Synthesis of a new azulene based ligand and its complexation with Gold (Ⅰ) center

Nonalternant hydrocarbons, consisting of organic conjugated hydrocarbons with odd membered carbon cycles, exhibit chemical and physical properties different from alternant hydrocarbons. Among the nonalternant hydrocarbons, azulene and its derivatives has received considerable attention from both a theoretical and experimental point of view [1]. Although azulene is an isomer of naphthalene and like naphthalene has a bicyclic unsaturated structure, it differs greatly in its properties from aromatic molecules built up from six membered rings. It has a blue color, large dipole moment and the best known example of a molecule that does not obey Kasha’s Rule [2]. In this work the azulene derivative 1 has been prepared from reaction of 6-methyl azulene with B2Pin2[ Bis(pinacolato) diboron]and then C-C bond coupling of 1 and 2-bromo pyridine in the presence of Palladium catalyst [ PdCl2(PPh3)2] affords the new azulene ligand 2. Ligand 2 characterized using 1&2D NMR spectroscopy. Ligand 2 characterized using 1&2D NMR spectroscopy.