Abstract
Di(2-pyridylmethyl)amine carboxylates with short alkyl linkers afford coordination polymers whereas the longer homologues favour macrocyclic topologies.
Highlights
Careful ligand design facilitates the desired propagation of metal–ligand units in coordination polymers
In light of the observations above, we have prepared a series of diIJ2-pyridylmethyl)amine-appended carboxylate ligands (Scheme 1) with an alkyl chain tether of variable length (n = 3–5, 7, 10, 11) as ligands to react with CuII and ZnII ions
Polymeric species are typically not detected by ESIMS due to low stability, steric constraints caused by the poly-methylene linkers while in solution may be a factor.[9]
Summary
Careful ligand design facilitates the desired propagation of metal–ligand units in coordination polymers. A well-known strategy is to design a bridging ligand with terminal X-donor atoms (typically X = N, O, P, S).[3] Ditopic bridging ligands containing terminal pyridine or carboxylate groups have been widely utilised as good candidates for the construction of coordination polymers due to the efficient coordination abilities of their multiple donor moieties.[4] In addition, CuII and ZnII ions are considered two of the most interesting divalent transition metals which can provide novel chemical and physical properties from a coordination perspective.[5] In light of the observations above, we have prepared a series of diIJ2-pyridylmethyl)amine-appended carboxylate ligands (Scheme 1) with an alkyl chain tether of variable length (n = 3–5, 7, 10, 11) as ligands to react with CuII and ZnII ions. The metal–ligand coordination ratios have been investigated by solution studies prior to growing crystals for solid-state characterisation
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