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Palladium(II) Based Self-assembled Heteroleptic Coordination Architectures: A Growing Family.

Metal-driven self-assembly has been one of the most effective approaches to lucidly design a large range of discrete 2-D and 3-D coordination architectures/complexes. Palladium(II) based self-assembled coordination architectures are usually prepared using suitable metal components taken either in a partially protected form (PdL') or bare usual form (Pd), (charges are not shown), and designer designed ligand components. The self-assembled molecules that are prepared by using a metal component and only one type of non-chelating bi or polydentate ligands (L) can be classified under homoleptic series of complexes. On the other hand the less explored heteroleptic series of complexes are obtained by using a metal component and at least two diﬀerent types of non-chelating bi or polydentate ligands (such as La and Lb). Methods that allow the controlled generation of single-discrete heteroleptic complexes are less understood. We made a survey of palladium(II) based self-assembled coordination cages that are heteroleptic. This review article illustrates systematic collection of such architectures, and credible justification of their formation followed by functional aspects of the complexes if any. The collected heteroleptic assemblies are classified here into three sections: (i) [(PdL')m(La)x(Lb)y] type complexes where denticity of La and Lb is equal; (ii) [(PdL')m(La)x(Lb)y] type complexes where denticity of La and Lb is different; and (iii) [Pdm(La)x(Lb)y] type complexes where denticity of La and Lb is equal. Representative examples classical of some of the important homoleptic architectures are also provided, wherever possible, to set a background for better understanding of the related heteroleptic versions. The purpose of this review is to pave the way for the construction of several unique heteroleptic coordination assemblies that might exhibit emergent supramolecular functions.