Metal ions can exist in several forms. Ion-exchange plays an important role in modern analytical chemistry. Transition metals can be separated using either anion or cation exchange chromatography, depending on the choice of complexing agent used in the eluent. Iron deficiency is the most common of nutritional anemia in human beings. It is also an essential component of myoglobin, cytochomes, ca...

We present a unique high magnetic field phase of the quasi-one dimensional organic conductor (TMTSF) 2 ClO 4. This phase, termed " Q-ClO 4 " , is obtained by rapid thermal quenching to avoid ordering of the ClO 4 anion. The magnetic field dependent phase of Q-ClO 4 is distinctly different from that in the extensively studied annealed material. Q-ClO 4 exhibits a spin density wave (SDW) transiti...

OBJECTIVES: High levels of transition metals such as iron, nickel, chromium, copper, and lead are closely related to free radical generation, lipid peroxidation, formation of DNA strand breaks, and tumor growth in cellular systems. In order to determine the correlation to malignant growth in humans, we investigated the accumulation of heavy metals in 20 breast cancer biopsies and compared the f...

Transition metals are involved in essential biological processes in plants since they are cofactors of metalloproteins and also act as regulator elements. Particularly, plant chloroplasts are organelles with high transition metal ion demand because metalloproteins are involved in the photosynthetic electron transport chain. The transition metal requirement of photosynthetic organisms greatly ex...

We review the recent progress in the theory of electron correlations in transition metals. Both qualitative picture and the quantitative results obtained for the magnetic moments, exchange splittings, Stoner parameter and magnetovolume effect of Fe, Co and Ni are presented and discussed in detail.

While boride clusters of alkali and transition metals have been observed and extensively characterized, so far little is known about lanthanide−boron clusters. Lanthanide−boride solids are intriguing, however, and therefore it is of interest to understand the fundamental electronic properties of such systems, also on the subnano scale. We report a joint experimental photoelectron spectroscopic ...

The chemistry of the hydrotris(mercaptobenzothiazolyl)borate anion (Tbz) with metal salts (HgI2, SbI3, BiI3, CoCl2) is reported in an attempt to probe the stability of the of Tbz ligand once coordinated to hard and soft metals. Complexes of Tbz with bismuth, containing the [Bi(Tbz)I3](-) anion, are stable, but with the other metals this is not the case. Although simple complexes such as [Hg(Tbz...

The development of selective functionalization strategies of white phosphorus (P4) is important to avoid the current chlorinated intermediates. The use of transition metals (TMs) could lead to catalytic procedures, but these are severely hampered by the high reactivity and unpredictable nature of the tetrahedron. Herein, we report selective first steps by reacting P4 with a metal anion [Cp*Fe(C...

A brief history of substances containing s,p- and d-block metals in negative oxidation states is described. A classification of these species and discussions of formal oxidation state assignments for low-valent transition metals in complexes are included, along with comments on the innocent and noninnocent character of ligands in metalates. Syntheses of highly reduced carbonyl complexes formall...

Pathogenic bacteria acquire transition metals for cell viability and persistence of infection in competition with host nutritional defenses. The human host employs a variety of mechanisms to stress the invading pathogen with both cytotoxic metal ions and oxidative and nitrosative insults while withholding essential transition metals from the bacterium. For example, the S100 family protein calpr...