Elemental complex ionic

Complexation of metals with organic compounds can also increase the toxicity of metals. This is the case with mercury, in which the organo-Hg species, methyl- and dimethylmercury, are fer more toxic than elemental or ionic mercury (Hg (aq)). The enhanced toxicity is caused by the increased tendency of the organo species to be retained, and therefore concentrated within, organisms. As discussed in Chapter 28.6.8, mercury is naturally biomethylated by bacteria under conditions of low pH and low... 

Apart from complexes such as the alkoxides, dialkylamides, and organo compounds discussed in later sections, all of the Mg—Ra elements give ionic compounds in the solid state and in solutions. They form salts with common anions like the halides, NOj, RC02, CIO4, SO ", and so on. Because of its smaller size Mg2+ is the hardest of the ions. While Mg2+ and Ca2+ salts are usually hydrated, those of Sr, Ba, and Ra are commonly anhydrous. The coordination number for Mg2+ is almost invariably 6 but a few cases of 5, 7, and 8 coordination are known.20 The... 

Keywords metals metal ions heavy elements solution salvation speciation solubility s-elements p-elements d-elements f-elements complex ions ionic liquids... 

Sodium chloride (NaCl) contains only sodium and chlorine, and potassium iodide (KI) contains only potassium and iodine. Each is an example of a binary compound, which is a compound that contains only two elements. Binary ionic compounds can contain more than one ion of each element, as in Cap2, but they are not composed of three or more different elements, as are more complex compounds. 

Significant steric hindrance and the longer M-C bond in complexes of the type (C5Mes)3M induced another type of reaction, i.e., (CsMes) substitution reaction from the metal center [106]. Removal of (CsMes) is very reasonable due to the steric crowding in these long bonded organometallics. The loss of (CsMes) anions from (CsMes)sM complexes by ri -alkyl or SIR pathways is well known [94], but the removal of (CsMes) rings from/ element complexes by ionic metathesis is not a common reaction. 

The reactivity of the transition metal complexes changes as you go down the Group of the d-block elements. The ionic radius increases due to the fact that the electron cloud around the nucleus gets larger. This leads to weaker... 

Magnetic-susceptibility measurements of polyaminocarboxylate complexes agreed with a model of predominantly ionic interactions (Moeller and Horwitz 1959). Additional evidence for the ionic nature of the bonding in the f-element complexes is found in the linear correlation of the log of the stability constant for complexation, log of... 

Using Crystal Structures of Ionic Compounds to Explore Complexation and Extraction of Rare Earth Elements in Ionic Liquids... 

The most common oxidation state of niobium is +5, although many anhydrous compounds have been made with lower oxidation states, notably +4 and +3, and Nb can be reduced in aqueous solution to Nb by zinc. The aqueous chemistry primarily involves halo- and organic acid anionic complexes. Virtually no cationic chemistry exists because of the irreversible hydrolysis of the cation in dilute solutions. Metal—metal bonding is common. Extensive polymeric anions form. Niobium resembles tantalum and titanium in its chemistry, and separation from these elements is difficult. In the soHd state, niobium has the same atomic radius as tantalum and essentially the same ionic radius as well, ie, Nb Ta = 68 pm. This is the same size as Ti ... 

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