Anticooperativity of Multiple Halogen Bonds and Its Effect on Stoichiometry of Cocrystals of Perfluorinated Iodobenzenes

Bedeković, Nikola; Piteša, Tomislav; Eraković, Mihael; Stilinović, Vladimir; Cinčić, Dominik (2022) Anticooperativity of Multiple Halogen Bonds and Its Effect on Stoichiometry of Cocrystals of Perfluorinated Iodobenzenes. Crystal Growth & Design, 22 (4). pp. 2644-2653. ISSN 1528-7483

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Abstract

To investigate influences on the topicity of perfluorinated halobenzenes as halogen bond (XB) donors in the solid state, we have conducted a database survey and prepared 18 novel cocrystals of potentially ditopic (13ditfb, 14ditfb) and tritopic (135titfb) XB donors with 15 monotopic pyridines. 135titfb shows high tendency to be mono- or ditopic, but with strong bases it can act as a tritopic XB donor. DFT calculations have shown that binding of a single acceptor molecule on one of the iodine atoms of the XB donor reduces the ESPmax on the remaining iodine atoms and dramatically decreases their potential for forming further halogen bonds, which explains both the high occurrence of crystal structures where the donors do not achieve their maximal topicity and the observed differences in halogen bond lengths. Despite the fact that this effect increases with the basicity of the acceptor, when the increase of halogen bond energy due to the basicity of the acceptor compensates its decrease due to the reduction of the acidity of the donor, it enables strong bases to form cocrystals in which a potentially polytopic XB donor achieves its maximal topicity.

Item Type:	Article
Uncontrolled Keywords:	hydrogen-bond; isostructural materials; solid-state; cooperativity; donors; competition; frameworks; complexes; exchange; modules
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Division of Physical Chemistry
Projects:	Project title Project leader Project code Project type Centar izvrsnosti u kemiji - CIuK-CIuK Josip Požar; Mirta Rubčić; Ivana Biljan KK.01.1.1.02.0016 EK Nove građevne jedinke u supramolekulskom dizajnu složenih višekomponentnih molekulskih kristala temeljenih na halogenskim vezama-HaloBond Dominik Cinčić IP-2019-04-1868 HRZZ
Depositing User:	Ema Buhin Šaler
Date Deposited:	15 May 2026 11:42
URI:	https://fulir.irb.hr:/id/eprint/11959
DOI:	10.1021/acs.cgd.2c00077

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