Abstract
A pyrene-based new ligand (1) attaching hydroxyl and imine group, i.e., a salicylaldimine-style ligand based on pyrene, was designed and synthesized. The ligand was prepared from the commercially available pyrene in five steps. A treatment of this ligand 1 (L) with Pt(II)Cl2(PhCN)2 in the presence of AcONa in PhCl afforded the corresponding metal complex, Pt(II)L2 (2) (80%). Single crystal diffraction study revealed that the complex is a square planar four-coordinated platinum(II) complex. The ligands bind to the metal in trans-manner. The coordination geometry, i.e., bond distances and angles for the coordination site, is the typical of the reported platinum(II) salicylaldiminatos, e.g., the mean Pt–N distance (d(Pt–N)): 2.011 and d(Pt–O): 1.994Å, respectively. The expansion of the π-system of the ligand induces the bathochromic shift in absorption spectra. The lowest excitation energy of 2 was found at 520nm. Theoretical studies suggest that this phenomenon is attributable to the narrowing intramolecular HOMO–LUMO gap of 2.
Published Version
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