𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Perimeter-Type Structures in Charged [4n + 2] Annuleno [4n + 2] annulenes. The Importance of the Frontier-Orbitals

✍ Scribed by Walter Huber; Klaus Müllen; Christoph Schnieders; Masahiko Iyoda; Masazumi Nakagawa

Publisher
John Wiley and Sons
Year
1986
Tongue
German
Weight
345 KB
Volume
69
Category
Article
ISSN
0018-019X

No coin nor oath required. For personal study only.

✦ Synopsis

The tetra(terf-butyl)[l4]annuleno[l4]annulene 1 is transformed, oia alkali metal reduction, into its radical monoanion, dianion, radical trianion, and tetraanion. The paramagnetic species are characterized by ESR and ENDOR spectroscopy and the diamagnetic species by 'Hand I3C-NMR spectroscopy. Well-resolved ESR and NMR spectra can only be obtained, if the reduction is carefully monitored. For the interpretation of the data, the ions derived from the structurally related [14]-and [22]annulenes 3 and 5 as wcll from the tetra(tert-butyl)[l4]annuleno[l8]annulene 2 serve as suitable model compounds. While the behavior of the neutral annulenoannulene 1 is governed by that of the [ 14]annulene-subunit, the corresponding ionic systems can best be described as macrocyclic perimeters. This outcome can be rationalized by the nodal properties of the frontier MO's.

📜 SIMILAR VOLUMES

The 15N NMR Knight Shift and Electronic
The 15N NMR Knight Shift and Electronic Structure of SrMoO2.6N0.4 in the Pauli Paramagnetic State
✍ Xinhua Zhao; H.A. Eick 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 212 KB

The temperature-independent part \(\left(K_{0}\right)\) of the Knight shift, \(K\), of \(\mathrm{SrMoO}_{2.6} \mathrm{~N}_{0.4}\) in the Pauli paramagnetic state as determined from the \({ }^{15} \mathrm{~N}\) NMR spectrum is \(K_{0}=(2.87 \pm 0.01) \times 10^{-4}\), with respect to the external sol