Halogen Bonding in Halothiophene Building Blocks
Koivuporras, A., Mailman, A., Guo, H., Priimagi, A., & Puttreddy, R. (2023). Halogen Bonding in Halothiophene Building Blocks. Crystal Growth and Design, Early online. https://doi.org/10.1021/acs.cgd.3c00958
Published inCrystal Growth and Design
© 2023 the Authors
Thiophenes bearing monotopic and symmetric ditopic halogen substituents and asymmetric ditopic halogen and pyridine substituents that act as halogen bond acceptors were evaluated for their halogen bonding interactions with 1,4-diiodotetrafluorobenzene and N-iodosuccinimide. The combinations resulted in C/N–I···X′ (X′ = Cl, Br, I) and C/N–I···NPy (Py = pyridine) interactions, the former characterized by an interaction energy (ΔEint) ranging from −4.4 to −18.7 kJ mol–1 and the latter from −26.3 to −56.0 kJ mol–1. X-ray crystallography studies show that the ditopic asymmetric systems consisting of both halogens and pyridine self-associate through C–X···NPy (X = Cl, Br, I) halogen bonding, and in their optimized structures the energies range from −5.4 to −19.6 kJ mol–1 depending on the type of halogen atom present. The 1H NMR association constants of N–I···NPy halogen bonds range between 1405 and 6397 M–1. The σ-hole strengths of halogens have been useful in describing the interaction energies and solution models. ...
PublisherAmerican Chemical Society (ACS)
Publication in research information system
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Additional information about fundingThe authors gratefully acknowledge financial support from the Academy of Finland (SUPREL project, No.326416 for A.P. and Postdoctoral Fellowship, No. 347201, for H.G.). The work is conducted as part of the Academy of Finland Center of Excellence Programme LIBER, No. 346107 and the Flagship Programme PREIN, No.320165. We thank Shreya Mahajan for her assistance with the PXRD.
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