During asymmetric cyanohydrin synthesis catalysed by vanadium(V)oxo(salen) complexes, the catalysts are reduced to vanadium(IV)oxo(salen) as determined by EPR spectroscopy; the reducing agent is cyanide which is oxidised to cyanogen via a non-radical mechanism.

The pancreatic cancer is the fourth leading cause of cancer-related death and characterized by one of the lowest five-year survival rate. The current therapeutic options are demonstrating minimal effectiveness, therefore studies on new potential anticancer compounds, with non-significant side effects are highly desirable. Recently, it was demonstrated that vanadium compounds, in particular orga...

The synthesis and structural characterization of two families of low-valent vanadium(III) {V6P4} and vanadium(III/IV) {V13P8} phosphonate complexes are reported. Magnetic characterization is reported for representative examples.

In this study, electronic structures of ground state of pure vanadium sub-nano clusters, Vn (n=2-5), and their interactions with small ligands for example CO and triplet O2 molecules are investigated by using density functional theory (DFT) calibration at the mPWPW91/QZVP level of theory. The favorable orientations of these ligands in interaction with pure vanadium sub-nano clusters were determ...

LO81 MODELS FOR THE ACTIVE SITES IN THE MANGANESE CATALASE, OXYGEN EVOLVING COMPLEX AND VANADIUM BROMOPEROXIDASE. V.L. Pecoraro, X. Li, J.A. Bonadies, MS. Lab, E. Larson and S. Saadeh, Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-I 055, USA. Schiff Base and a-hydroxy acid complexes of manganese will be presented as models for the spectroscopic and reactivity behavior of ...

Reactions of the salicylaldehyde 4-phenylthiosemicarbazone (H(2)L) with selected vanadium(iv) and vanadium(v) precursors ([VO(acac)(2)], [VO(OAc)(2)], VOSO(4), [V(2)O(4)(acac)(2)]) were investigated under aerobic conditions in different alcohols (methanol, ethanol, propanol). In all examined cases mononuclear alkoxo vanadium(v) complexes [VOL(OR)] (1) (OR = OMe, OEt, OPr) were isolated as major...

The reaction of vanadium(III) trichloride with tert-butylphosphonic acid (t-BuPO3H2) in the presence of 1,10-phenanthroline/2,2'-bipyridine as an ancillary ligand in acetonitrile at room temperature afforded two dinuclear dicationic vanadium(IV) complexes [(VO)2(phen)2{t-BuPO2(OH)}2(OH2)2]·2Cl [1] and [(VO)2(bipy)2{t-BuPO2(OH)}2(OH2)2]·2Cl [2]. On the other hand, when the reaction was carried o...

Very few nitrosyl derivatives of the first transition elements are known [1, 2], [^-C5HsCr(NO)2]2 has been obtained by reduction of ^-CsHsCrNOCl with sodium borohydride [3]. The only known cyclopentadienylnitrosyl vanadium complexes are T?-C5H5V(NO)2CO [4] and the cation [>?-C5H5V(NO)3]+ [5]. The most important methods used to obtain these complexes consist of treatment of carbonyl complexes wi...

In a systematic effort to identify a potent antiproliferative agent, four complexes of vanadium containing maltol and deferiprone ligands were synthesized and evaluated for their cytotoxic activity against five human and animal cancer cell lines, including human breast cancer cells (MCF-7), human cervix epithelial carcinoma (HeLa), human colon cancer cell line (HT-29), human leukemia cell line ...

The authors describe the influence of vanadyl sulphate on liver Golgi complexes in control and streptozotocin (STZ)-diabetic rats. VOSO4, one of inorganic vanadium compounds widely used in animal models and human diabetes, acts as an insulin-mimetic drug and is relatively well known as a complex activated or inhibited on many enzymes involved in carbohydrate or lipid metabolic pathways. A relat...