Synthesis and properties of the complex of 1,4,7,10,13,16-hexaoxacyclooctadecane with potassium perchlorotriphenylmethide

A Molecular Multiproperty Switching Array Based on the Redox Behavior of a Ferrocenyl Polychlorotriphenylmethyl Radical

“…On other hand the IVCT band is absent, in agreement with the lack of electron‐donor character of the organometallic unit when it is oxidized. In carbanion 1 − the typical radical absorptions are not observed while an intense absorption at 534 nm, characteristic of PTM anions, is present 12. As for 1 + , the broad IVCT absorption in the NIR region of 1 vanishes in 1 − confirming the absence of an electron‐acceptor capability in the reduced triphenylmethyl unit in 1 − .…”

Ein molekularer, multifunktioneller Schalter auf der Basis des Redoxverhaltens eines Ferrocenyl‐Polychlortriphenylmethyl‐Radikals

“…Die IVCT‐Bande fehlt jedoch, in Übereinstimmung mit dem verringerten Elektronendonor‐Charakter der oxidierten organometallischen Gruppe. Das Carbanion 1 − zeigt keine typischen Radikalabsorptionen, aber eine intensive Bande bei 534 nm, charakteristisch für PTM‐Anionen 12. Wie bei 1 + fehlt hier wegen der nicht vorhandenen Elektronenacceptor‐Fähigkeit der reduzierten Triphenylmethyl‐Einheit die breite IVCT‐Absorptionsbande im NIR‐Bereich.…”

The perchlorotriphenylmethyl (PTM) radical

“…The dihedral angles between the planes of the phenyl groups and the reference plane are also similar to those exhibited by the benzene clathrate of the neutral PTM radical (53.8, 53.4 and 46.3 ). In contrast, PTM anion or cation derivatives exhibit slightly smaller angles between the rings and their reference plane, the values being 45, 45 and 40 for the 1:1 complex of potassium perchlorotriphenylmethide and 18-crown-6 (Miravitlles et al, 1985;Veciana et al, 1985) and 46 for perchlorotriphenylcarbenium hexachloroantimonate(V), which also presents the most symmetrical conformation (Molins et al, 1996).…”