Photoactive Polyoxometalate/DASA Covalent Hybrids for Photopolymerization in the Visible Range.

The synthesis of TBA-DASA-POM-DASA, the first photoactive covalent hybrid polyoxometalate (POM) incorporating a donor-acceptor Stenhouse adduct (DASA) reverse photochrome, is presented. It has been evidenced that in solution the equilibrium between the colorless cyclopentenone and the highly colored triene conformers is strongly dependent not only on the nature of the solvent but also the countercations, allowing to tune its optical properties. This complex has been further associated to photochromic spironaphtoxazine cations, resulting in a material which can be activated by two distinct optical stimuli.

An unprecedented {NiSiW} hybrid polyoxometalate with high photocatalytic hydrogen evolution activity.

A unique polyoxometalate complex made up of a tetradecanuclear nickel bisphosphonate cluster capping a {SiW9} unit has been characterized. This stable compound exhibits a high hydrogen evolution reaction photocatalytic activity under visible light irradiation via a reductive quenching mechanism.

Anderson-Type Polyoxometalates Functionalized by Tetrathiafulvalene Groups: Synthesis, Electrochemical Studies, and NLO Properties.

Three polyoxometalates (POMs) functionalized by tetrathiafulvalene (TTF) molecules have been synthesized by a coupling reaction between the Anderson-type POMs [MnMoO{(OCH)CNH}] or [AlMoO(OH){(OCH)CNH}] and the TTF carboxylic acid derivative (MeS)TTF(S-CH-COH). The monofunctionalized TTF-AlMo POM contains one TTF group covalently grafted on an Al Anderson platform. The symmetrical TTF-MnMo-TTF POM possesses two TTF groups grafted on each side of a Mn Anderson derivative while the asymmetrical TTF-MnMo-SP POM contains a TTF and a spiropyran groups.

Anticancer Activity of Polyoxometalate-Bisphosphonate Complexes: Synthesis, Characterization, In Vitro and In Vivo Results.

We synthesized a series of polyoxometalate-bisphosphonate complexes containing MoO octahedra, zoledronate, or an N-alkyl (n-C or n-C) zoledronate analogue, and in two cases, Mn as a heterometal. MoL (L = Zol, ZolC, ZolC) and MoLMn (L = Zol, ZolC) were characterized by using single-crystal X-ray crystallography and/or IR spectroscopy, elemental and energy dispersive X-ray analysis and P NMR. We found promising activity against human nonsmall cell lung cancer (NCI-H460) cells with IC values for growth inhibition of ∼5 μM per bisphosphonate ligand.