Ligand dissolution

Complex-Forming Solutions. The solubHity of a metal can be enhanced by complexation using a suitable ligand. The dissolution of copper oxide in ammoniacal solutions is an example ... 

There is also a bewildering variety of structural motifs in polytelluride-ligand complexes as the brief selection in Fig. 16.10 indicates the original papers should be consulted for preparative routes and other details. Thus, dissolution of the alloy K2Hg2Te3 in ethylenedi-amine, followed by treatment with a methano-lic solution of [NBu JBr, yields the dark brown... 

While certain TSILs have been developed to pull metals into the IL phase, others have been developed to keep metals in an IL phase. The use of metal complexes dissolved in IL for catalytic reactions has been one of the most fruitful areas of IL research to date. LLowever, these systems still have a tendency to leach dissolved catalyst into the co-solvents used to extract the product of the reaction from the ionic liquid. Consequently, Wasserscheid et al. have pioneered the use of TSILs based upon the dissolution into a conventional IL of metal complexes that incorporate charged phosphine ligands in their stmctures [16-18]. These metal complex ions become an integral part of the ionic medium, and remain there when the reaction products arising from their use are extracted into a co-solvent. Certain of the charged phosphine ions that form the basis of this chemistry (e.g., P(m-C6H4S03 Na )3) are commercially available, while others may be prepared by established phosphine synthetic procedures. 

Such thiocyanate complexes are usually made by reaction of the ligand (L-L) with Pd(SCN)4- in a solvent like ethanol. A substantial amount of the Magnus-type salt [Pd(L-L)2][Pd(SCN)4] is often produced, convertible to the neutral Pd(L-L)(NCS)2 by dissolution in hot DMF and reprecipitating with water. 

Disiloxane, tetramesityl-, 3,206 Disproportionation iridium catalysts, 4,1159 Dissolution nuclear fuels, 6, 927 Distannene, 3,217 Distannoxane, 1,3-dichloro-, 3,207 Distibine, tetraphenyl-, 2,1008 Distibines, 2,1008 Disulfido ligands metal complexes, 2,531-540, 553 bonding, 2, 539 electron transfer, 2, 537 intramolecular redox reactions, 2,537 reactions, 2, 537... 

Sm(DippForm)2(THF)2 is isomorphous with the related strontium and barium amidinates. The trivalent samarate complex [Na(THF)5][Sml2(Dipp-Form)2(THF)2] was isolated in small quantities as a colorless by-product. Dissolution of this compound in hexane led to ligand redistribution to give homoleptic Sm(DippForm)3 with concomitant precipitation of Nal and SmlsfTHFls.s. The monofluoro-bis(amidinate) SmF(DippForm)2(THF) could also be isolated from Sm(DippForm)2(THF)2. ... 

Casey, W. H. and Ludwig, C. (1995). Silicate mineral dissolution as a ligand-exchange reaction. In "Chemical Weathering Rates of Silicate Minerals" (A. F. White and S. L. Brantley, eds), Mineralogical Society of America Washington, DC, Reviews in Mineralogy 31, 87-117. 

Dieker et al.67 used a similar method but applied a dropping amalgam electrode (DAE) and followed amperometrically by means of pulse polarography the anodic dissolution wave of mercury in the presence of an excess of ligand by appropriate choices of pH and titrant they achieved selective determinations of metal ions at low concentrations. 

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