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Title: Effect of Cation-π Interaction on Macroionic Self-Assembly

Journal Article · · Angewandte Chemie (International Edition)
ORCiD logo [1];  [2];  [1];  [3];  [4];  [2];  [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. of Akron, Akron, OH (United States)
  2. Tsinghua Univ., Beijing (People's Republic of China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)

Abstract A series of rod‐shaped polyoxometalates (POMs) [Bu 4 N] 7 [Mo 6 O 18 NC(CH 2 O) 3 MnMo 6 O 18 (OCH 2 ) 3 CNMo 6 O 18 ] and [Bu 4 N] 7 [ArNMo 6 O 17 NC(CH 2 O) 3 MnMo 6 O 18 (OCH 2 ) 3 CNMo 6 O 17 NAr] (Ar=2,6‐dimethylphenyl, naphthyl and 1‐methylnaphthyl) were chosen to study the effects of cation–π interaction on macroionic self‐assembly. Diffusion ordered spectroscopy (DOSY) and isothermal titration calorimetry (ITC) techniques show that the binding affinity between the POMs and Zn 2+ ions is enhanced significantly after grafting aromatic groups onto the clusters, leading to the effective replacement of tetrabutylammonium counterions (TBAs) upon the addition of ZnCl 2 . The incorporation of aromatic groups results in the significant contribution of cation–π interaction to the self‐assembly, as confirmed by the opposite trend of assembly size vs. ionic strength when compared with those without aromatic groups. The small difference between two aromatic groups toward the Zn 2+ ions is amplified after combining with the clusters, which consequently triggers the self‐recognition behavior between two highly similar macroanions.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1461310
Alternate ID(s):
OSTI ID: 1423707
Journal Information:
Angewandte Chemie (International Edition), Vol. 57, Issue 15; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Hybrid polyoxometalates as post-functionalization platforms: from fundamentals to emerging applications journal January 2020
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Figures / Tables (5)