Inorg. Chem. 2009, 48, 4661-4673).

The zelf-assembly of an enantiomerically pure, chiral dianionic oxamatocopper(II) complex with cobalt(II) ions leads to neutral oxamato-bridged heterobimetallic chains that combine chirality and slow relaxation of the magnetisation phenomena, providing thus the first example of 'Chiral Single-Chain Magnets' (CSCMs).

A new trinuclear oxalamide cobalt triple mesocate presents two redox states (ON/OFF) with dramatically different magnetic properties; the two terminal high-spin (HS) d7 CoII ions (S = 3/2) which are ferromagnetically coupled in the homovalent tricobalt(II) reduced state (2) become uncoupled in the heterovalent tricobalt(II,III,II) oxidized state (2ox) upon one-electron oxidation of the central low-spin (LS) d7 CoII ion (S = 1/2) to a low-spin (LS) d6 CoIII ion (S = 0).

Two novel oxalato-bridged, trinuclear chromium(III)-cobalt(II) complexes have been prepared using as precursors mononuclear bis(oxalato)chromium(III) complexes with different aromatic diimine terminal ligands. Interestingly, they possess a moderately anisotropic S = 9/2 CrIII2CoII ground state resulting from the parallel alignment of the spins of the two terminal SCr = 3/2 CrIII ions and the central SCo = 3/2 CoII ion (for more details see our recent Hot Paper in Dalton Trans. 39, 2010, 2350).