Dicyclopentaannelated Hexa? <i>peri</i> ?hexabenzocoronenes with a Singlet Biradical Ground State

Singlet-ground-state Magnets Coupled with Nuclear Spins. Systems with Singlet-doublet and Singlet-triplet Ions

Magnetic properties are studied of a system having two types of electronic singlet-ground-state ions, d-ion (singlet-doublet) and t-ion (singlet-triplet), by taking account of the hyperfine coupling. It is shown that the exchange interaction between the d-ion and the t-ion electronic spins affects crucially the magnetic properties. The results are discussed in connection with the experimental r...

Conversion of a singlet silylene to a stable biradical.

Discotic hexa-peri-hexabenzocoronenes with strong dipole: synthesis, self-assembly and dynamic studies.

Strong dipole moments have been built into two hexa-peri-hexabenzocoronene (HBC) derivatives (1 and 2) originating from the push-pull structure of the molecules with one electron-donating and one electron-withdrawing substituent. The influence of dipole moment on the self-assembly of HBCs in solution and in bulk has been investigated.

Biradical vs singlet oxygen photogeneration in suprofen–cholesterol systems

Cholesterol (Ch) is an important lipidic building block and a target for oxidative degradation, which can be induced via free radicals or singlet oxygen ((1)O2). Suprofen (SP) is a nonsteroidal anti-inflammatory drug that contains the 2-benzoylthiophene (BZT) chromophore and has a π,π* lowest triplet excited state. In the present work, dyads (S)- and (R)-SP-α-Ch (1 and 2), as well as (S)-SP-β-C...

Donor - Acceptor Cyclophanes with Biradical - Ionic Ground States

In donor-acceptor cyclophanes DA one expects an electron transfer from the donor D to the acceptor A already in •the ground state, i.e. DA-r D+ A-, if the DA distance and the d'ifference between the ionization energy In of D and the electron affinity EA of A are small enough. We shall use the term biradicalionic•2 (bi) for a state which can be symbolized as D+qA-q with q > 1/2. Whereas bi groun...