Oxidative electrochemistry of compounds of the type (.eta.5-C5H5)2MX2 where M = Ti(IV), Mo(IV), and W(IV) and X = halide, thiolate, or ferrocenyl

New tungstenocenes containing 3-hydroxy-4-pyrone ligands: antiproliferative activity on HT-29 and MCF-7 cell lines and binding to human serum albumin studied by fluorescence spectroscopy and molecular modeling methods

“…3), which involves one-electron transfer attributed to W V/IV species, and a second, small reversible wave at 1.0 V, most likely corresponding to the solvated species ([Cp W IV (NCMe) Cl] + /[Cp 2 W V (NCMe)Cl] 2+ ) as previously reported [32]. [Cp 2 W(maltolato)]Cl, [Cp 2 W(ethyl maltolato)]Cl, and [Cp 2 W(kojato)]Cl showed two oxidation peaks.…”

“…[Cp 2 W(maltolato)]Cl, [Cp 2 W(ethyl maltolato)]Cl, and [Cp 2 W(kojato)]Cl showed two oxidation peaks. The first one corresponds to irreversible oxidation of W IV to W V in the range 0.67–0.73 V. Bulk electrolysis of previously reported tungstenocene complexes has shown that a one-electron oxidation (W IV/V ) process (1 faraday/mol) occurs in this range, 0.2–0.7 V [32]. The second one, the reversible redox couple in the range 0.89–0.92 V, is attributed to the 3-hydroxy-4-pyronato ligands.…”

Cyclopentadienyl Complexes of Chromium, Molybdenum and Tungsten

“…1 3 6 2 " " 4 The dithiolate complexes generally display three redox waves in MeCN, the first corresponding to the Mo IV /Mo v couple, the second to a second oxidation and also to [Mo(SR)(NCMe)Cp 2 ]\ and the third to [Cp 2 Mo(u-SR) 2 MoCp 2 ] 2+ , which could be isolated. 1267 1365 Unusual reactions were observed between [Mo(r| 2 -CS 2 )Cp 2 ] and activated alkynes to produce the metallacycle [Mo{C(=S)SCR=CR}Cp 2 ] and its 5, C-bound isomer. With HOCCN incorporation o f two alkyne molecules occurs and the metallacycle becomes linked to one Cp ligand.…”

Reactions of α,ω-dithiolate ligands with bis(cyclopentadienyl)molybdenum dichloride; crystal structures of Mo(η-C5H5)2{S(CH2)nS)} (n=2, 3) and a layered hydrate, Mo(η-C5H5)2(SCH2CH2O)·4.5H2O

“…The metal(IV) derivatives can be oxidized to V and VI oxidation states, as demonstrated electrochemically [4,12]; the higher oxidation state species are generally 0022-328X/$ -see front matter Ó 2004 Elsevier B.V. All rights reserved. doi:10.1016/j.jorganchem.2004.08.040 more stable when unsaturated dithiolene ligands are present [13,14], and the oxidative chemistry of some functionalized molybdocene-dithiolene derivatives has been reported [15][16][17]; nevertheless, simple molybdenum(VI) cations of formula [Mo(g-C 5 H 5 ) 2 (SR) 2 ] 2+ can be prepared by oxidations involving AsF 3 [18].…”

“…doi:10.1016/j.jorganchem.2004.08.040 more stable when unsaturated dithiolene ligands are present [13,14], and the oxidative chemistry of some functionalized molybdocene-dithiolene derivatives has been reported [15][16][17]; nevertheless, simple molybdenum(VI) cations of formula [Mo(g-C 5 H 5 ) 2 (SR) 2 ] 2+ can be prepared by oxidations involving AsF 3 [18]. Chemical oxidation by ferricenium salts followed by elimination of thio-radical is a pathway for the introduction of neutral 2-electron ligands [3,12], and more complex redox reactions form ligand-coupled products [19].…”