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A New Class of Dendritic Metallogels with Multiple Stimuli‐Responsiveness and as Templates for the In Situ Synthesis of Silver Nanoparticles
Author(s) -
Liu ZhiXiong,
Feng Yu,
Zhao ZhiYong,
Yan ZhiChao,
He YanMei,
Luo XuJun,
Liu ChenYang,
Fan QingHua
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201302780
Subject(s) - template , solvophobic , stacking , ligand (biochemistry) , pyridine , nanoparticle , chemistry , in situ , aryl , combinatorial chemistry , ether , molecule , silver nanoparticle , materials science , nanotechnology , organic chemistry , receptor , biochemistry , alkyl
A new class of poly(aryl ether) dendritic ligands containing a pyridine functionality at the focal point and the corresponding Ag I complexes through metal–ligand coordination were designed, synthesized, and fully characterized. Compared with the dendritic ligands, the corresponding dendritic complexes exhibited much better gelation ability for various organic solvents at very low critical gelation concentrations. The gel–sol phase transition temperatures and morphologies could be finely tuned by binding silver ion to the ligand. A preliminary study revealed that multiple noncovalent interactions, such as Ag I –pyridine coordination, solvophobic interaction, and π–π stacking, synergistically enable the formation of stable metallogels. Interestingly, these metallogels could intelligently respond to multiple external stimuli including temperature, chemicals, and shear stress, leading to gel–sol phase transitions. In addition, these dendritic metallogels were successfully applied as templates for the in situ formation and stabilization of silver nanoparticles without the use of any chemical reducing/stabilizing agents.