Abstract
Four oxovanadium(IV) complexes, namely [VO(desa-met)(phen)]·MeOH·2H2O (1) (desa-met = Schiff base derived from 4-(diethylamino)salicylaldehyde and dl-methionine, phen = 1,10-phenanthroline), [VO(o-van-met) (phen)]·MeOH·CH2Cl2·3H2O (2) (o-van-met = Schiff base derived from o-vanillin and dl-methionine), [VO(dtbs-napa)(phen)]·2H2O (3) (dtbs-napa = Schiff base derived from 3,5-di-tert-butyl salicylaldehyde and 3-(1-naphthyl)-l-alanine) and [VO(hyna-napa)(phen)]·1.5H2O (4) (hyna-napa = Schiff base derived from 2-hydroxy-1-naphthaldehyde and 3-(1-naphthyl)-l-alanine), were synthesized and characterized by IR, HRMS, UV–vis spectra, molar conductance and single-crystal X-ray diffraction (XRD). X-ray structural analysis showed that the V(IV) atoms in all four complexes are six-coordinated in a distorted octahedral environment. In the crystals of complexes 1 and 2, π–π stacking interactions together with hydrogen bonds connect the molecular units into 2D networks. Meanwhile, CH–π stacking interactions are observed between the aromatic rings in the crystals of 1 and 4, while the π–π stacking interactions between aromatic rings in the crystals of 2 and 3 are arranged with a face-to-face mode. The in vitro anticancer activities of these complexes against A-549 and HeGp2 cells were tested by MTT assay.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (81360471), the International Cooperation Project of Guizhou Province (No. [2012]7036), Science and the ‘Chunhui’ plan project of Ministry of Education (No. Z2014089) and the National Project of Training Programs of Innovation and Entrepreneurship for Undergraduates, China (No. 201510661007).
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Cao, Y., Yi, C., Liu, H. et al. Syntheses, crystal structures and in vitro anticancer activities of oxovanadium(IV) complexes of amino acid Schiff base and 1,10-phenanthroline ligands. Transit Met Chem 41, 531–538 (2016). https://doi.org/10.1007/s11243-016-0049-0
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DOI: https://doi.org/10.1007/s11243-016-0049-0