A redetermination of (N⁹-adenine-κN)aqua[glycylglycinato(2−)-κ³N,N′,O]copper(II)

Abstract

In the title complex, [Cu(C4H6N2O3)(C5H5N5)(H2O)], the CuII atom is five‐coordinated in a square‐pyramidal geometry by a tridentate glycylglycinate ligand (glygly), an N atom from an adenine ligand (Hade) and a water molecule in the apical position. The Hade coordination is reinforced by an intramolecular hydrogen‐bonding interaction. A much lower precision structure has already been determined using intensities collected by the film method [Tomita, Izumo & Fujiwara (1973). Biochem. Biophys. Res. Commun. 54, 96–99].

On the Use of Q-Band Double Electron–Electron Resonance To Resolve the Relative Orientations of Two Double Histidine-Bound Cu2+ Ions in a Protein

“…43 This tetramutant was crystallized in the absence of Cu 2+ . We placed Cu 2+ ions in the structure in silico and positioned them with respect to the histidines based on the structure of a Cu 2+ ion coordinated to two imidazole ligands 91 as was done previously. 43 Figure 5 shows this structure.…”

Metal ion binding patterns of acyclovir: Molecular recognition between this antiviral agent and copper(II) chelates with iminodiacetate or glycylglycinate

“…[33][34][35][36][37] the strategies of the synthesis here reported are designed on the basis of obtaining suitable copper (II) chelates by reactions of the basic copper(II) carbonate and the corresponding chelating ligand in their free-acid forms. Reactions (a) and (b) yield the copper(II) chelates of IDA and glygly respectively.…”

A Tetranuclear CuII-Based 2D Aggregate with an Unprecedented Tetradentate μ4-N1,N3,N7,N9-Adeninate Nucleobase

“…The interactions of nucleic acids or their constituents with metal ions have currently received intense interest owing not only to the biological importance of the metal−nucleobase bonds, the functions of nucleic acids, and genetic information transfer but also to their structural diversity, molecular recognition behaviors, and potential applications as advanced functional materials. − Native adenine (Hade) nucleobase with considerable water solubility and five possible donor sites (the endocyclic N1, N3, N7, and N9 and exocyclic N6 atoms) has already exhibited the widest range of binding possibilities including monodentate N9, − N7, ,, and N3 ,, bidentate bridging and/or chelating μ 2 -N7,N9, − μ 2 -N3,N9, μ 2 -N3,N7, μ 2 -N1,N9, and μ 2 -N6,N7 as well as tridentate μ 3 -N3,N7,N9 ,, modes, which depend essentially on the properties of the metal ion (main group or transition metal, charge, d-electron configuration, and hard- or softness), the nature of the Hade nucleobase (the basicity of the N-donor site, the degree of protonation, as well as the different tautomeric forms), and, sometimes, the auxiliary ligands that complete the metal coordination sphere. , However, the polymeric structures bridged by Hade are relatively uncommon. − ,,, Especially, the discrete/polymeric Hade-based metal complex, in which the unsubstituted Hade ligand binds the metal ion either by its individual N1 site or by combinations of N1 with more other two N donors, has never been observed by far, although it is reasonable in principle . On the other hand, in addition to the classical coordination bonds, the presence of a primary 6-amino group in Hade also offers interesting possibilities for acting as an H donor in interligand hydrogen-bonding interactions, which cooperates with the coordination bonds to stabilize and/or extend the resulting complexes into higher dimensional architectures .…”