SUPPORTING INFORMATION Synthesis and Structural Characterization of Tris(2-seleno-1- mesitylimidazolyl)hydroborato Complexes: A New Type of Strongly Electron Donating Tripodal Selenium Ligand Mao Minoura, Victoria K. Landry, Jonathan G. Melnick, Keliang Pang, Luciano Marchiò and Gerard Parkin,* Department of Chemistry, Columbia University, New York, New York 10027, USA. Received xxxx xx, 2006.