Bogdan Botar

Acetate-driven polyoxometalate demetalation: An open-shell diiron polytungstate comprising two rotational Keggin isomers

The effect of acetate concentration on the formation of {SiW10Fe2}-based complexes is demonstrated by the synthesis of an open-shell diiron tungstosilicate derivative featuring two rotational Keggin isomer units.

[{(Mo)Mo5O21(H2O)3(SO4)}12(VO)30(H2O)20]36−: A molecular quantum spin icosidodecahedron

Self-assembly of aqueous solutions of molybdate and vanadate under reducing, mildly acidic conditions results in a polyoxomolybdate-based {Mo72V30} cluster compound Na8K16(VO)(H2O)5[K10 subset{(Mo)Mo5O21(H2O)3(SO4)}12(VO)30(H2O)20].150H2O, 1, a quantum spin-based Keplerate structure.

Acetate-controlled demetalation in multiiron polyoxometalates: A triiron cluster trapped between β- and γ-Keggin isomers

Acetate-induced demetalation of a {gamma-SiW(10)Fe(2)}-based dimer affords an acetato/hydroxo-bridged triiron cluster stabilized by two isomerically distinct Keggin units.

Polyoxometalate-directed assembly of water-soluble AgCl nanocubes

Out-of-pocket association of Ag(+) to the tetradentate defect site of mono-vacant Keggin and Wells-Dawson polyoxometalate (POM) cluster-anions is used to direct the formation of water-soluble AgCl nanocubes.

Ferrimagnetically ordered nanosized polyoxomolybdate-based cluster spheres

The self-assembly of molybdate building units in the presence of Fe(II) and V(IV) produces the first mixed-spin heterometal keplerate-type clusters displaying ferrimagnetic interactions.

A potassium selective ???nanosponge??? with well defined poresElectronic supplementary information (ESI) available: synthesis, selected data, and crystal data for 1. See http://www.rsc.org/suppdata/cc/b2/b210523n/Dedicated to Professor C. N. R. Rao on the occasion of his 70th birthday.

The novel spherical cluster-compound K2Na6[K20 [symbol: see text] Mo80-V22O282(SO4)12(H2O)66]. approximately 140H2O 1 has been obtained in a one-pot reaction and exhibits several remarkable structural features: 30 open shell centers, i.e. 8 Mov and 22 VIV spanning an icosidodecahedron, the incorporation of 20 K+ cations capping 20 appropriate [M6O6] pores/rings present at the surface of the spherical cluster-anion, and an encapsulated aggregate of water molecules.

Asymmetric terminal ligation on substituted sites in a disorder-free Keggin anion, [β-SiFe2W10O36(OH)2(H2O)Cl]5−

A new monomeric diiron beta-Keggin derivative, [(CH3)2NH2]5[beta-SiFe2W10O36(OH)2(H2O)Cl].7H2O (1) with non-adjacent substituted sites has been obtained in good yield by reaction of Fe(III) cations with [gamma-SiW10O36]8- in aqueous solution. The use of hydrogen bonding counter-cations produced a disorder-free polyanion. This situation facilitates unequivocal identification of the terminal ligands on Fe atoms and interpretation of the magnetic properties, which are also addressed by DFT calculations. Electrochemical studies establish that 1 can be step-wise reduced by two electrons and then reversibly oxidized.