Zn(ii) and Co(ii) coordination polymers based on semi-rigid bis-pyridyl-bis-amide and angular dicarboxylate ligands: synthesis, structures and properties

Venkatesan Lakshmanan, Chia Yi Lee, Yu Wen Tseng, Yu Hsiang Liu, Chia Her Lin*, Jhy Der Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Hydro(solvo)thermal reactions of N,N′-di(3-methylpyridyl)oxalamide (L1) and N,N′-di(4-methylpyridyl)oxalamide (L2) with angular dicarboxylic acids and Zn(ii) and Co(ii) metal salts afforded six coordination polymers (CPs), namely, [Zn(L1)0.5(FIPBB)·H2O]n [H2FIPBB = 4,4′-hexafluoroisopropylidenebis(benzoic acid)] (1), [Zn(L2)(OBA)·CH3OH]n [H2OBA = 4,4′-oxybis(benzoic acid)] (2), [Co(L2)0.5(FIPBB)·0.25CH3OH]n (3), [Co(L1)(OBA)·2H2O]n (4), [Co(L1)0.5(FIPBB)]n (5), and [Co2(L1)2(FIPBB)2(H2O)5·4H2O]n (6), which have been structurally characterized by using single-crystal X-ray diffraction. CPs 1 to 6 form a two-dimensional (2D) net with the bey, a polycatenated 2D net with the sql, a three-dimensional (3D) framework with the 6T9, a 2D net with the 3,5L2, 2D net with the bey and a one-dimensional (1D) looped chain with the 2,2,2,4C10 topologies, respectively. The distinct topological switch between 5 and 6 in the presence and absence of coordinated/cocrystallized water molecules was triggered under various temperatures through coordination and breakage of Co-O bonds. CPs 1 and 2 exhibit sustained porosities indicated by CO2 adsorption and exhibit high selectivity toward detection of pesticides such as 2,6-dichloro-4-nitroaniline (2,6-DCNA) and 4-nitroaniline (4-NA) with low detection limits and good recyclability up to five cycles. Integrating 1-octadecene with a long alkyl chain into 1-5 to modify the surface wettability induces hydrophobicity, which was verified by the measurement of water contact angles.

Original languageEnglish
Pages (from-to)6076-6086
Number of pages11
JournalCrystEngComm
Volume24
Issue number34
DOIs
Publication statusPublished - 2022 Aug 8

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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