Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation
The {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) (H2Tae = 1,1,2,2-tetraacetylethane, 4,4′-Bpy = 4,4′-Dipyridyl) 1D coordination polymer has been obtained by slow evaporation. The crystal structure consists of parallel and oblique {Cu(HTae)(4,4′-Bpy)} zig-zag metal–organic chains stacked along the [100] crystallog...
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doaj-881e44f010d04a549f2d420ec160e64d2020-11-24T21:00:04ZengMDPI AGMolecules1420-30492016-12-012112165110.3390/molecules21121651molecules21121651Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel CondensationEdurne S. Larrea0Roberto Fernández de Luis1María I. Arriortua2Department Mineralogía y Petrología, Universidad del País Vasco, UPV/EHU, Sarriena s/n, 48940 Leioa, SpainBCMaterials (Basque Center for Materials, Applications & Nanostructures), Technological Park of Zamudio, Camino de Ibaizabal, Bndg. 500-1st, 48160 Derio, SpainDepartment Mineralogía y Petrología, Universidad del País Vasco, UPV/EHU, Sarriena s/n, 48940 Leioa, SpainThe {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) (H2Tae = 1,1,2,2-tetraacetylethane, 4,4′-Bpy = 4,4′-Dipyridyl) 1D coordination polymer has been obtained by slow evaporation. The crystal structure consists of parallel and oblique {Cu(HTae)(4,4′-Bpy)} zig-zag metal–organic chains stacked along the [100] crystallographic direction. Copper(II) ions are in octahedral coordination environment linked to two nitrogen atoms of two bridging 4,4′-Bpy and to two oxygen atoms of one HTae molecule in the equatorial plane. The occupation of the axial positions varies from one copper atom to another, with different combinations of water molecules and nitrate anions, giving rise to a commensurate super-structure. By means of the thermal removal of water molecules, copper coordinatively unsaturated centres are obtained. These open metal sites could act as Lewis acid active sites in several heterogeneous catalytic reactions. The dehydrated compound, CuHTaeBpy_HT, has been tested as a heterogeneous recoverable catalyst for Knoevenagel condensation reactions. The catalyst is active and heterogeneous for the condensation of aldehydes with malononitrile at 60 °C using a molar ratio catalyst:substrate of 3 % and toluene as solvent. The catalyst suffers a partial loss of activity when reusing it, but can be reused at least four times.http://www.mdpi.com/1420-3049/21/12/1651coordination polymerheterogeneous catalysisKnoevenagel condensation |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Edurne S. Larrea Roberto Fernández de Luis María I. Arriortua |
spellingShingle |
Edurne S. Larrea Roberto Fernández de Luis María I. Arriortua Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation Molecules coordination polymer heterogeneous catalysis Knoevenagel condensation |
author_facet |
Edurne S. Larrea Roberto Fernández de Luis María I. Arriortua |
author_sort |
Edurne S. Larrea |
title |
Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation |
title_short |
Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation |
title_full |
Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation |
title_fullStr |
Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation |
title_full_unstemmed |
Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation |
title_sort |
catalytic performance of a new 1d cu(ii) coordination polymer {cu(no3)(h2o)}(htae)(4,4′-bpy) for knoevenagel condensation |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2016-12-01 |
description |
The {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) (H2Tae = 1,1,2,2-tetraacetylethane, 4,4′-Bpy = 4,4′-Dipyridyl) 1D coordination polymer has been obtained by slow evaporation. The crystal structure consists of parallel and oblique {Cu(HTae)(4,4′-Bpy)} zig-zag metal–organic chains stacked along the [100] crystallographic direction. Copper(II) ions are in octahedral coordination environment linked to two nitrogen atoms of two bridging 4,4′-Bpy and to two oxygen atoms of one HTae molecule in the equatorial plane. The occupation of the axial positions varies from one copper atom to another, with different combinations of water molecules and nitrate anions, giving rise to a commensurate super-structure. By means of the thermal removal of water molecules, copper coordinatively unsaturated centres are obtained. These open metal sites could act as Lewis acid active sites in several heterogeneous catalytic reactions. The dehydrated compound, CuHTaeBpy_HT, has been tested as a heterogeneous recoverable catalyst for Knoevenagel condensation reactions. The catalyst is active and heterogeneous for the condensation of aldehydes with malononitrile at 60 °C using a molar ratio catalyst:substrate of 3 % and toluene as solvent. The catalyst suffers a partial loss of activity when reusing it, but can be reused at least four times. |
topic |
coordination polymer heterogeneous catalysis Knoevenagel condensation |
url |
http://www.mdpi.com/1420-3049/21/12/1651 |
work_keys_str_mv |
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