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Issue 20, 2013
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Structure and energetics of gas phase halogen-bonding in mono-, bi-, and tri-dentate anion receptors as studied by BIRD

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Abstract

Complexes of mono-, bi- (RB), and tridentate (RT) receptors with a range of anions (Cl, Br, I, NO3, H2PO4, HSO4, and tosylate (TsO)) have been studied in the gas phase by both experimental and theoretical methods. Temperature dependent blackbody infrared radiative dissociation (BIRD) experiments were performed on complexes of C8F17I with Br and I, RB with I, NO3, HSO4, H2PO4, and TsO, and RT with I, HSO4 and TsO and the observed Arrhenius parameters are reported here. Master equation modeling of the BIRD kinetics data was carried out to determine threshold dissociation energies. Geometry optimizations and thermochemistry calculations were performed using the B3LYP/6-31+G(d,p) level of theory. Additional single point energies were calculated using MP2/6-311++G(2d,p). Results were examined in terms of the binding order of various anions as well as the added binding strength from additional halogen bonding (XB) interactions. The relative binding energies of ions were generally consistent with the ordering previously reported from solution phase experiments; however, the relatively strong binding of H2PO4 to the bidentate receptor contrasted the solution phase observation of oxoanions having weaker interactions when compared to halides. An increase in the energy required to remove the same anion from the tridentate receptor when compared to the bidentate and monodentate receptors is explained as being due to the increase in halogen bonding interactions. The possibility of mixed halogen and hydrogen bonded complexes were considered.

Graphical abstract: Structure and energetics of gas phase halogen-bonding in mono-, bi-, and tri-dentate anion receptors as studied by BIRD

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Article information


Submitted
09 Jan 2013
Accepted
20 Mar 2013
First published
21 Mar 2013

Phys. Chem. Chem. Phys., 2013,15, 7638-7647
Article type
Paper

Structure and energetics of gas phase halogen-bonding in mono-, bi-, and tri-dentate anion receptors as studied by BIRD

E. A. L. Gillis, M. Demireva, M. G. Sarwar, M. G. Chudzinski, M. S. Taylor, E. R. Williams and T. D. Fridgen, Phys. Chem. Chem. Phys., 2013, 15, 7638 DOI: 10.1039/C3CP00105A

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