Trinuclear, tetranuclear and octanuclear chalcogenido clusters of molybdenum and tungsten supported by trimethylphosphine ligands

Sattler, Aaron; Parkin, Gerard

doi:10.1016/j.poly.2014.06.019

Cited by 7 publications

(4 citation statements)

References 90 publications

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“…It is noticeable that CSD contains only a few homometallic molecular structures with a geometry similar to those of 5a and 7a , and all of them comprise [M 4 (μ 3 -S) 2 (μ-S) 4 ] (M = Mo, W) cores where the group 6 elements are not bridged by halogen atoms.…”

Section: Resultsmentioning

confidence: 99%

Systematic Approach for the Construction of Niobium and Tantalum Sulfide Clusters

et al. 2016

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Treatment of the imido complexes [MCl3(NR)py2] (R = (t)Bu, 2,6-Me2C6H3; M = Nb 1, 3; Ta 2, 4) (Xyl = 2,6-Me2C6H3) with (Me3Si)2S in a 1:1 ratio afforded the new cube-type sulfide clusters [MCl(NR)py(μ3-S)]4 (R = (t)Bu, 2,6-Me2C6H3; M = Nb 5, 7; Ta 6, 8) with loss of Me3SiCl. Reactions of 5 and 6 with cyclopentadienyllithium in 1:4 ratio resulted in the rupture of the coordinative M-S bonds and the replacement of a pyridine molecule and a chlorine atom by an η(5)-cyclopentadienyl group in each metal center, affording the compounds [M(η(5)-C5H5)(N(t)Bu)(μ-S)]4 (M = Nb 9, Ta 10). These processes may develop through formation of the complexes [M4(η(5)-C5H5)2(μ-Cl)(N(t)Bu)4py2(μ3-S)2(μ-S)2](C5H5) (M = Nb 11, Ta 12), also obtained by reaction of 5 and 6 with cyclopentadienyllithium in 1:3 ratio. As further evidence, 11 and 12 led to complexes 9 and 10 by treatment with one more equivalent of the lithium reagent. The structural study of these metal sulfide clusters has been also performed by X-ray crystallography.

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Section: Resultsmentioning

confidence: 99%

Systematic Approach for the Construction of Niobium and Tantalum Sulfide Clusters

et al. 2016

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“…The interesting coordination behavior and structural integrity of metal–metal bonded molybdenum(V) complexes make their chemistry a subject of enthusiastic research. , In the past two decades, there have been extensive studies on binuclear and polynuclear molybdenum(V) complexes containing metal–metal bonds, where molybdenum is found to be bridged through oxido, sulfido, telluro, chloride, or methoxido functionalities and the d-electrons of the Mo V center are localized into Mo V –Mo V single bonds . However, examples of bis-μ-imido bridged metal–metal bonded oxidomolybdenum(V) complexes are few in the literature although molybdenum(V) complexes with terminal imide groups have been long known.…”

Section: Introductionmentioning

confidence: 99%

Monomeric and Dimeric Oxidomolybdenum(V and VI) Complexes, Cytotoxicity, and DNA Interaction Studies: Molybdenum Assisted C═N Bond Cleavage of Salophen Ligands

et al. 2017

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Four novel dimeric bis-μ-imido bridged metal-metal bonded oxidomolybdenum(V) complexes [MoOL'] (1-4) (where L' are rearranged ligands formed in situ from HL) and a new mononuclear dioxidomolybdenum(VI) complex [MoOL] (5) synthesized from salen type NO ligands are reported. This rare series of imido-bridged complexes (1-4) have been furnished from rearranged HL' ligands, containing an aromatic diimine (o-phenylenediamine) "linker", where Mo assisted hydrolysis followed by -C═N bond cleavage of one of the arms of the ligand HL took place. A monomeric molybdenum(V) intermediate species [MoO(HL')(OEt)] (I) was generated in situ. The concomitant deprotonation and dimerization of two molybdenum(V) intermediate species (I) ultimately resulted in the formation of a bis-μ-imido bridge between the two molybdenum centers of [MoOL'] (1-4). The mechanism of formation of 1-4 has been discussed, and one of the rare intermediate monomeric molybdenum(V) species I has been isolated in the solid state and characterized. The monomeric dioxidomolybdenum(VI) complex [MoOL] (5) was prepared from the ligand HL where the aromatic "linker" was replaced by an aliphatic diimine (1,2-diaminopropane). All the ligands and complexes have been characterized by elemental analysis, IR, UV-vis spectroscopy, NMR, ESI-MS, and cyclic voltammetry, and the structural features of 1, 2, 4, and 5 have been solved by X-ray crystallography. The DNA binding and cleavage activity of 1-5 have been explored. The complexes interact with CT-DNA by the groove binding mode, and the binding constants range between 10 and 10 M. Fairly good photoinduced cleavage of pUC19 supercoiled plasmid DNA was exhibited by all the complexes, with 4 showing the most promising photoinduced DNA cleavage activity of ∼93%. Moreover, in vitro cytotoxic activity of all the complexes was evaluated by MTT assay, which reveals that the complexes induce cell death in MCF-7 (human breast adenocarcinoma) and HCT-15 (colon cancer) cell lines.

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“…[21][22][23][24] According to some reports, molybdenum compounds in the 5+ oxidation state generally take the form of binuclear cationic fragments [Mo 2 O 4 ] 2+ . 25,26 The remaining empty sites in central Mo can be completed by polydentate oxygen or nitrogenous ligands, so as to further aggregate to fabricate larger assemblies under certain conditions. 21 Moreover, these fashioned oxidomolybdenum(V) species [Mo 2 O 4 ] 2+ also have potential for application in electrochemistry, catalysis and engineering.…”

Section: Introductionmentioning

confidence: 99%

Binuclear, tetranuclear and hexadecanuclear thio-oxomolybdenum(v/iv) glycolates with selective adsorptions of gases

Lin

Deng

et al. 2023

Dalton Trans.

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Trinuclear, tetranuclear and octanuclear chalcogenido clusters of molybdenum and tungsten supported by trimethylphosphine ligands

Cited by 7 publications

References 90 publications

Systematic Approach for the Construction of Niobium and Tantalum Sulfide Clusters

Systematic Approach for the Construction of Niobium and Tantalum Sulfide Clusters

Monomeric and Dimeric Oxidomolybdenum(V and VI) Complexes, Cytotoxicity, and DNA Interaction Studies: Molybdenum Assisted C═N Bond Cleavage of Salophen Ligands

Binuclear, tetranuclear and hexadecanuclear thio-oxomolybdenum(v/iv) glycolates with selective adsorptions of gases

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