Custom coordination environments for lanthanoids: tripodal ligands achieve near-perfect octahedral coordination for two dysprosium-based molecular nanomagnets by Lim, KS, Baldoví, JJ, Jiang, S, Koo, BH, Kang, DW, Lee, WR, Koh, EK, Gaita-Ariño, A, Coronado, E, Slota, M, Bogani, L, Hong, CS