S1 SUPPORTING INFORMATION Cu(I), Co(II) and Fe(II) coordination polymers with pyrazine and benzoate as ligands. Spin crossover, spin canting and metamagnetism phenomena Pilar Amo-Ochoa, a,* Oscar Castillo, b,* Félix Zamora a a Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid (Spain); b Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, E–48080 Bilbao (Spain). Contents: Figures S1-S3. Supramolecular crystal buildings of compounds 1-4. Tables S1-S2. Selected bond lengths and angles (Å,º) of compounds 1-4. Figures S4-S5. Thermogravimetric curves under synthetic air atmosphere of compounds 3-4. Figure S6. Field cooling (FC) and zero-field cooling (ZFC) magnetization curves for compound 3 under an applied magnetic field of 100 Oe. Description of the experimental procedure to obtain [Cu II 2 (Bz) 4 (pyz)] n complex. Electronic Supplementary Material (ESI) for Dalton Transactions This journal is © The Royal Society of Chemistry 2013