S1 SUPPORTING INFORMATION for Dehydration of Octacyanido-Bridged Ni II -W IV Framework toward Negative Thermal Expansion and Magneto-Colorimetric Switching Mateusz Reczyński, †,‡ Szymon Chorazy, †,‡ Beata Nowicka, † Barbara Sieklucka, *,† and Shin-ichi Ohkoshi *,‡ † Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland ‡ Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan S2 Table S1. Single-crystal data and structure refinement for 1 and 1d. S3 Table S2. Selected geometric parameters for 1 and 1d. S4 Table S3. SHAPE parameters for metal centers in 1 and 1d. Figure S1. Powder X-ray diffraction patterns in the representative range of 10–50º 2θ of the polycrystalline sample of 1. S5 Figure S2. Thermogravimetric analysis for 1. S6 Figure S3. The comparison of framework geometries for 1 and 1d with dehydration- induced structure transformation mechanism. S7 Figure S4. Thermal variation of anisotropic thermal elipsoids in 1d. S8 Table S4. Description and band assignment of the UV-Vis-NIR absorption spectra for 1, 1d and K 4 W[(CN) 8 ]∙2H 2 O. S9 Figure S5. The UV-Vis-NIR solid state absorption spectra of 1, 1d and K 4 [W(CN) 8 ]∙2H 2 O. Figure S6. The UV-Vis-NIR solid state absorption spectrum of K 4 [W(CN) 8 ]∙2H 2 O. S10 Figure S7. The field dependences of magnetization for 1 and 1d . S11 References