Discrete and Polymeric Self‐Assembled Palladium(II) Complexes as Supramolecular Gelators

Abstract

Supramolecular gels prepared from low-molecular-weight gelators have been extensively explored. However, the exploitation of discrete or polymeric metal complexes as gelators is a relatively recent trend. The synthesis of self-assembled coordination complexes from palladium(II) and selected ligands is well established, but the potential of these complexes as gelators is a less explored treasure. Herein we focus on the gelation abilities of some self-assembled palladium(II) complexes and the resulting unique properties. First, discrete complexes with PdL, PdL , Pd L, Pd L , Pd L , and Pd L compositions are discussed. Second, gelation behavior promoted by coordination-polymer-like gelators formed in situ is explored. These gel samples have been employed in catalysis and the uptake of organic and dye molecules from the solution and gas phases. It is concluded that untapped unique properties can be realized by further exploration of designer palladium(II) complexes.

A New Mechanically‐Interlocked [Pd2L4] Cage Motif by Dimerization of two Peptide‐based Lemniscates

“…As for members of the group with lowest nuclearity [Pd 2 L 4 ], a large variety of the topologically most simple lantern‐shaped cages (Figure 1 a) were reported by Steel, [3b] Fujita, [12] Yoshizawa, [13] Chand, [3e, 14] Crowley, [3f, 15] our group [8, 16] and others [17] . Recently, we introduced the first example of a self‐penetrating [Pd 2 L 4 ] topology, albeit composed of two different ligands in a heteroleptic fashion (Figure 1 b).…”

Conjoined and non-conjoined coordination cages with palladium(ii) vertices: structural diversity, solution dynamics, and intermolecular interactions

“…The gels obtained from discrete Pd( ii ) based self-assemblies include mononuclear, binuclear, trinuclear, and dodecanuclear complexes. 110…”

“…The gels obtained from discrete Pd(II) based self-assemblies include mononuclear, binuclear, trinuclear, and dodecanuclear complexes. 110 The fine tuning of the required conditions can facilitate the formation of gel. Chand and co-workers observed the gel formation from the solution of an in situ prepared discrete Pd 3 L 6 type complex, [Pd 3 (L21) 6 ](NO 3 ) 6 , 26 crafted with benzimidazole functionalized ligands above a critical concentration (20 mM corresponding to Pd(II) units) of reactants.…”

Ein neues, mechanisch verzahntes [Pd2L4] Käfigmotiv durch Dimerisierung von zwei Peptid‐basierten Lemniskaten

“…In der Gruppe der Verbindungen mit der geringsten Nuklearität, [Pd 2 L 4 ], wurde eine große Anzahl an topologisch trivialen, laternenförmigen Käfigen (Abbildung 1 a) von Steel, [3b] Fujita, [12] Yoshizawa, [13] Chand, [3e, 14] Crowley, [3f, 15] unserer Gruppe [8, 16] und weiteren Autoren veröffentlicht [17] . Vor kurzem haben wir das erste Beispiel einer sich selbst durchdringenden [Pd 2 L 4 ]‐Topologie vorgestellt, allerdings auf Basis eines heteroleptischen Käfigs, bestehend aus zwei verschiedenen Liganden (Abbildung 1 b).…”