4,4′-Dimethyl-2,2′-bithiazole: Potent co-former in coordination compounds

Diversity of Metal—Fullerene Framework Structures Regulated by Metal Salts

Taking into account the diversity of fullerene ligands and metal salts, metal–fullerene frameworks (MFFs) present a variety of structures. Currently, the structural control of MFFs mainly relies on the design and synthesis of fullerene ligands, while the influence of metal building units on the structures has been rarely studied. The present work represents a systematical investigation of fullerene-linked supramolecular architectures incorporating different metal salts. Treatment of a bidentate N,N-donors fullerene ligand (L1) with six metal salts ([Zn(NO₃)₂·6H₂O, Cd(NO₃)₂·4H₂O, Cu(NO₃)₂·3H₂O, Cu(OAc)₂·H₂O, FeCl₂·4H₂O and FeCl₃·6H₂O]) produced six one-dimensional MFFs, i.e., ZnL1(NO₃)₂(H₂O)₂ (1), CdL1(NO₃)₂ (2), Cu(L1)(H₂O)₂(NO₃)₂ (3), CuL1(OAc)(CH₃O) (4), FeL1Cl₂ (5) and FeL1Cl₂(FeCl₄) (6). Compounds 1–3, built with nitrates with different metal centers (M(NO₃)₂, M = Zn, Cd, Cu), present a 1D stair-like, 1D zigzag, and 1D linear chain structure, respectively. Compound 4, synthesized with another Cu(II) salt, Cu(OAc)₂, displays a dinuclear Cu-Cu connected 1D stair-like chain structure, rather than the single Cu linked 1D linear chain obtained from Cu(NO₃)₂. Compounds 5 and 6, assembled from iron chloride of different oxidation states (Fe(II)Cl₂ and Fe(III)Cl₃) reveal a 1D zigzag and a 1D stair-like chain structure, respectively. The results demonstrate the significant influences of metal salts on the structures of metal–fullerene frameworks.

The Early Years of 2,2'-Bipyridine-A Ligand in Its Own Lifetime

The first fifty years of the chemistry of 2,2′-bipyridine are reviewed from its first discovery in 1888 to the outbreak of the second global conflict in 1939. The coordination chemistry and analytical applications are described and placed in the context of the increasingly sophisticated methods of characterization which became available to the chemist in this time period. Many of the “simple” complexes of 2,2′-bipyridine reported in the early literature have been subsequently shown to have more complex structures.