X-ray Crystal Structures of Discrete and Polymeric Silver Based Molecules Containing 4,4′-Dimethyl-2,2′-Bipyridine and 2,2′-Bipyridine

A new polymeric complex of silver(i) with a hybrid pyrazine–bipyridine ligand – synthesis, crystal structure and its photocatalytic activity

“…Metal-directed self-assembly is a powerful synthetic methodology for supramolecular architectures that may exhibit novel physicalchemical properties 1 because of the possibility of their application in many areas, such as medicine, 2 photosensors, 3 catalysis, 4 photocatalysis 5 and technology. 6 Silver(I) ions show a tendency to form metal-metal interactions 7,8 and they are able to have different coordination numbers and geometries (linear, trigonal, tetrahedral, square planar and square pyramidal). This variety is in part due to the lack of stereochemical preference that arises from a d 10 configuration.…”

Dynamic Transformation of a Ag+-Coordinated Supramolecular Nanostructure from a 1D Needle to a 1D Helical Tube via a 2D Ribbon Accompanying the Conversion of Complex Structures

“…As this 3:2 complex featured a Ag + −Ag + interaction and a helical structure. 60,64,65 We expect that each Ag + ion was coordinated by three nitrogen atoms of three Bipy molecules (1G). The large upfield shift was ascribed to strong π−π stacking between Bipy moieties.…”

“…As bipyridine-based ligands can form a variety of complexes with Ag + , e.g., those with 1G :Ag + molar ratios of 1:1, 2:1, and 3:2, − we first observed changes in the nuclear magnetic resonance (NMR) signals of aromatic protons upon the addition of Ag + (0–3.0 equiv) to find the optimal conditions for 3:2 and 1:1 complex formation (Figure S1). The signal of H 1,2 shifted upfield until the addition of 0.7 equiv of Ag + , with no large changes were observed at 0.7–1.2 equiv of Ag + , which indicated that the 3:2 1G :Ag + complex was the thermo­dynamic product in the presence of 0.7–1.2 equiv of Ag + .…”

“…Ligand 1R , which lacks a glycine moiety, was also prepared as a reference ligand (Scheme S2). The Ag + ion was chosen as a guest ion since it allows the formation of a variety of coordination geometries, such as linear, triangular, square planar, and tetrahedral structures with different coordination numbers. − Indeed, Ag–Ag interactions not only induce helical structures in complexes but also act as additional driving forces for the formation of metallo-supra­molecular nano­structures. Thus, we herein report a dynamic morphological transformation from a 1D needle-like structure to a 1D helical tubular structure with P -helicity via a 2D ribbon of the 1G ligand in the presence of 1.0 equiv of AgNO 3 in an aqueous solution to represent the first example of a dynamic morphology transformation in metallo-supra­molecular nano­structures.…”

Supramolecular assembly of a dinuclear Ag(I) complex with discreet Ag2S2 centers

“…Silver(I) compounds with multidentate ligands have received much attention due to their ability to self-assemble as coordination polymers through non-covalent interactions [1][2][3][4][5][6][7][8][9]. The ability of Ag(I) to adopt numerous coordination environments coupled with ligands that incorporate hydrogen-bond donors/acceptors and/or p-p interactions provides an avenue for the formation of a collection of extended network solids.…”