4.7 Article

Assembling and dissembling zinc-containing coordination polymers of 4 '-phenyl-4,2 ':6 ',4 ''-terpyridine

Journal

CRYSTENGCOMM
Volume 12, Issue 7, Pages 2146-2152

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/b926598h

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Funding

  1. Swiss National Science Foundation
  2. Swiss Nanosciences Institute
  3. NCCR in Nanoscale Science
  4. University of Basel

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The ligand 4'-phenyl-4,2':6',4 ''-terpyridine (3) reacts with Zn(OAc)(2)center dot 2H(2)O to yield the one-dimensional coordination polymer [Zn(2)(3)(OAc)(4)](n) or [Zn(3)(OAc)(2)](n) depending upon the reaction conditions. Both compounds have been structurally characterized. The former contains {Zn(2)(mu-OAc)(4)} units, pairs of which are connected by a bridging ligand 3, while the latter contains tetrahedral zinc(II) centres, each bonded to two terminal [OAc](-) ligands and two ligands 3. Both [Zn(2)(3)(OAc)(4)](n) and [Zn(3)(OAc)(2)](n) exhibit emissive behaviour in the solid state, the emissions being significantly enhanced with respect to non-coordinated ligand 3. Protonation of the coordination polymers produces a red shift in the emission maximum. However, treatment of [Zn(2)(3)(OAc)(4)](n) with MeI or EtI quenches the emission. This is a consequence of the coordination polymer being dismantled, Zn-N bonds are cleaved and the complexes [Me(2)(3)][ZnI(4)] and [Et(2)(3)][ZnI(4)] are formed. The direct reaction of 3 with an excess of MeI produces [Me(2)(3)]I(2) with N-methylation occurring at the two outer pyridine rings as observed in [Me(2)(3)][ZnI(4)].

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