Cover Feature: (ChemPlusChem 5/2020)

Abstract

The Cover Feature shows a jigsaw with some of the structures discussed in this Minireview. This overview details two of the less‐explored arrangements of ligands around square‐planar metal ions, and how they can be used to assemble exciting metallosupramolecular architectures. The Lego bricks symbolize the construction of complex structures from simple componentry. More information can be found in the Minireview by D. Preston and P. Kruger (DOI: 10.1002/cplu.202000019). The authors thank the Lego Group for allowing them to include the bricks in this image.

A Catalogue of Orthogonal Complementary Ligand Pairings for Palladium(II) Complexes

“…[7] Considerable effort [8] has gone into the development of multicomponent assemblies, [9] including through 'coordination sphere engineering'. [10] Of particular relevance here are examples in which two ligands come together at a single metal ion: [11] in these cases the metal ion acts as a node bringing together two sites, which must exhibit complementarity towards each other. This complementarity could plausibly arise from: 1) Denticity.…”

Directing metallo-supramolecular assembly through complementarity

“…4). 42 In the case of a 3 : 1 combination, this by necessity will result in a heteroleptic coordination sphere. Complementary 3 : 1 environments have been integrated into larger systems consisting of a tridentate terpy site with neutral or anionic monodentate ligands, [43][44][45][46][47][48][49] or tris-amino tridentate sites and carboxylates 50,51 (Fig.…”

A Switchable Palladium(II) Trefoil Entangled Tetrahedron with Temperature Dependence and Concentration Independence

“…We used a core ligand scaffold consisting of a mono‐pyridyl arm and a tridentate site (Figure 1 top), analogous to our previously reported system that exhibited temperature‐ and concentration‐induced switching between metallo‐cyclic and catenated forms [17] . That scaffold had 3+1 complementarity [18] and so formed [Pd 2 L 2 ] 4+ macrocycles. The driving force for catenation in this previous work, like the vast majority of the examples given above as well as many other conformationally‐folded metallo‐structures, [19] was π–π interactions (and potentially solvophobicity).…”