IUPAC Recommendations: (Un)equivocal Understanding of Hydrogen and Halogen Bonds and Their (Un)equivocal Naming!
Elangannan Arunan, Pierangelo Metrangolo, Giuseppe Resnati, and Steve Scheiner
Cryst. Growth Des. 2024, 24, 20, 8153–8158
https://doi.org/10.1021/acs.cgd.4c00982
This manuscript shows that Si-H hydrogen acts as a donor of electron density to halogen atoms in Me3Si-H···Y complexes (Y = CF3I, BrCN), thus proving that, consistent with IUPAC definitions of hydrogen and halogen bonds, hydridic hydrogen functions as a halogen bond acceptor. This has been necessitated by a paper recently published asking whether the definition of hydrogen bonding should be revised to include hydridic H atoms acting as electron donors. The authors discuss the various nomenclatures used for referring to intermolecular/noncovalent bonds formed by various elements and point out the convention established in naming them by IUPAC, after long deliberations among the chemists from all over the world.
IUPAC has so far approved the definitions of hydrogen bond (https://doi.org/10.1351/PAC-REC-10-01-02), halogen bond (Group 17; https://doi.org/10.1351/PAC-REC-12-05-10), chalcogen bond (Group 16; https://doi.org/10.1515/pac-2018-0713), and pnictogen bond (Group 15; https://doi.org/10.1515/pac-2020-1002). As one can see, except for hydrogen bond, other names indicate a group of elements. Any proposed new name underwent a very rigorous process with multiple rounds of peer-review and involved the whole chemistry community being open for public comment before acceptance.
https://iupac.org/project/2016-001-2-300/ and former projects referred therein.
©2025 by IUPAC & De Gruyter
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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