Facile microwave synthesis, structural diversity and herbicidal activity of six novel alkaline-earth metal complexes (AECs) based on skeletal isomerization chlorophenoxyacetic acids
Autor: | Qi Shuai, Xiu ling Xu, Fan Hu, Yuwei Ma, Jin-Ming Gao |
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Rok vydání: | 2018 |
Předmět: |
Thermogravimetric analysis
Alkaline earth metal Chemistry Infrared 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Metal Field emission microscopy Crystallography visual_art Materials Chemistry visual_art.visual_art_medium Elongation 0210 nano-technology Isomerization Microwave |
Zdroj: | New Journal of Chemistry. 42:4155-4166 |
ISSN: | 1369-9261 1144-0546 |
DOI: | 10.1039/c8nj00107c |
Popis: | Six novel AECs of [Sr(o-CPA)2(H2O)4]·(o-CPA) 1, [Ba(o-CPA)2(H2O)]·H2O 2, [Sr(m-CPA)2(H2O)4]·(m-CPA) 3, [Ba(m-CPA)2(H2O)4]2·2(m-CPA)·H2O 4, [Sr(p-CPA)2(H2O)] 5 and [Ba(p-CPA)2(H2O)] 6 (o-CPA = 2-chlorophenoxyacetic acid, m-CPA = 3-chlorophenoxyacetic acid and p-CPA = 4-chlorophenoxyacetic acid) were synthesized by a facile microwave-assistant reaction. The solid-state structures were well established by X-ray crystallography and routine analyses of Fourier transform infrared, elemental analysis, field emission scanning electron microscope (FESEM) and thermogravimetric analysis. The structure data reveal that complexes of 1, 3 and 4 are one-dimensional chains with a zigzag arrangement, while 2, 5 and 6 are (4, 4) rhomboid two-dimensional grid structures. It is noticed that the carboxyl group in these complexes displays multiple coordination modes of μ2-η1:η1 (1, 2, 3, 4, 5 and 6), μ3-η1:η2 (1, 2, 3 and 4), μ2-η1:η2 (2), μ3-η2:η2 (5 and 6). Interestingly, the oxygen atoms of flexible –OCH2– in phenoxy groups take part in coordination behavior with metal centers through the rotation of the C–O and C–C bonds in complexes 2, 5 and 6, while only carboxyl group coordination can be found in complexes 1, 3 and 4. FESEM images indicate that the surface appearances of complexes are totally different from ligands after coordination. All ligands and complexes were evaluated for activity as plant-growth inhibitors against Amaranth (Amaranthus spp.) and barnyard grass. Compared with ligands, complexes 1, 3 and 4 exhibited better response index (RI) values of Shoot elongation against barnyard grass. Moreover, complexes 1, 3 and 4 demonstrated a higher inhibitory activity than 2, 5 and 6. It is significant to develop a new kind of environmentally-friendly herbicide based on these kinds of complexes for their low toxicity and high efficiency. |
Databáze: | OpenAIRE |
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