S1 Supporting Information for Structural Complexity in the Rare Earth Metallocene Hydride Complexes, [(C 5 Me 5 ) 2 LnH] 2 Shan-Shan Liu, †,‡ Song Gao, ‡ Joseph W. Ziller, † and William J. Evans † * † Department of Chemistry, University of California, Irvine, California 92697-2025, US and ‡ Beijing National Laboratory of Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China Email: wevans@uci.edu *To whom correspondence should be addressed. Table of Contents Page-S2: X-ray Data Collection, Structure Solution and Refinement for (C 5 Me 5 ) 2 Gd(-H) 2 Gd(C 5 Me 5 ) 2 , 1. Page-S2: X-ray Data Collection, Structure Solution and Refinement for (C 5 Me 5 ) 2 Tb(-H) 2 Tb(C 5 Me 5 ) 2 , 2. Page-S3: X-ray Data Collection, Structure Solution and Refinement for (C 5 Me 5 ) 2 Dy(-H)DyH(C 5 Me 5 ) 2 ·toluene, 3B. Page-S3: X-ray Data Collection, Structure Solution and Refinement for (C 5 Me 5 ) 2 Dy(-H)DyH(C 5 Me 5 ) 2 , 3C. Electronic Supplementary Material (ESI) for Dalton Transactions. This journal is © The Royal Society of Chemistry 2014