Bridging π-coordination of pyrrole and indole over a PdI–PdI bond

Abstract

π-Coordination of pyrrole or indole which lack a chelating functionality to a dinuclear Pd^I–Pd^I center is revealed. The dinuclear sandwich Pd^I–Pd^I complexes of pyrrole, N-methylpyrrole, or indole were synthesized and structurally characterized by X-ray crystallographic analysis. Indole employs the carbons of the six-membered ring in bridging π-coordination to a Pd^I–Pd^I center.