Conductivity and Properties of Two Charge Transfer Salts for Molecular Devices
Giovanni Spinelli a, Marina Freitag a
a School of Natural and Environmental Sciences, Newcastle University, UK, Newcastle upon Tyne, Reino Unido, Newcastle upon Tyne, United Kingdom
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Giovanni Spinelli, 246
Publication date: 20th April 2022

Two charger transfer salts were successfully synthesized, and their physical-chemical properties were investigated, including conductivity. They are formed by combining two organometallic complexes and the difference between them besides the transition metal in one of the two complexes. Dithiolene complexes with ligands similar to mnt (maleonitriledithiolate) have been largely studied during the past years showing applications in fields such as biochemistry and molecular devices for their attractive magnetic and electronic properties.1 Cu(Setra) has already been successfully applied in dye-sensitized solar cells as redox mediator with excellent results.2 The synthesis was performed by metathesis reaction with the two complexes showing equal charge but opposite. The project aimed to investigate how the properties of the two charger transfer salts change upon the substitution of the transition metal. The UV-Vis measurements showed similar absorption, but already during the cyclic voltammetry measurements, we appreciated the difference with the salt Cu-Cu showing three oxidation peaks while Ni-Cu just two. However, it is with the conductivity measurements that the biggest difference is revealed. In fact, the Ni-Cu did not show any conductivity, while Cu-Cu showed a semiconductor behaviour with a value of 10-8 (S/m). In conclusion, we demonstrated the effectiveness of how properties of a charge transfer salts can change by metal exchange, and the reason for this shift probably besides on the nature of the transition metal and its contribution in the lattice. However, to validate our measurements further computational analysis will be carried out.

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