ESI – page 1 Synthesis and 1 H NMR studies of paramagnetic nickel(II) complexes containing bis(pyrazolyl)methane ligands with dendritic substituents. Alberto Sánchez-Méndez, Jose María Benito, Ernesto de Jesús,* F. Javier de la Mata, Juan C. Flores,* Rafael Gómez, and Pilar Gómez-Sal Departamento de Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares (Madrid), Spain. E-mail: juanc.flores@uah.es ; Fax: +34 91 885 4683; Tlf: +34 91 885 4607 ELECTRONIC SUPPLEMENTARY INFORMATION Figure S1. ESI-MS for ligand G3-CH(3,5-Me 2 pz) 2 (5): found and expected [M + H] + peak found calculated