S1 Systematic investigation of trigonal-bipyramidal cyanide-bridged clusters of the first row transition metals Mikhail Shatruk, Kristen Chambers, Andrey V. Prosvirin, Kim R. Dunbar* Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012 RECEIVED DATE (automatically inserted by publisher); E-mail: dunbar@mail.chem.tamu.edu Supporting Information Page Preparation of compounds 1–9 ..................................................................................................... S2 Figure S1. Magnetic properties of compounds 1–3, 10, and 11 .................................................. S6 Figure S2. Additional fits of magnetic data for compound 5 ...................................................... S7 Figure S3. Field dependent magnetization for sample 7a............................................................ S8 Figure S4. Reduced magnetization for compound 9.................................................................... S8 Figure S5. Thermal ellipsoid plot of 1. ......................................................................................... S9 Figure S6. Thermal ellipsoid plot of 2. ....................................................................................... S10 Figure S7. Thermal ellipsoid plot of 3. ....................................................................................... S11 Figure S8. Thermal ellipsoid plot of 4. ....................................................................................... S12 Figure S9. Thermal ellipsoid plot of 5. ....................................................................................... S13 Figure S10. Thermal ellipsoid plot of 7. ..................................................................................... S14 Figure S11. Thermal ellipsoid plot of 8. ..................................................................................... S15 Figure S12. Thermal ellipsoid plot of 9. ..................................................................................... S16 Table S1. Metal-to-ligand bond distances (Å) in the crystal structures of compounds 1–9 ....... S17