A modular and general synthetic method is disclosed for nonsymmetrical heterobimetallic bis-salphen structures starting from a series of synthetically convenient monometalated triimine precursors. This methodology permits the introduction of various combinations of metal ions within the bis-salphen framework potentially useful in multifunctional materials.
![Modular synthesis of heterobimetallic salen structures using metal templation](https://www.iciq.org/wp-content/uploads/2014/03/Modular-synthesis_5218.gif)