Four‐, five‐ and six‐coordinated transition metal complexes based on naphthalimide Schiff base ligands: Synthesis,crystal structure and properties |
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| Authors: | Yuling Xu Han Zhang Kesheng Shen Shanshan Mao Xinkui Shi Huilu Wu |
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| Institution: | School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, People's Republic of China |
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| Abstract: | Two bidentate Schiff base ligands (HL1 = N‐n‐butyl‐4‐(E)‐2‐(((2‐aminoethyl)imino)methyl)phenol]‐1,8‐naphthalimide; and HL2 = N‐n‐butyl‐4‐(E)‐2‐(((2‐aminoethyl)imino)methyl)‐6‐methoxyphenol]‐1,8‐naphthalimide) with their metal complexes Cu(L1)2] ( 1 ), Zn(L1)2(Py)]2?H2O ( 2 ) and Ni(L2)2(DMF)2] ( 3 ) have been synthesized and characterized. Single‐crystal X‐ray structure analysis reveals that complex 1 has a four‐coordinated square geometry, while complex 2 is a five‐coordinated square pyramidal structure and complex 3 is a distorted six‐coordinated octahedral structure. Cyclic voltammograms of 1 indicate an irreversible Cu2+/Cu+ couple. In vitro antioxidant activity assay demonstrates that the ligands and the two complexes 1 and 3 display high scavenging activity against hydroxyl (HO?) and superoxide (O2??) radicals. Moreover, the fluorescence properties of the ligands and complexes 1 – 3 were studied in the solid state. Metal‐mediated enhancement is observed in 2 , whereas metal‐mediated fluorescence quenching occurs with 1 and 3 . |
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| Keywords: | antioxidant crystal structure fluorescence naphthalimide Schiff base transition metal complexes |
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