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Role of Au(III) coordination by polymer in "green" synthesis of gold nanoparticles using chitosan derivatives.

Abstract：

:Here we report "green" synthesis of gold nanoparticles in solutions of heterocyclic chitosan derivatives (N-(4-imidazolyl)methylchitosan (IMC), N-2-(2-pyridyl)ethylchitosan (2-PEC), and N-2-(4-pyridyl)ethylchitosan (4-PEC)) and show how efficiency of Au(III) binding to polymer influences the Au(III) reduction rate and the size of the gold nanoparticles formed using only the reducing power of these chitosan derivatives. Rheology measurements and (1)H NMR spectroscopy data have confirmed that cleavage of glycosidic bond is a common mechanism of reducing species generation in solutions of chitosan and its N-heterocyclic derivatives. However, the emerging additional reducing species in 2-PEC and 4-PEC solutions due to vinylpyridine elimination promotes Au(III) reduction and gold nanoparticles growth despite lower efficiency of glycosidic bond cleavage in pyridyl derivatives. The decrease of the average size of gold nanoparticles in the row chitosan>2-PEC>IMC supported assumption that the increase of ligand nucleophilicity and stability of Au(III)-polymer complex results in formation of smaller nanoparticles.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Pestov A,Nazirov A,Privar Y,Modin E,Bratskaya S

doi

10.1016/j.ijbiomac.2016.05.102

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

457-64

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(16)30516-5

journal_volume

91

pub_type

杂志文章

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