Early-transition-metal hydrogenation catalysts have received less attention than comparable late-transition-metal systems, particularly since the discovery of Wilkinson s catalyst. This emphasis on late-transition-metal systems has been largely driven by practical concerns including functional-group tolerance and ease of handling. Further examination of early-transition-metal systems is particu...

A series of oxoperoxovanadium(V) complexes (ligands: H3nta ) nitrilotriacetic acid, H3heida ) N-(2hydroxyethyl)iminodiacetic acid, H2ada ) N-(2-amidomethyl)iminodiacetic acid, Hbpg ) N,N-bis(2-pyridylmethyl)glycine, and tpa ) N,N,N-tris(2-pyridylmethyl)amine) were characterized as functional models for the vanadium haloperoxidase enzymes. The crystal structures of K[VO(O2)Hheida], K[VO(O2)ada],...

Metals and metal compounds have been used in medicine for several thousands of years. In this review we summarized the anti-cancer activities of the ten most active metals: arsenic, antimony, bismuth, gold, vanadium, iron, rhodium, titanium, gallium and platinum. The first reviewed metal, arsenic, presents the anomaly of displaying anti-cancer and oncogenic properties simultaneously. Some antim...

51V NMR Spectra, Oxovanadium, Nitrosylvanadium, Hydroxylamidovanadium The 51V NMR spectra are recorded for 3 dinuclear complexes {VO (ONR2 )2 O and 13 mononuclear vanadium (-f V) and (+III) chelate complexes of the general formula [VXYZ]Q, where X = 02-, NO"; Y = 02~, 022" , R2NO~; and Z = picolinate-(pic), dipicolinate2(dipic), nitrilo-tri(2-propanolate)3_, and o-phenanthroline (phen). Shieldi...

Vanadium is the 22 most abundant element in the earth’s crust with an average concentration of 100 ppm. It exists in oxidation states ranging from 2to 5+ with 3+, 4+, and 5+ being the most common oxidation states. Vanadium is primarily used in the production of rust-resistant, spring, and high-speed tool steels; vanadium pentoxide is used in ceramics. Vanadium is released to the environment by ...