Interleaved and entangled divalent metal thiophenedicarboxylate coordination polymers with an extremely long-spanning and flexible dipyridylamide ligand

Divalent Metal 2,5‐Thiophenedicarboxylate Coordination Polymers with the Conformationally Flexible Bis(4‐pyridyl­formyl)homopiperazine Ligand

“…{[Cd(tdc)(4‐bpmp)(H 2 O)] · H 2 O} n [4‐bpmp = bis(4‐pyridylmethyl)piperazine] manifests (4,4) grid layers, but with less common 2D + 2D → 3D parallel entanglement 16. Employing the very long spanning dipyridylamide ligand propane‐1,3‐diylbis(piperidine‐4,1‐diyl))bis(pyridin‐4‐ylmethanone) (4‐ppbp) afforded [Ni(tdc)(4‐ppbp) 2 (H 2 O)] n , which possesses a polycatenated system of 2D + 2D → 2D parallel interpenetrated 2,6‐connected looped layers, derived from the edge‐crossed (4,4)IIb net 17…”

“…[11] In contrast to the more commonly used all-carbon ring aromatic dicarboxylates, fewer coordination polymers built from the aromatic ligand 2,5-thiophenedicarboxylate (tdc, Scheme 1) have been reported. [12][13][14][15][16][17] The tdc ligand is similar to isophthalate,but the five-membered thiophene ring orients…”

“…[16] Employing the very long spanning dipyridylamide ligand propane-1,3-diylbis(piperidine-4,1diyl))bis(pyridin-4-ylmethanone) (4-ppbp) afforded [Ni(tdc)(4ppbp) 2 (H 2 O)] n , which possesses a polycatenated system of 2D + 2D Ǟ 2D parallel interpenetrated 2,6-connected looped layers, derived from the edge-crossed (4,4)IIb net. [17] We thus endeavored to survey the scope of coordination polymers containing tdc and the previously unreported dipyridylamide ligand bis(4-pyridylformyl)homopiperazine (bpfh, Scheme 1). The bpfh ligand has a similar length to 4bpmp, but has hydrogen bonding capable amide groups and greater degrees of conformational freedom due to its central seven-membered homopiperazinyl ring.…”

Poly[(μ5-cis-cyclohex-4-ene-1,2-dicarboxylato)(μ3-cis-cyclohex-4-ene-1,2-dicarboxylato)dicadmium(II)]

“…The dipodal tethering ligand propane-1,3-diylbis(piperidine-4,1-diyl)bis(pyridin-4-ylmethanone (4-pbpp) has recently proven useful in preparing metal 1,3-thiophenedicarboxylate coordination polymers with intriguing and diverse interpenetrated topologies (Sample & LaDuca, 2016). The title compound was prepared during synthetic attempts to prepare cadmium coordination polymers containing both cis-cyclohex-4-ene-1,2-dicarboxylate (chedc) and 4-pbpp ligands.…”

Zinc and Cadmium Diphenate Coordination Polymers with Conformationally Flexible Dipyridylamide Ligands

“…Series of copper oxoanion or pseudohalide phases with bdin or pdin linkers were prepared by Biradha ,, and 1D or 2D copper isophthalate coordination polymers containing bdin tethers were reported by Lin et al The very long spanning dipyridylamide ligand propane‐1,3‐diylbis(piperidine‐4,1‐diyl))bis(pyridin‐4‐ylmethanone) (4‐ppbp) (Scheme ) has also been seldom used in supramolecular or coordination polymer chemistry. A very interesting topology was observed in [Ni(tdc)(4‐ppbp) 2 (H 2 O)] n , (tdc = 2,5‐thiophenedicarboxylate), which manifested a polycatenated system of 2D + 2D → 2D parallel interpenetrated 2,6‐connected looped layers . While less flexible, the dipyridylamide ligand 3‐pyridylisonicotinamide (3‐pna) (Scheme ) can show syn, anti , or intermediate twisted conformations of its pyridyl donor atoms …”