Yes, it is possible to enhance the solid-state electrical conductivity of metal complexes by using another metal ion, a process known as doping. Doping involves introducing small amounts of foreign atoms or ions into a material's structure to modify its properties, including electrical conductivity.
In the context of metal complexes, doping with another metal ion can have several effects on the solid-state electrical conductivity:
Charge Carrier Generation: The introduction of a different metal ion can lead to the creation of charge carriers (electrons or holes) in the material's electronic structure. These charge carriers are responsible for the material's electrical conductivity. The presence of the dopant metal ions can alter the electronic band structure of the host metal complex, allowing for enhanced charge transport.
Improved Carrier Mobility: Doping can improve the mobility of charge carriers within the material. The dopant ions can influence the lattice structure, grain boundaries, and defects, leading to more efficient movement of charge carriers and consequently higher electrical conductivity.
Altered Energy Levels: Doping can modify the energy levels within the material's band structure. This can lead to the creation of energy states that facilitate charge transport and reduce the energy barriers that charge carriers need to overcome, resulting in improved conductivity.
Higher Carrier Concentration: The presence of dopant metal ions can increase the overall concentration of charge carriers in the material. This higher carrier concentration contributes to enhanced electrical conductivity.
Synergistic Effects: Sometimes, the combination of different metal ions can create synergistic effects that enhance the material's conductivity beyond what would be expected from the individual components.
Doping metal complexes with another metal ion is a technique commonly used to tailor the electrical properties of materials for specific applications. For example, in the field of organic electronics, metal complexes are often used as organic semiconductors in devices like organic solar cells and organic light-emitting diodes. Doping these complexes with other metal ions can enhance their charge transport properties and improve device efficiency.
However, the success of doping depends on factors such as the choice of dopant metal ion, its concentration, the host metal complex's structure, and the method of fabrication. Careful optimization is necessary to achieve the desired enhancement in solid-state electrical conductivity without introducing unwanted side effects.
I feel like the question is quite vague. Which metal complex, with which other metal complex? Or what class of complexes with what other class of complexes? It's not at all clear if you are referring to metalation, substitution, doping, counterions, auxilary ligands or what?
The way the question reads you have a metal complex and you are unhappy with it's solid state properties. So make another, and test it's properties. Or specify in more detail what it is that you are trying to accomplish.