Add time:08/19/2019         Source:sciencedirect.com

Gluconate anions (Gluc−) and N-(1-naphthly)ethylenediammonium cations (NEDA2+) capped Ag-NPs (Gluc-Ag-NPs and NEDA-Ag-NPs) were employed to study interactions with macrocyclic polyammonium cations (MCPACs), which are reputed anion recognizers and as to mimic biopolyamines. The studies were done on UV–Vis spectroscopy and Transmission Electron Microscope (TEM). Surface adsorbed Gluc− ions being anionic in nature, interact with MCPACs kinetically, whereas positively charged NEDA2+ ions do not show any such interactions. The resulting associated complex, Gluc−…MCPACs for Me6[14]ane-(NH2+)4 (Tet-A/Tet-B) or [32]ane-(NH2+)8 (32-MCPAC) is existed with the particles up to certain concentration of MCPACs, termed as critical coagulation concentration (CCC). The CCC value of 32-MCPAC (0.021 μM) is quite less than that of Tet-A (21.06 μM) and Tet-B (20.90 μM); as a consequence, the association constant (Kasso) of Gluc—32-MCPAC (1.38×107 M−1) complex is much greater than that of Gluc—Tet-A/Tet-B (∼4.5×104 M−1) complex. Reduction of 4-nitrophenol (4-NP) (anionic in presence of BH4−) to 4-aminophenol (4-AP) using the anionic Gluc-Ag-NPs as a potential catalyst occurs more effectively and rapidly, whereas using the cationic NEDA-Ag-NPs the reaction does not occur. Again the surface charges of the particles play an important role to explore their employability as a potential catalyst.

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