Naslov
Bistability of Fc-PTM-Based Dyads: The Role of the Donor Strength

Autori
Guasch, Judith ; Grisanti, Luca ; Jung, Stefan ; Morales, Dayana ; D’Avino, Gabriele ; Souto, Manuel ; Fontrodona, Xavier ; Painelli, Anna ; Renz, Franz ; Ratera, Imma ; Veciana, Jaume

Izvornik
Chemistry of Materials (0897-4756) 25 (2013), 5; 808-814

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
bistability, molecular crystals

Sažetak
Bistability of valence tautomeric donor–acceptor dyads formed by covalently linking a ferrocene-based electron-donor and the perchlorotriphenylmethyl radical, as the electron-acceptor, is tuned via a chemical modification of the ferrocene group. Specifically, the methylation of the ferrocene unit increases the strength of the donor group stabilizing the zwitterionic state in polar solvents and leading to an intriguing coexistence of neutral and zwitterionic species in solvents of intermediate polarity. Bistability in the crystalline phase is demonstrated by temperature dependent Mössbauer spectra. This complex and interesting behavior is quantitatively rationalized in the framework of a bottom-up modeling strategy. Optical spectra in solution are first analyzed to extract and parametrize an effective two-state molecular model, which is then adopted to rationalize the observed bistability in the solid state as due to cooperative electrostatic interchromophore interactions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA