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- W2781359670 abstract "Abstract Copper complexes of N,N,N′,N′-tetrakis(pyridyl-2-ylmethyl)-1,2-diaminoethane (L1) and N,N,N′,N′-tetrakis(pyridyl-2-ylmethyl)-1,3-diaminopropane (L2) prepared were characterized completely by different analytical methods. The X-structure of the complexes shows that Cu(II) presents in trigonal bi-pyramidal (TBP) geometry, consisting with the electronic spectra where two visible bands corresponding to five coordinated structure were observed. Thus TD-DFT was used to analyze the orbital contribution to the electronic transitions for the visible bands. Furthermore, the interaction of cysteine with the complexes was spectrally studied, and the results were explained through DFT analysis, observing that the geometrical parameters and oxidation state of metal ions play a vital role in the binding of cysteine with copper ion. It appears that the TBP structure is being changed into octahedral geometry during the addition of cysteine to the complexes as two bands (from complex) is turned to a broad band in visible region, signifying the occupation of cysteine molecule at sixth position of octahedral geometry. In the molecular orbital analysis, the existence of a strong overlapping of HOMOs (from cysteine) with LUMOs of Cu ion was observed. The total energy of the systems calculated by DFT shows that cysteine binds favorably with copper (I) than that with Cu(II)." @default.
- W2781359670 created "2018-01-05" @default.
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- W2781359670 date "2018-04-01" @default.
- W2781359670 modified "2023-10-03" @default.
- W2781359670 title "Structural influence in the interaction of cysteine with five coordinated copper complexes: Theoretical and experimental studies" @default.
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- W2781359670 doi "https://doi.org/10.1016/j.molstruc.2017.12.090" @default.
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