title: Deciphering Noncovalent Interactions Accompanying 7,7,8,8-Tetracyanoquinodimethane Encapsulation within Biphene[n]arenes: Nucleus-Independent Chemical Shifts Approach.
abstract: Binding of novel biphene[n]arene hosts to antiaromatic 7,7,8,8-tetracyanoquinodimethane (TCNQ) are investigated by DFT. Biphene[4]arene favors the inclusion complex through noncovalent interactions, such as hydrogen bonding, π-π stacking, C-H⋅⋅⋅π, and C-H⋅⋅⋅H-C dihydrogen bonding. Donor-acceptor complexation renders aromatic character to the guest through charge transfer. The formation of TCNQ anionic radicals through supramolecular π stacking significantly influences its chemical and photophysical behavior. Electron density reorganization consequent to encapsulation of TCNQ reflects in the shift of characteristic vibrations in the IR spectra. The accompanying aromaticities arising from the induced ring currents are analyzed by employing nucleus-independent chemical shifts based profiles.
authors.affiliation: Department of Chemistry, Savitribai Phule Pune University, Pune, India.
authors.forename: Dipali N
authors.initials: DN
authors.lastname: Lande
authors.affiliation: Department of Chemistry, Savitribai Phule Pune University, Pune, India.
authors.forename: Soniya S
authors.initials: SS
authors.lastname: Rao
authors.affiliation: Department of Chemistry, Savitribai Phule Pune University, Pune, India. spgejji@chem.unipune.ac.in.
authors.forename: Shridhar P
authors.identifier: http://orcid.org/0000-0003-3305-2475
authors.initials: SP
authors.lastname: Gejji
keywords: NMR spectroscopy; charge transfer; density functional calculations; host-guest systems; pi interactions