Steric hindrance effects in tripodal ligands for extraction and back-extraction of Ag+

Yuki Hiruta; Takafumi Watanabe; Etsuko Nakamura; Naoko Iwasawa; Hiroyasu Sato; Kensaku Hamada; Daniel Citterio; Koji Suzuki

doi:10.1039/C3RA45700A

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Steric hindrance effects in tripodal ligands for extraction and back-extraction of Ag⁺†

Yuki Hiruta,‡§^a Takafumi Watanabe,§^a Etsuko Nakamura,^a Naoko Iwasawa,^a Hiroyasu Sato,^b Kensaku Hamada,^b Daniel Citterio^a and Koji Suzuki*^a

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* Corresponding authors

^a Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
E-mail: suzuki@applc.keio.ac.jp
Fax: +81 45 566 1566
Tel: +81 45 566 1566

^b Rigaku Corporation, 3-9-12, Matsubara-cho, Akishima-shi, Tokyo, Japan

Abstract

A novel series of tripodal ligands with thiophenylether arms connected to an anchoring nitrogen has been investigated. Seven tripodal ligands were synthesized by combining methyl, isopropyl, and tert-butyl residue bearing thiophenylether sites as groups with different steric hindrance effects. The tripodal ligands allowed for the extraction of Ag⁺ ions from the aqueous phase into a chloroform phase by forming 1 : 1 complexes with Ag⁺. Back-extraction was performed with 1 M HNO₃ aqueous solution. Each ligand showed different extraction and back-extraction efficiency for Ag⁺, affected by changes in steric hindrance caused by the various combinations of sidearms. These results are further supported by X-ray single crystal structural analysis.

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DOI: https://doi.org/10.1039/C3RA45700A
Article type: Paper
Submitted: 10 Oct 2013
Accepted: 27 Jan 2014
First published: 28 Jan 2014
This article is Open Access

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RSC Adv., 2014,4, 9791-9798

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Steric hindrance effects in tripodal ligands for extraction and back-extraction of Ag⁺

Y. Hiruta, T. Watanabe, E. Nakamura, N. Iwasawa, H. Sato, K. Hamada, D. Citterio and K. Suzuki, RSC Adv., 2014, 4, 9791 DOI: 10.1039/C3RA45700A

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