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The halogen bonding (XB) (i.e. the attractive interaction where halogens work as electron density acceptors) is a particularly robust and directional noncovalent interaction [1]. Thanks to these properties, effective tectons tailored to XB-based crystal engineering could be successfully developed. In this communication, it will be shown how the judicious choice of electron donor and acceptor modules enables the fine control of the structural and functional properties of the formed supramolecular architectures. Topologies as complex as Borromean links [2] and homochiral double helices (figure) can be planned in a rational way [3].

Halogen bonding-based crystal engineering: from Borromean links to homochiral double helices