Two star‐shaped molecules with benzene core and three naphthalene diimide (NDI) side arms were facilely prepared by two‐step imidization reaction from the 1,4,5,8‐naphthalenetetracarboxylic dianhydride. Two compounds showed the similar UV–vis absorption band as well as NDI. It was found that they displayed bathochromic shift of their UV–vis absorption and emission spectra in film compared with that in solution, ascribing to the aggregation between molecules in the solid state. Reversible reduction process was observed by cyclic voltammetry and low lying LUMO energy levels (−3.83 eV for 1a, −3.87 eV for 1b) were deduced, which suggest that these two compounds possessed good electron‐acceptor property and can be used as potential n‐type materials.
Treatment of AgNO 3 with a tetrazolyl ligand H 2 L 1 afforded a 3-D coordination polymer [Ag 2 (L 1 )] n (1). The crystal structure was determined by X-ray crystallography and it shows that both Ag1 and Ag2 atoms in the asymmetric unit exhibit distorted tetrahedron geometries, which are modified by AgAg interactions. The flexible methylene -CH 2linkage between tetrazolate and phenyl ring effectively reduces the steric strain in the resultant 3D-framework. L 1 exhibits an unsual coordination mode in which all nitrogen atoms in the two tetrazolato units are coordinated to the Ag I centers. The luminescent property of 1 was also investigated. It exhibits multiple emission bands; the high energy emission band is assigned to the ligand-centered π π transition, while the low energy emission bands are tentatively assigned to ligand-to-metal charge transfer (LMCT) that are modified by AgAg interaction. The independence of the chromaticity coordinates of 1 on the excitation wavelength also suggests that it is a potentially useful singlecomponent white-
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