What kind of interactions we may get moving from zwitter to dritter ions: C-O⋯Re(O4) and Re-O⋯Re(O4) anion⋯anion interactions make structural difference between l-histidinium perrhenate and pertechnetate

L-Histidinium perrhenate was synthesized by the reaction of magnesium perrhenate with the corresponding nitrogenous base in hydrochloric acid. Pertechnetate was obtained from the nitrous base by reaction with pertechnetic acid. Their crystal structure was studied using single-crystal XRD and a comparative analysis of noncovalent interactions in the obtained structures was carried out. Pertechnetate is the second example of the combination of technetium with this amino acid, and both compounds described in this work are the first examples of structures of tetrahedral transition metal anions with histidine. The histidine molecules in the present structures are in the open conformation (1)(g-). Not onlyare nitrogen atoms of imidazole rings and amino groups involved in the formation of N-H & ctdot;Ot ypehydrogen bonds, but also CH group atoms form weaker C-H & ctdot;O type hydrogen bonds. His tidiniumperrhenate contains anion & ctdot;anion interactions, including those described for the first time: C-O & ctdot;Re(O-4)between the carboxyl group and the rhenium atom of the perrhenate anion. This type of interaction can be found (but was not discussed) in other Re and Mn compounds but is absent for Tc. Hirshfeld surfaceanalysis showed that the most important contribution to the packing organization is made by the O & ctdot;H/H & ctdot;O interaction for cations and anions.

Automated summary

L-Histidinium perrhenate and pertechnetate were synthesized and their crystal structures were studied. This work presents the first examples of tetrahedral transition metal anions with histidine and describes a new type of interaction between ions.