Stellated cuboctahedron of Fe.

The solvothermal reaction of FeCl ⋅ 4HO and HTBC[4] in a basic dmf/EtOH solution affords an [Fe ] Keplerate conforming to a stellated cuboctahedron. Magnetic and heat capacity measurements reveal spin frustration effects arising from the high symmetry. A crossover between inverse and direct magnetocaloric effects is observed at ~10 K for applied-field changes lower than 3 T.

Odd and Even Numbered Ferric Wheels.

The structurally related odd and even numbered wheels [Fe Zn (tea) (teaH) (OMe)Cl ] (1) and [Fe Zn (tea) Cl ] (2) can be synthesized under ambient conditions by reacting Fe and Zn salts with triethanolamine (teaH ), the change in nuclearity being dictated by the solvents employed. An antiferromagnetic exchange between nearest neighbors, J = -10.0 cm for 1 and J = -12.

An [Fe] molecular oxyhydroxide.

An [Fe] hexagonal bipyramid displays antiferromagnetic exchange between the two capping tetrahedral ions and the six ring octahedral ions resulting in a spin ground state of = 10.

An [FeIII30] molecular metal oxide.

Dissolution of FeBr in a mixture of acetonitrile and 3,4-lutidine in the presence of an amine results in the formation of an [Fe] molecular metal oxide containing alternating layers of tetrahedral and octahedral Fe ions. Mass spectrometry suggests the cluster is formed quickly and remains stable in solution, while magnetic measurements and DFT calculations reveal competing antiferromagnetic exchange interactions.

[Fe]: a frustrated, centred tetrakis hexahedron.

The combination of two different Fe salts in a solvothermal reaction with triethanolamine results in the formation of a high symmetry [FeIII15] cluster whose structure conforms to a centred, tetrakis hexahedron.

Synthesis and Characterization of Symmetrically Unsymmetrically Proton-Bridged Hexa-Iron Clusters.

Syntheses and magnetic and structural characterization of hexa-iron complexes of derivatized salicylaldoximes are discussed. Complexation of Fe(BF)·6HO with each ligand (H and H ) in a methanolic-pyridine solution resulted in hexa-iron compounds ( and , respectively), which each contain two near-parallel metal triangles of [Fe-μ-O], linked by six fluoride bridges and stabilized by a hydrogen-bonded proton between the μ-O groups. Within each metal triangle of , Fe(III) ions are connected the amine "straps" of (H -2H).

Magneto-structural studies of an unusual [MnMnGd(OR)] partial cubane from 2,2'-bis--Bu-calix[4]arene.

Reaction of 2,2'-bis-p-tBu-calix[4]arene (H8L) with MnCl2·4H2O, GdCl3·6H2O and 2,6-pyridinedimethanol (H2pdm) affords [MnIIIMnIIGdIII(H3L)(pdmH)(pdm)(MeOH)2(dmf)]·3MeCN·dmf (3·3MeCN·dmf) upon vapour diffusion of MeCN into the basic dmf/MeOH mother liquor. 3 crystallises in the tetragonal space group P41212 with the asymmetric unit comprising the entire cluster. The highly unusual core contains a triangular arrangement of MnIIIMnIIGdIII ions housed within a [MnIIIMnIIGdIII(OR)4]4- partial cubane.

The first amino acid bound manganese-calcium clusters: a {[MnCa]} methylalanine complex, and a [MnCa] trigonal prism.

An amino acid containing octanuclear heterometallic {[MnCa]} cluster has been synthesized, alongside a structurally-related trigonal prismatic [MnCa] cage.

An [Fe ] Molecular Metal Oxide.

The dissolution of anhydrous iron bromide in a mixture of pyridine and acetonitrile, in the presence of an organic amine, results in the formation of an [Fe ] metal oxide molecule, structurally characterised by alternate layers of tetrahedral and octahedral Fe ions connected by oxide and hydroxide ions. The outer shell of the complex is capped by a combination of pyridine molecules and bromide ions. Magnetic data, measured at temperatures as low as 0.

New salicylaldoximato-borate ligands resulting from anion hydrolysis and their respective copper and iron complexes.

Anion hydrolysis reactions between salicylaldoximato ligands (L'-L''') and copper and iron BF metal salts, have resulted in the formation of new salicylaldoximato borate containing transition metal complexes: [Fe(L' + 2H)](BF)(MeOH) (C1), [Fe(L'' + 4H)(OH)(Py)](BF)(HO)(Py) (C2), and [Cu(L''' + H)Cl] (C3). Each of the complexes have been structurally characterised, revealing the indirect role boron plays in the formation of these complexes. For complexes C1 and C2, Mössbauer spectroscopy confirmed the existence of Fe(iii) oxidation states.