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Title: Evidence for Interfacial Halogen Bonding

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [2];  [2];  [2];  [1];  [1];  [2]
  1. Department of Chemistry The University of North Carolina at Chapel Hill Murray Hall 2202B Chapel Hill NC 27599-3290 USA
  2. Departments of Chemistry and Chemical &, Biological Engineering The University of British Columbia 2036 Main Mall Vancouver BC V6T1Z1 Canada

Abstract A homologous series of donor–π–acceptor dyes was synthesized, differing only in the identity of the halogen substituents about the triphenylamine (TPA; donor) portion of each molecule. Each Dye‐X (X=F, Cl, Br, and I) was immobilized on a TiO 2 surface to investigate how the halogen substituents affect the reaction between the light‐induced charge‐separated state, TiO 2 (e )/ Dye‐X + , with iodide in solution. Transient absorption spectroscopy showed progressively faster reactivity towards nucleophilic iodide with more polarizable halogen substituents: Dye‐F < Dye‐Cl < Dye‐Br < Dye‐I . Given that all other structural and electronic properties for the series are held at parity, with the exception of an increasingly larger electropositive σ‐hole on the heavier halogens, the differences in dye regeneration kinetics for Dye‐Cl , Dye‐Br , and Dye‐I are ascribed to the extent of halogen bonding with the nucleophilic solution species.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0013461
OSTI ID:
1400961
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Vol. 55 Journal Issue: 20; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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