Amide-Driven Secondary Building Unit Structural Transformations between Zn(II) Coordination Polymers

Daniel Ejarque Granados, Maria Teresa Calvet Pallas, Mercè Font-Bardía, Josefina Pons Picart*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

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Abstract

The behavior of coordination polymers (CPs) against external stimuli has witnessed remarkable attention, especially when the resulting CPs present reversible molecular arrays. Accordingly, CPs with these characteristics can lead to differences in their properties owing to these structural differences, being promising for their use as potential molecular switches with diverse applications. Herein, we have synthesized four Zn(II) CPs bearing α-acetamidocinnamic acid (HACA) and 4,4′-bipyridine (4,4′-bipy). The reaction between Zn(OAc)2·2H2O, HACA, and 4,4′-bipy yields {[Zn(ACA)2(4,4′-bipy)]·EtOH}n (1), which was used for the formation of three CPs through dissolution-recrystallization structural transformations (DRSTs): {[Zn(ACA)2(4,4′-bipy)]·2MeOH}n (2), {[Zn2(μ-ACA)2(ACA)2(4,4′-bipy)]·2H2O}n (3), and {[Zn3(μ-ACA)6(4,4′-bipy)]·0.75CHCl3}n (4). The study of the four crystal structures revealed that their secondary building units (SBUs) comprise monomeric, dimeric, and trimeric arrangements linked by 4,4′-bipy ligands. The fundamental role of the utilized solvent and/or temperature, as well as their effect on the orientation of the amide moieties driving the formation of the different SBUs is discussed. Furthermore, the reversibility and interconversion between the four CPs have been assayed. Finally, their solid-state photoluminescence has evinced that the effect of the amide moieties not only predetermine a different SBU but also lead to a different emission in 4 compared with 1-3.

Original languageAmerican English
Pages (from-to)5012-5026
Number of pages15
JournalCrystal Growth and Design
Volume22
Issue number8
DOIs
Publication statusPublished - 13 Jul 2022

Keywords

  • COMPLEXES
  • DESIGN
  • DONOR LIGANDS
  • FLUORESCENCE
  • MAGNETIC-PROPERTIES
  • METAL-ORGANIC FRAMEWORKS
  • MOLECULES
  • PHARMACEUTICAL COCRYSTALS
  • POLYMERIZATION
  • SINGLE-CRYSTAL TRANSFORMATION

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