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(a) Displacement of an atom A from the center (centroid) of the tetrazine ring. (b) Frequency of shorter anion–ring contacts, for each anion, in the dcentroid versus doffset plane. (c) Frequency of all anion–ring contacts in the dcentroid versus doffset plane. Data from crystal structures of H2L12+ with PF6−, ClO4−; H2L22+ with HF2−, Cl−, Br−, I−, I3−, SCN−, NO3−, PF6−, ClO4−; H2L32+ with PF6−, ClO4−; H2L42+ with PF6−, ClO4− [8,9,10,11].
