Naslov
Keggin-Type Anions as Halogen Bond Acceptors

Autori
Fotović, Luka ; Bedeković, Nikola ; Stilinović, Vladimir

Izvornik
Crystal growth & design (1528-7483) 23 (2023), 5; 3384-3392

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
crystal engineering ; halogen bonding ; polyoxometalate ; halogenopyridine cations

Sažetak
In order to study the potential of Keggin type polyoxometalate anions to act as halogen bond acceptors we have prepared a series of 10 halogen- bonded compounds starting from phosphomolybdic and phosphotungstic acid and halogenopyridinium cations as halogen (and hydrogen) bond donors. In all the structures the cations and the anions were interconnected by halogen bonds, more often with terminal M=O oxygen atoms than with bridging oxygen atoms as acceptors. In four structures comprising protonated iodopyridinium cations capable of forming both hydrogen and halogen bonds with the anion, the halogen bond with the anion is apparently favoured, while hydrogen bonds preferentially involve other acceptors present in the structure. In three obtained structures derived from phosphomolybdic acid, the corresponding oxoanion has been found in its reduced state [Mo12PO40]4–, which has also led to a decrease in halogen bond lengths as compared to the fully oxidated [Mo12PO40]3–. The electrostatic potential on the three types of anions involved in the study ([Mo12PO40]3–, [Mo12PO40]4–, [W12PO40]3–) has been calculated for optimised geometries of the anions, and it has shown that the terminal M=O oxygen atoms are the least negative sites of the anions, indicating they act as halogen bond acceptors primarily due to their steric availability.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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