In:
Angewandte Chemie, Wiley, Vol. 127, No. 1 ( 2015-01-02), p. 186-191
Abstract:
Ag 44 ( p ‐MBA) 30 4− ( p ‐MBA= para ‐mercaptobenzoic acid) nanocluster (NC) supracrystals (SCs) with customizable shapes can be obtained by simply altering the type and concentration of the counterions of the p ‐MBA ligands in the dimethylsulfoxide (DMSO)/water crystallization system. Changing the counterion of the p ‐MBA ligand from H + to Cs + eliminates the directional hydrogen bonds in the SCs, resulting in the packing of deprotonated Ag 44 ( p ‐MBA) 30 4− NCs into octahedral SCs, which is in stark contrast to the rhombohedral SCs that were formed by the packing of protonated Ag 44 ( p ‐MBA) 30 4− NCs in previous studies. Furthermore, the double layer of deprotonated Ag 44 ( p ‐MBA) 30 4− NCs is sensitive to charge screening induced by increasing the Cs + concentration, thereby providing a means to regulate the precipitation kinetics of the Ag 44 ( p ‐MBA) 30 4− NCs for SC shape engineering. Slow precipitation kinetics was found to favor over‐growth at the corners and edges of the octahedral SC nuclei, shaping the SCs into concave octahedra.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.201408675
Language:
German
Publisher:
Wiley
Publication Date:
2015
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