- Pulsed CO2 laser induced chemistry of vanadium oxytrichloride (VOCl3)
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Pulsed CO2 laser multiple photon excitation of VOCl3, under collisional and collision-free conditions, resulted in dissociation via its ground electronic state and in a visible fluorescence.The photodissociative pathways leading to product formation were found to be both pressure and laser fiuence dependent.Low pressure and laser fluence led to the formation of VOCl2 while high pressure and laser fluence flavored VO.The prompt fluorescence was also studied as a function of pressure and laser fluence, and was shown to arise from a spontaneous one-photon radiative decay from an electronic state belonging to the VOCl2 fragment.The reaction mechanisms leading to product formation as well as models for populating a fragment's electronic state are proposed and discussed in conjunction with present multiphoton excitation and dissociation theory.In addition, CO2 laser induced dielectric breakdown of VOCl3, in the neat and with scavenger gases, resulted in the production of various vanadium oxides.The products are finely divided particles of very large surface area and high purity.
- Sausa, R. C.,Ronn, A. M.
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- Proof of existence and thermochemical characterization of the gaseous molecule VOCl2
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By use of the Knudsen-cell mass spectrometry the existence of VOCl2(g) is proven. Lines of fragmentation are set up for VOCl3(g). The vapor above V2O3(s) with Cl2(g) is examined. The sublimation of VOCl2 is measured at a temperature of 550-620 K. By 2nd law calculations the heat of sublimation is defined. The calculation for the gaseous VOCl2 leads to ΔBH°(VOCl2(g), 298 K) = -(130,4 ± 1,5) kcal · mol-1. The influence of VOCl2(g) for chemical vapor transport reactions of vanadium oxides with Cl2 is discussed by equilibrium calculations. Johann Ambrosius Barth 1996.
- Hackert,Plies,Gruehn
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- Photoactivated cytotoxicity of ferrocenyl-terpyridine oxovanadium(IV) complexes of curcuminoids
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Oxovanadium(IV) complexes, viz. [VO(Fc-tpy)(Curc)](ClO4) (1), [VO(Fc-tpy)(bDHC)](ClO4) (2), [VO(Fc-tpy)(bDMC)](ClO4) (3) and [VO(Ph-tpy)(Curc)](ClO4) (4), of 4′-ferrocenyl-2,2′: 6′,2″-terpyridine (Fc-tpy) and 4′-phenyl-2,2′:6′, 2″-terpyridine (Ph-tpy) and monoanionic curcumin (Curc), bis-dehydroxycurcmin (bDHC) and bis-demethoxycurcumin (bDMC) were prepared, characterized and their photo-induced DNA cleavage activity and photocytotoxicity in visible light studied. The ferrocenyl complexes 1-3 showed an intense metal-to-ligand charge transfer band near 585 nm in DMF and displayed Fc+/Fc and V(IV)/V(III) redox couples near 0.65 V and -1.05 V vs. SCE in DMF-0.1 M TBAP. The complexes as avid binders to calf thymus DNA showed significant photocleavage of plasmid DNA in red light of 647 nm forming OH radicals. The complexes showed photocytotoxicity in HeLa and Hep G2 cancer cells in visible light of 400-700 nm with low dark toxicity. ICP-MS and fluorescence microscopic studies exhibited significant cellular uptake of the complexes within 4 h of treatment with complexes. The treatment with complex 1 resulted in the formation of reactive oxygen species inside the HeLa cells which was evidenced from the DCFDA assay.
- Balaji, Babu,Balakrishnan, Babita,Perumalla, Sravanakumar,Karande, Anjali A.,Chakravarty, Akhil R.
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p. 458 - 467
(2014/11/08)
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- Reactions of vanadocene and its monochloride with p-toluenesulfonyl chloride
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The reactions of Cp2V and Cp2VCI with p-toluenesulfonyl chloride were studied. Depending on the ratio of the reagents, the solvent, and other reaction conditions, the compounds p-MeC6H4SO2VCp2/s
- Gordetsov,Latyaeva,Zimina,Levakova,Cherkasov,Moseeva,Skobeleva
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p. 1214 - 1217
(2007/10/03)
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