Vanadium is omnipresent in trace amounts in the environment, in food and also in the human body, where it might serve as a regulator for phosphate-dependent proteins. Potential vanadium-based formulations – inorganic and coordination compounds with organic ligands – commonly underlie speciation in the body, that is, they are converted to vanadate(V), oxidovanadium(IV) and to complexes with the body's own ligand systems. Vanadium compounds have been shown to be potentially effective against diabetes Type 2, malign tumors including cancer, endemic tropical diseases (such as trypanosomiasis, leishmaniasis and amoebiasis), bacterial infections (tuberculosis and pneumonia) and HIV infections. Furthermore, vanadium drugs can be operative in cardio- and neuro-protection. So far, vanadium compounds have not yet been approved as pharmaceuticals for clinical use.
Abstract Die gemäß dem Formelschema dargestellten Verbindungen (III) (verbesserte Synthese), (VI), (VIII) und (XI) werden IR‐ und "V‐NMR‐spektroskopisch charakterisiert.
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis and structure of an alkyne-tetrabromoniobate(1-)Christian Felten, Falk Olbrich, and Dieter RehderCite this: Organometallics 1993, 12, 3, 982–984Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/om00027a060https://doi.org/10.1021/om00027a060research-articleACS PublicationsRequest reuse permissionsArticle Views34Altmetric-Citations10LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts
Abstract The title compound crystallizes in the monoclinic space group P2 1 /c with a = 822.0(1), b = 1126.4(2), c = 1629.0(2) pm and β = 103.54(1)°. The two vanadium centers of the anion, which is an edge-bridged bioctahedron, are asymmetrically connected by bridging chloroligands; V -(μ -Cl) bond lengths are 238.4 und 278.3 pm , respectively. ESR and IR characteristics are discussed.
This chapter takes a closer look at early transition metals molybdenum, tungsten, and vanadium which are involved in many catalytically conducted two-electron transfer reactions, commonly accompanied by oxygenation and deoxygenation. Nature employs these metals as active centres in enzymes in a variety of oxidation and reduction reactions. These elements are also used in industrial contexts, commonly in steel production or, in the form of their oxides, to catalyze oxidation reactions, exploiting the ease of the change in oxidation states. The chapter discusses the Molybdo- and tungsto-pyranopterins and considers an assortment of representatives of the four Mo/W-pyranopterin families: the xanthine oxidase family, sulfite oxidase family, dimethyl sulfoxide reductase family, and aldehyde: ferredoxin oxidoreductase family. In addition, the chapter tackles the vanadate-dependent haloperoxidases.
V0 2+ forms complexes of composition VO(L 1 )EtOH), VO(HL 1 ) 2 and VO(HL 2 )(H 2 O) with the ithium or sodium salts of 6-droxymethyl-pyridine-2-arboxylic acid (H 2 L 1 ) and 4,8-hydroxyquinoline-2-carboxylic acid (H 3 L 2 ). VCl 2 (salen/salphen) and VCl 2 (napgly/ nappa) (napgly and nappa are the Schiff bases derived from o-ydroxynaphthaldehyde and glycine or phenylalanine, respectively), prepared from the oxo precursor and SOCl 2 , react with Li 2 L 1 and the lithium salts of benzilic acid (H 2 L 3 ) and ortho-ydroxybenzoic acid (H 2 L 4 ) to yield the non-oxo (“bare”) complexes V(salen)L 1 , V(salen)L 3 , V(salphen)L 3 , V(salen)L 4 , V(napgly)L 1 , V(nappa)L 1 , and V(nappa)L 4 . The complexes have been characterized by IR, EPR and elemental analyses. VOCl 2 (salen) crystallizes in the monoclinic space group Cc, a = 14.579(3), b = 9.537(2), c = 13.453(3) Å, β=120.92(3)°. The molecule exhibits gross distortions from octahedral geometry. An improved synthesis for H 2 L 1 is described.
'%3e%3cpath fill='%23012169' d='M0 0v30h60V0z'/%3e%3cpath stroke='%23fff' stroke-width='6' d='m0 0 60 30m0-30L0 30'/%3e%3cpath stroke='%23C8102E' stroke-width='4' d='m0 0 60 30m0-30L0 30' clip-path='url(%23b)'/%3e%3cpath stroke='%23fff' stroke-width='10' d='M30 0v30M0 15h60'/%3e%3cpath stroke='%23C8102E' stroke-width='6' d='M30 0v30M0 15h60'/%3e%3c/g%3e%3c/svg%3e)
