1 Supporting Information: A Doubly Deprotonated Diimine Dioximate Metalloligand as a Synthon for Multimetallic Complex Assembly Danielle A. Henckel, Yuting F. Lin, Theresa M. McCormick,[b] Werner Kaminsky, and Brandi M. Cossairt*[a] [a] University of Washington, Department of Chemistry, Box 351700, Seattle, WA 98195-1700 [b] Portland State University, Department of Chemistry, Box 751, Portland, OR 97207 1. Additional Crystal Structures (Figures S1, S2, and Table S1) 2-3 2. Titration of 1 with ZnBr 2 (Figures S3-S5) 3-4 3. pK a Studies (Figures S6-S8) 5-7 4. Experimental and Computed UV-vis Data (Figure S9) 8 5. CVs of Complexes 1, 1-H + , 2, 3-M and 4 (Figures S10 – S18) 9-12 6. Electrocatalysis with 1, 1-H + , 2 and 4 (Figures S19 – S30 and Table S2) 13-19 7. Bulk Electrolysis (Figures S31 – S37 and Table S3 and S4) 20-26 8. DFT Calculation Details 27-34 9. 1 H NMR of Complexes 1, 1-H + , 2, 3-M (M=Cd, Mn, Zn) and 4 (Figures S38-S43) 35-37 10. UV-Vis Data for Complexes 3-M 38 11. X-ray Data (Tables S5-S14) 38-48 12. References 49 Electronic Supplementary Material (ESI) for Dalton Transactions. This journal is © The Royal Society of Chemistry 2015