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The combination of a palladium(ii) precursor with a diimine-phenol ligand and an oxidant (H2O2 or O2) under different conditions has, serendipitously, given both a molecular square and a molecular tetrahedron by self-assembly of building blocks comprising palladium(ii) centres coordinated to the oxidised forms of the ligand.
Citation of this paper:
Behnia, Ava and Boyle, Paul D. and Fard, Mahmood A. and Blacquiere, Johanna M. and Puddephatt, Richard J.,"Pincer-plus-one ligands in self-assembly with palladium(ii): a molecular square and a molecular tetrahedron,” Dalton Trans. 2016,4 5, 48, 19485-19490, The Royal Society of Chemistry