Abstract
Noble gas (or aerogen) bond (NgB) can be outlined as the attractive interaction between an electron-rich atom or group of atoms and any element of Group-18 acting as an electron acceptor. The IUPAC already recommended systematic nomenclature for the interactions of groups 17 and 16 (halogen and chalcogen bonds, respectively). Investigations dealing with noncovalent interactions involving main group elements (acting as Lewis acids) have rapidly grown in recent years. They are becoming acting players in essential fields such as crystal engineering, supramolecular chemistry, and catalysis. For obvious reasons, the works devoted to the study of noncovalent Ng-bonding interactions are significantly less abundant than halogen, chalcogen, pnictogen, and tetrel bonding. Nevertheless, in this short review, relevant theoretical and experimental investigations on noncovalent interactions involving Xenon are emphasized. Several theoretical works have described the physical nature of NgB and their interplay with other noncovalent interactions, which are discussed herein. Moreover, exploring the Cambridge Structural Database (CSD) and Inorganic Crystal Structure Database (ICSD), it is demonstrated that NgB interactions are crucial in governing the X-ray packing of xenon derivatives. Concretely, special attention is given to xenon fluorides and xenon oxides, since they exhibit a strong tendency to establish NgBs.
Highlights
IntroductionMolecular recognition and self-assembly are concepts related to supramolecular chemistry [1,2,3,4,5], where molecules interact with other molecules or themselves
Exploring the Cambridge Structural Database (CSD) and Inorganic Crystal Structure Database (ICSD), it is demonstrated that Noble gas (or aerogen) bond (NgB) interactions are crucial in governing the X-ray packing of xenon derivatives
Molecular recognition and self-assembly are concepts related to supramolecular chemistry [1,2,3,4,5], where molecules interact with other molecules or themselves
Summary
Molecular recognition and self-assembly are concepts related to supramolecular chemistry [1,2,3,4,5], where molecules interact with other molecules or themselves. These processes are guided by noncovalent interactions that spontaneously govern the formation of supramolecular assemblies Chemists working in this field of research desire to control the molecular recognition process as precisely as possible, to generate more effective receptors, polymers, sensors, catalysts, etc. Crystal engineers and supramolecular chemists need to deeply understand the physical nature of noncovalent interactions and their distinctive properties such as strength, tunability, directionality etc., for the successful control of supramolecular chemistry processes [6]. Noble gas or aerogen-bonding interactions were termed as such in 2015 [81], and afterward, several experimental [82,83,84] and theoretical [85,86,87,88,89] investigations have appeared in the literature describing and confirming their relevance in X-ray structures and its interplay with other interactions. The noble gas bonds are σ–hole based interactions in XeF6 and XeO3 adducts and π–hole based interactions in XeF2 and XeF4 adducts
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