lead, copper, cobalt, nickel, iron and zinc ions form monocitrate complexes (negative charge) in citrate solution which is absorbed on the citrate form of anion-exchange resins (citrate as counter ion) y exchange of citrate ion with citrate complexes. these are subsequently recovered from the resin by 0.5m ammonium citrate eluent at ph 2.0. under optimized conditions, quantitative recovery was ...

The natural vitamin B12-derivatives are intriguing complexes of cobalt that entrap the metal within strikingly skewed and ring-contracted corrin ligand. Here, we describe synthesis Rh(III)-corrin acetylrhodibalamin (AcRhbl) from biotechnologically produced metal-free hydrogenobyric acid analyze effect replacement cobalt-center organometallic B12-derivative acetylcobalamin (AcCbl) with its group...

Several metalloporphyrins, particularly highly chlorinated water soluble meso-tetraphenylporphyrins, have been shown to be good biomimetics of the lignin peroxidases which degrade lignin in vivo. Metal complexes of the water soluble phthalocyaninetetrasulfonic acid have been examined as catalysts for the oxidation of lignin since the phthalocyanines are readily available and inexpensive. The co...

Cobalt(ll) and gold(lll) react with 2,4-dihydroxy acetophenone oxime (RPO) formi ng yellowish brown and greyish green coloured soluble complexes respectively. The reactions are very slow but become fast in the presence of K2SPxThis may be due to the enhancement of aerial oxidation of metal complexes wi th RPO in their lower oxidation states (Co(! I), Au( III )) to coloured complexes with higher...