Auto-complexes

The color of the material is violet-brown. It is soluble in alcohol, ether, and acetone as well as esters to give a blue solution in each case—probably an auto-complex Co [Co (SON) 4]. In concentrated aqueous medium it is blue, but on dilution the color changes to the pink of hydrated cobalt (II) ions (dissociation of complex). [Pg.44]

Cadmium halides form auto-complex ions in concentrated solution. The anomedous transport number of Cd in Cdig solution was noticed by Hittorf (1859) and correctly attributed to the equilibrium ... [Pg.528]

Mercury(II) halides are too covalent to allow the free Hg + to appear its presence must be associated with auto-complex formation. Thus HgClg dissociates only slightly and then in an unusual way ... [Pg.528]

Some pure halides of divalent metals show a tendency to form auto-complexes. The ability to form auto-complexes according to the scheme... [Pg.18]

A typical example of a salt that forms auto-complexes is ZnCl2. The formation of complexes at melting takes place according to the scheme... [Pg.18]

For molten alkali-metal halides (KtX), the description of the equilibrium system is essentially complicated owing to the auto-complex structure of these melts. This kind of the melt structure can be presented as follows [370-373] ... [Pg.314]

Lithium alkyls in ether or benzene show a mean degree of association of from three to seven, whereas phenyl- and benzyllithium are dimeric in ether (17, 135). The lower degree of association in ether may stem from etherate formation. The structure of these auto-complexes may be analogous to that of beryllium and aluminum alkyls, or perhaps a lithium atom acts as a Lewis acid that is, Li [Li(C6H6)2]e. Wittig (135) favors this formulation over a phenyl bridging scheme. [Pg.83]

On the basis of the conductivity of the solution, Gutmann and Wegleitner [Gu 70] assumed the occurrence of auto-complex formation in nitrobenzene. The results of Mossbauer studies suggest that this assumption is probably incorrect the following equilibrium, proposed by de Main [De 59], is presumably established in the solution ... [Pg.158]

Formation of auto-complexes, mixed ligand complexes,... [Pg.197]

Important roles in the determination of the solution structure are played by the various, more complicated equilibria, also, e.g., solvent-induced auto-complex formation and the formation of mixed ligand and polynuclear complexes. [Pg.197]

The simplest form of auto-complex formation is illustrated by the equation... [Pg.197]

The role of auto-complex formation can be well seen, for example, in solutions of tin(IV) iodide in non-aqueous solvents [Ma 70]. When donor solvents are added to solutions of tin(IV) iodide in a non-coordinating solvent (e.g., nitrobenzene), the following equilibria may be assumed ... [Pg.198]

Auto-complex formation, although less marked, can also be detected in iron(III) chloride solutions [Gu 70] the equilibria are as follows ... [Pg.198]

It is worthy of special mention that auto-complex formation similarly occurs in the case of metal carbonyls when acted upon by high-donicity molecules [Ch 68, Hi 57a, Hi 57b, Hi 65]. This process is well illustrated by the following equation ... [Pg.198]

Cobalt (II) iodide is subject to auto complex formation in TMP and it is ionized in TMP, DMF, DMA and DMSO. Nickel iodide is completely ionized in TMP and DMS02. Tin(IV) iodide, bismuth(III) iodide, antimony(III) iodide, lead(II) iodide and cadmium (II) iodide are considerably ionized in DMF and completely ionized in DMSO. ... [Pg.161]

Nickel(II) chloride has somewhat lower solubilities than cobalt(II) chloride. NiCla" and NiCl4 are produced in acetonitrile and also in trimethyl phosphate where auto complex formation is appreciable . In tributyl phosphate the units were not identified with certaintyi, but very low stabilities of the chloride-coordinated nickel species are indicated. [Pg.164]

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