期刊
CHEMISTRYOPEN
卷 7, 期 11, 页码 865-877出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/open.201800170
关键词
condensation reactions; coordination polymers; heterogeneous catalysis; metallomacrocycles; O ligands
资金
- Foundation for Science and Technology (FCT), Portugal [UID/QUI/00100/2013, PTDC/QEQ-QIN/3967/2014]
- FCT [SFRH/BPD/76192/2011]
- CQE (Group 1) [RD0436-CC930204]
The reactions of 3,3 '-{(pyridine-2,6-dicarbonyl)bis(azanediyl)}dibenzoic acid (H2L) with zinc(II), cadmium(II), and samarium(III) nitrates were studied, and the obtained compounds, [Zn(1 kappa O:2 kappa O '-L)(H2O)(2)](n) (1), [Cd(1 kappa O-2:2 kappa O-2-L)(H2O)(2)](2)center dot 6n H2O center dot n C4H8O2 center dot 1.5n DMF (2), and [Sm(1 kappa O:2 kappa O ' O '':3 kappa O '''-L)(NO3)(H2O)(dmf)](n) n DMF (3), were characterized by elemental analysis, FTIR spectroscopy, thermogravimetric analysis, and X-ray single-crystal diffraction. Compounds 1 and 3 have 1D zigzag- and double-chain-type structures, respectively, whereas 2 features a dinuclear metallomacrocyclic complex. The ligand (L2-) orients in different conformations, that is, syn-syn for 1 and anti-anti for 2 and 3. Compound 1 is the first example in which the syn-syn conformation for this ligand has been observed. These compounds act as heterogeneous catalysts for the nitroaldol (Henry; in water medium) and Knoevenagel condensation reactions of different aldehydes, and the most effective is zinc coordination polymer 1. Recyclability, heterogeneity, and size-selectivity tests were performed, which showed that the catalyst was highly active over at least four recycling runs.
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