Etude des composés d'addition d'acides de Lewis, XXXVII [1] composés d'addition de quelques quinones avec TiCl4, et relation entre les fréquences carbonyle et diverses grandeurs physicochimiques

✍ Scribed by R. Giallonardo

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: German
• Volume: 54
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19710540813

✦ Synopsis

Abstract

1:1 or 1:2 solid stoichiometric adducts of TiCl~4~ with anthraquinone‐1,4, anthraquinone‐1,2, naphtacenequinone‐5,12, pentacenequinone‐6,13 have been prepared. The very important lowering Δω(CO) of the respective IR. carbonyl frequencies, ranging from −160 to −100 cm^−1^, shows that the acceptor is linked by a dative bond to the carbonyl oxygen atom acting as donor. On the basis of calculations and various considerations, the reduction of the CO double bond character is confirmed. Linear relations are found to exist between the oxydo‐reduction or the polarographic reduction potential of the quinones, and their antisymetric ω~a~(CO) frequencies, the values of Δω, and the O → Ti vibrations, respectively.