4.6 Article

1D Zn(II) Coordination Polymers as Effective Heterogeneous Catalysts in Microwave-Assisted Single-Pot Deacetalization-Knoevenagel Tandem Reactions in Solvent-Free Conditions

Journal

CATALYSTS
Volume 11, Issue 1, Pages -

Publisher

MDPI
DOI: 10.3390/catal11010090

Keywords

coordination polymers; heterogeneous catalyst; tandem reactions; microwave; solvent-free

Funding

  1. Fundacao para a Ciencia e a Tecnologia (FCT), Portugal of Centro de Quimica Estrutural [UIDB/00100/2020]
  2. FCT [DL/57/2017, IST-ID/197/2019, IST-ID/107/2018]
  3. IST, Portugal [DL/57/2017, IST-ID/197/2019, IST-ID/107/2018]

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Two new 1D CPs have been prepared and characterized, showing potential as heterogeneous catalysts for tandem reactions under environmentally friendly conditions.
The new 1D CPs [Zn(L-1)(H2O)(4)](n).nH(2)O (1) and [Zn(L-2)(H2O)(2)](n) (2) [L-1 = 1,1 '-(ethane-1,2-diyl)bis(6-oxo-1,6-dihydropyridine-3-carboxylic acid); L-2 = 1,1 '-(propane-1,3-diyl)bis(6-oxo-1,6-dihydropyridine-3-carboxylic acid)] were prepared from flexible dicarboxylate pro-ligands (H2L1 and H2L2). Both CPs 1 and 2 were characterized by elemental, FTIR, and powder X-ray diffraction analysis. Their geometry and the structural features were unveiled by single-crystal X-ray diffraction analysis. The underlying topology of the CPs was illustrated by the topological analysis of the H-bonded structure of CP 1, which revealed a 3,4,6-connected trinodal net. On the other hand, topological analysis on the hydrogen-bonded network of CP 2 showed a 2,3,3,4,6,7-connected hexanodal net. The thermal stability of the CPs was investigated by thermogravimetric analysis. CPs 1 and 2 act as heterogeneous catalysts in one-pot tandem deacetalization-Knoevenagel condensation reactions under environmentally mild conditions. CPs 1 exhibits a yield of ca. 91% in a microwave-assisted solvent-free medium, whereas a slightly lower yield was obtained for CP 2 (87%) under the same experimental protocol. The recyclability of catalyst 1 was also assessed. To our knowledge, these are the first Zn(II)-based CPs to be applied as heterogeneous catalysts for the above tandem reactions under environmentally friendly conditions.

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