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[TiSCl4]2⊖ and [Ti3O(S2)3Cl6]2⊖, a Multinuclear Complex with a Structure Typical for Clusters

✍ Scribed by Prof. Dr. Ulrich Müller; Dipl.-Chem. Volker Krug

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
246 KB
Volume
27
Category
Article
ISSN
0044-8249

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✦ Synopsis

The C D spectra of electrochemically generated ions of (R)-( -)-1 and (S)-( +)-1 were recorded over the potential range 0 to -2200 mV. Figure shows the C D spectra of both enantiomeric forms of 12(oe', which were generated at a stationary potential of = -1600 rnV.

["] (S)-lz'oc) shows a positive A& for the longest wavelength absorption; in the case of (R)-12'oQ) the corresponding band has a negative AE value of equal intensity. The tetraanion (S)-( +)-1 4 0 generated at a potential of -2200 mV has a positive AE value for the intense band at d,,,=490 nm. A further band with positive A& is observed at 630 nm.

The reaction cycle between bianthraquinone 1 and bisradical anion 1 is electrochemically reversible over several measuring cycles. Racemization could not be observed. On the other hand, during the electrochemical formation of the tetraanion 140 with Bu4NPF6 as supporting electrolyte, a chemical secondary reaction can already be observed after the first

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