Structural influence of the length and functionality of N,N-donor spacers in Cd(II) ladder-type coordination polymers

Daniel Ejarque Granados, Teresa Calvet, Mercè Font-Bardia, Josefina Pons Picart*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)
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The understanding of the effect generated by small differences of the organic ligands on the molecular and supramolecular arrangement of coordination polymers (CPs) is a key factor to control their properties. Therefore, the study of structurally related ligands differing in some factors inter alia functional group orientation, length, or functionality is a crucial task for crystal engineers. In this contribution, the reactions between Cd(OAc) 2·2H 2O, α-acetamidocinnamic acid (HACA) and different N,N-donor spacers with increasing length (pyrazine, pyz; 4,4’-bipyridine, 4,4’-bipy; 1,2-bis(4-pyridyl)ethylene, 1,2-bpe), as well as additional functionalities (4,4’-azopyridine, 4,4’-azpy) have been successfully performed. Their crystal structures have been elucidated revealing a family of ladder-type 1D CPs showing molecular arrays with single pillars for {[Cd 2(μ-ACA) 2(ACA) 2(pyz)(H 2O) 2]·2EtOH} n (1), and double pillars for [Cd 2(μ-ACA) 2(ACA) 2(4,4’-bipy) 2] n (2), [Cd 2(μ-ACA) 2(ACA) 2(1,2-bpe) 2] n (3) and {[Cd 2(μ-ACA) 2(ACA) 2(4,4’-azpy) 2]·4,4’-azpy·9H 2O} n (4). Remarkably, the effect of the addition of the azo group in 4 compared with 2 and 3 has led to a CP with the same molecular arrangement but different crystal packing, allowing the introduction of one non-coordinated 4,4’-azpy and nine water molecules. Finally, their solid-state UV-Vis and photoluminescence have been measured observing their blue-emitting properties.

Original languageEnglish
Article number134896
Number of pages12
JournalJournal of Molecular Structure
Publication statusPublished - 5 Apr 2023


  • Cd(II) compounds
  • Ladder-type coordination polymers
  • N,N-donor linkers
  • Photophysical properties
  • Spacer length effect
  • X-ray crystal structure


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