A Hydroscopic Self‐Catenated Net Formed by Borromean Layers Interlocked by Ferrocenyl Bridging Ligands

Abstract

Reaction of a flexible tripodal ligand, 1,3,5-tris(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene (tttmb), and an organometallic carboxylate 1,1Ј-bis(3-carboxy-1-oxopropyl)ferrocene (H 2 bfcs) with Cd(Ac) 2 ·2H 2 O yields a trinodal, self-catenated 3D layer pillar complex {[Cd 3 (bfcs) 3 (tttmb) 2 (H 2 O) 4 ]· 8H 2 O} n (1), which is formed by connecting 2D hexagonal Cd II -tttmb Borromean layers through ferrocenyl bridges in

Self-Assembly and Host–Guest Interactions of Pd3L2 Metallo-cryptophanes with Photoisomerizable Ligands

“…Borromean rings are a type of topological entanglement in which three-ring structures cannot be separated without breaking a ring but there is no catenation or threading between the rings. Synthetic Borromean ring assemblies can be discrete ring assemblies or entangled networks of rings. − Assemblies with networks of infinite Borromean ring associations fall into two broad categories: infinite chainmail arrays of Borromean associations between discrete rings and Borromean entanglements of 2D networks. ,− Borromean entanglement of 2D networks has been reported for coordination polymers , and hydrogen-bonded, , halogen-bonded, and argentophilic networks. Borromean entanglement of 2D layers within a self-entangled 3D coordination polymer is also known .…”

“…Borromean entanglement of 2D layers within a self-entangled 3D coordination polymer is also known. 35 A majority of examples involve undulating 2D networks of 6 3 topology as shown here. Known onedimensional (1D) → 2D and 2D → 2D Borromean entanglements generally show 3-fold entanglement of networks.…”

Coordination assembly of Borromean structures

“…For example, by the solution reaction of a flexible tripodal ligand tttmb (1,3,5-tris(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene), a ferrocenyl bridging ligand H 2 bfcs (1,1′-bis(3-carboxy-1-oxopropyl)ferrocene) and Cd(Ac) 2 •2H 2 O salts under room temperature, a trinodal, self-catenated layer-pillaring complex {[Cd 3 (bfcs) 3 (tttmb) 2 (H 2 O) 4 ]•8H 2 O} n is obtained. 24 The complex shows a (6,3) hcb-net structure, in which the basic (ML) 6 type hexagonal ring is comprised of six tttmb ligands and six Cd II ions, serving as 3-connecting and 2-connecting nodes, respectively. In each layer, there are three identical Cd II -tttmb hcb-networks which are entangled in a Borromean-linking fashion.…”

“…A special example has been shown in the beginning of section 3.2.1. 24 In addition to the weak π-π interactions between the hcb-networks forming Borromean links, there are actually coordination interactions from bridging ferrocenyl carboxylate bfcs 2− . It should be noted that, Borromean topology is envisaged in this case by neglecting the coordination bonding through the bfcs 2− ligands.…”

Synthesis, crystal structure and biological properties of Cd and Zn coordination polymers based on a flexible tripodal ligand

“…Nitrogen-containing flexible ligands are used as an important class of bridging ligands in the synthesis of CPs due to their flexible and variable coordination configurations depending on the coordination environment (Ni et al, 2011;Meng et al, 2013;Shi et al, 2010;Xu et al, 2014). On the basis of the above considerations, we used a flexible compound with an aromatic core, namely 1,3,5-tris[(triazol-1-yl)methyl]-2,4,6trimethylbenzene (TTTMB), as a functional ligand to synthesize two new polymers, i.e.…”