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Issue 35, 2018
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Adaptive responses of sterically confined intramolecular chalcogen bonds

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Abstract

The responsive behavior of an entity towards its immediate surrounding is referred to as an adaptive response. The adaptive responses of a noncovalent interaction at the molecular scale are reflected from its structural and functional roles. Intramolecular chalcogen bonding (IChB), an attractive interaction between a heavy chalcogen E (E = Se or Te) centered sigma hole and an ortho-heteroatom Lewis base donor D (D = O or N), plays an adaptive role in defining the structure and reactivity of arylchalcogen compounds. In this perspective, we describe the adaptive roles of a chalcogen centered Lewis acid sigma hole and a proximal Lewis base (O or N) in accommodating built-in steric stress in 2,6-disubstituted arylchalcogen compounds. From our perspective, the IChB components (a sigma hole and the proximal Lewis base) act in synergism to accommodate the overwhelming steric force. The adaptive responses of the IChB components are inferred from the observed molecular structures and reactivity. These include (a) adaptation of a conformation without IChBs, (b) adaptation of a conformation with weak IChBs, (c) twisting the skeletal aryl ring while maintaining IChBs, (d) ionization of the E–X bond (e.g., X = Br) to relieve stress and (e) intramolecular cyclization to relieve steric stress. A comprehensive approach, involving X-ray data analysis, density functional theory (DFT) calculations, reaction pattern analysis and principal component analysis (PCA), has been employed to rationalize the adaptive behaviors of IChBs in arylchalcogen compounds. We believe that the perception of ChB as an adaptive/stimulus responsive interaction would profit the futuristic approaches that would utilise ChB as self-assembly and molecular recognition tools.

Graphical abstract: Adaptive responses of sterically confined intramolecular chalcogen bonds

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Publication details

The article was received on 29 Apr 2018, accepted on 24 Jul 2018 and first published on 25 Jul 2018


Article type: Perspective
DOI: 10.1039/C8SC01943F
Citation: Chem. Sci., 2018,9, 7027-7042
  • Open access: Creative Commons BY-NC license
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    Adaptive responses of sterically confined intramolecular chalcogen bonds

    K. Selvakumar and H. B. Singh, Chem. Sci., 2018, 9, 7027
    DOI: 10.1039/C8SC01943F

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