Discovery of anion-anion interactions for pertechnetates and perrhenates

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The observed slight elongation of some Re/Tc-O bonds can beexplained by the participation of these oxygen atoms in ratherstrong or multiple H-bonds. Perrhenate and pertechnetate ionsare slightly distorted tetrahedra with nearly tetrahedral angles(Table S4-S6).Anion···anion interactions play an important role in all structures.The anions are interconnected by the weak Re···O interaction(Figure 2). The first anion (Re1) in I is associated with two otheranions (Figure 2a), and the second (Re2) with only one (Figure2b). The geometry of this interaction is slightly different for thetwo anions. The first perrhenate anions form a kind of double-lock. The angle Re1–O14···Re1i is 114.12º, and the angle Re2ii–O22ii···Re1 is 120.95º. The Re···O distance depends on the typeof interaction, for the double-lock interaction it is shorter(Re1···O14i distance is 3.241 Å and Re1··· O22ii is 3.317 Å). Instructures II and III, only the M···O interaction of the double-locktype between anions is formed (Figures 2b and 2c). (3) (PDF) Cation Protonation Degree Influence on the Formation of Anion⋅⋅⋅Anion and Other Non‐Valent Interactions in Guaninium Perrhenates and Pertechnetate. Available from: https://www.researchgate.net/publication/363305567_Cation_Protonation_Degree_Influence_on_the_Formation_of_AnionAnion_and_Other_Non-Valent_Interactions_in_Guaninium_Perrhenates_and_Pertechnetate [accessed Dec 12 2022].

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