The new acyclic and potentially heptadentate dinucleating ligand, 2,6-bis(N,N-bis-(2-pyridylmethyl)-sulfonamido)-4-methylphenolato (bpsmp(-)) contains two tertiary sulfonamide groups. The sulfonamide donors permit a greater degree of control over the accessibility of mono versus dinuclear complexes compared to their closely related amine-containing counterparts, on account of their relatively weaker donor properties. A series of air-stable dinuclear complexes of Co(II), Mn(II) and Cu(II) containing two auxiliary acetate ligands have been prepared. The absence of acetate in reaction mixtures containing Co(II) and Mn(II) led to mononuclear complexes, with water ligands completing the coordination spheres of the metal ions, even in the presence of large excess of the metal ions. Thus, bridging acetate ligands appear to stabilise the dinuclear structures for the relatively labile Co(II) and Mn(II) ions. A mononuclear complex of V(IV)=O was isolated even in the presence of acetate, possibly because the oxyl groups on each V(IV) prevent formation of a bis-acetato-bridged complex. Reaction of one equivalent of CuCl(2) with bpsmpH led to isolation of two different mononuclear complexes, dependent on the identity of the solvent. The phenol group is coordinated in only one of these complexes. A dinuclear Cu(II) complex was isolated when two equivalents of the metal salt were used in the reaction.

The first structurally characterized Fe(II)-Fe(III) complex containing a M2(mu-OH)2 diamond core is a Robin and Day class II mixed-valence complex.

A divanadium complex shows remarkable selectivity for arsenate in substitution reactions with oxoanions.

The dinuclear VIV=O complex of 2,6-bis{[N,N-bis(2-pyridylmethyl)amino]methyl}-4-tert-butylphenolato (bpbp-), [(V=O)2bpbp(OH2)2](ClO4)3.H2O, is oxidised by air. Two products have been characterised in the solid state, namely a VVVV diperoxido complex, [(V=O)2bpbp(eta2-O2)2](ClO4), and a VVVIV trioxido complex, [V(O)2V(O)bpbp(OH2)](ClO4)(2).2H2O.EtOH, . The rate of formation of is solvent-dependent and is fastest in 2-propanol, compared to methanol or tetrahydrofuran. A transient species postulated to be a VV hydroperoxido species was detected during the course of this relatively slow reaction, which takes place on a timescale of hours to days. Concentration appears to be the factor determining whether complex or complex is obtained from reactions of with air: at higher complex concentrations formation of rather than is presumed to occur via a bimolecular reaction between the starting VIV complex and a reactive oxidized adduct.

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Key indicatorsSingle-crystal X-ray study T = 120 K Mean '(C±C) = 0.003 A Ê Disorder in solvent or counterion R factor = 0.032 wR factor = 0.034 Data-to-parameter ratio = 16.2 For details of how these key indicators were automatically derived from the article, see

Key indicatorsSingle-crystal X-ray study T = 180 K Mean (C±C) = 0.004 A Ê R factor = 0.040 wR factor = 0.102 Data-to-parameter ratio = 16.7For details of how these key indicators were automatically derived from the article, see