The coordination chemistry of the pentadentate 2,2,6,6-tetrakis(aminomethyl)-4-azaheptane (ditame) by Hegetschweiler, K, Maas, O, Zimmer, A, Geue, R, Sargeson, A, Harmer, J, Schweiger, A, Buder, I, Schwitzgebel, G, Reiland, V, Frank, W