Crystal Structures of Two Luminescent Mononuclear and dinuclear cyclopalladated 2-(4-Ethylphenyl)pyrazine complexes.

Two mononuclear and dinuclear cyclopalladated 2-(4-ethylphenyl)pyrazine (epp) complexes <bold>2</bold> and <bold>3</bold> are prepared in the bridge-splitting reactions of palladacyclic dimer <bold>1</bold> with PPh₃ (<bold>2</bold>) and 1,4- bis(diphenylphosphino)butane (dppb) (<bold>3</bold>). Their crystal and molecular structures are determined by the single crystal X-ray analysis. C-H⋯N(Cl) hydrogen bonds and π⋯π interactions are found in the the crystals. [ABSTRACT FROM AUTHOR]