Structural evidence for the intramolecular charge-transfer interaction involving an indole ring in ternary copper(II) complexes with L-tryptophan and aromatic diamines
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Nippon Kagaku Kaishi
Cited by (87)
A rare diiodo-L-tyrosine copper(II) complexes – Crystal and molecular structure of materials stabilized by weak interactions
2022, PolyhedronCitation Excerpt :The frozen-solution EPR spectra of both complexes (Figure S4) are indicative of a dx2-y2 ground state (g||>g⊥) and thus suggest a dominantly normal tetragonal component in the solution stereochemistry [41]. Hyperfine parameters are the same for both complexes (g||= 2.243, A|| = 178 G, g⊥=2.057, A⊥=20 G) and represent typical values for the donor set N3O of the ligands in Cu(II) in the five-coordinated complexes [42]. The N, O atoms of l-I2TyrOH molecule together with N1, N2 atoms and Cl or OH2O atoms produced elongated square pyramidal (SP) environment around copper(II) ions with CuN2N’OCl (1) and CuN2NOO' (2) chromophores.
Synthesis, crystal structure, DNA interaction, DFT analysis and molecular docking studies of copper(ii) complexes with 1-methyl-L-tryptophan and phenanthroline units
2021, Journal of Molecular StructureCitation Excerpt :The fraction of unpaired electron density located on the copper ion i.e. the value in-plane sigma bonding parameter α2 (molecular orbital coefficient) was estimated from the expression, α2 = (A||/P) + (g|| – 2.0023) + 3/7 (g⊥ – 2.0023) + 0.04, (where A|| is the parallel coupling constant expressed in cm−1, and the value of P = 0.036). The α2 values for the copper(II) complexes found in the range 0.73–0.75, supported the covalent nature of these complexes [59]. The binding of present mixed-ligand copper(II) complexes (1–3) was investigated with CT–DNA in Tris–HCl/NaCl medium.
Ternary copper(II) complexes with 1,10‑phenanthroline and various aminoacidates: A spectroscopic and voltammetric study in aqueous solution
2019, Journal of Inorganic BiochemistryCitation Excerpt :As one can see form Table 3, the copper(II) ternary complexes with aromatic residues present a slightly more positive formal redox potential values than those with aliphatic residues. This small difference could be probably ascribed to weak interligand stacking interactions, which are known to be present in these systems [27,58]. Copper(II) ternary complexes with aminoacidate carrying positively charged residues also show more positive formal redox potentials.
The origin of enantioselectivity for intramolecular Friedel-Crafts reaction catalyzed by supramolecular Cu/DNA catalyst complex
2014, Chemical Physics LettersCitation Excerpt :In a very recent experimental study, Park et al. [11] reported the successful application of Cu/DNA based catalysts in a unimolecular Friedel–Crafts reaction (FC) by using a single reactant molecule with 2-acyl imidazole part, coordinating to Cu(II), and indole moiety (Scheme 1). This system provoked our interest due to the narrower range of possible initial configurations of the system, and the availability of some experimental information on the structure of similar metal complexes and their interaction with DNA [13,14]. Ternary Cu(II) amino-acid complexes were studied previously as DNA cleavage agents by combining experiment and docking simulation [13].