Synlett 2017; 28(20): 2795-2799
DOI: 10.1055/s-0036-1590865
letter
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Novel BTPhen-Functionalized Silica-Coated Magnetic Nanoparticles for Separating Trivalent Actinides and Lanthanides

Ashfaq Afsara, Joseph Cowella, Petr Distlerb, Laurence M. Harwood*a, Jan Johnb, James Westwooda
  • aChemical Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6AD, UK   Email: l.m.harwood@reading.ac.uk
  • bDepartment of Nuclear Chemistry, Czech Technical University in Prague, Břehová 7, 11519 Prague 1, Czech Republic   Email: jan.john@fjfi.cvut.cz
The authors acknowledge the UK Engineering and Physical Sciences Research Council (grant No. EP/M026485/1) and the Grant Agency of the Czech Technical University in Prague (grant No. SGS15/216/OHK4/3T/14) for financial support (A.A. and P.D., respectively).
Further Information

Publication History

Received: 05 June 2017

Accepted after revision: 13 July 2017

Publication Date:
17 August 2017 (eFirst)

Dedicated to Victor Snieckus, a valued friend and colleague, on the occasion of his 80th birthday

Abstract

Bis-(1,2,4-triazin-3-yl)-1,10-phenanthroline (BTPhen) functionalized magnetic nanoparticles (MNPs), which selectively extract Am(III) over europium(III) from 0.1 M HNO3 with fast kinetics and a separation factor of 30 have been synthesized. These MNPs also show a small but significant selectivity for Am(III) over Cm(III) with a separation factor of around 3 in 0.1 M HNO3. We report also the synthesis of these BTPhen and related ligands via an improved synthetic route bypassing the problematic benzylic oxidation with stoichiometric SeO2.

Supporting Information

 
  • References and Notes

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  • 38 Synthesis of BTPhen 10 To a suspension of 1,10-phenanthroline-2,9-dicarbohydrazon­amide (8, 0.60 g, 2 mmol) in THF (100 mL) and MeOH (100 mL) was added 4,4′-dihydroxybenzil (9, 1.10 g, 4.6 mmol, 2.3 equiv). Et3N (50 mL, 356.2 mmol) was added, and the mixture was heated at 81 °C for 3 d. The solution was allowed to cool to r.t., filtered, and the remaining solid residue washed with CH2Cl2 (25 mL). The filtrate was evaporated, and the solid was triturated with MeOH (100 mL). The insoluble solid was filtered, washed with further MeOH (50 mL) and Et2O (50 mL), and allowed to dry in air to afford the ligand 10 as a yellow solid (0.99 g, 69%); mp 280–282 °C (decomposed). 1H NMR (400 MHz, DMSO-d 6): δ = 6.78–6.93 (m, 8 H), 7.51–7.71 (m, 8 H), 8.11 (s, 2 H), 8.58 (d, J = 8.0 Hz, 2 H), 8.61 (d, J = 8.0 Hz, 2 H). 13C NMR (101 MHz, DMSO-d 6): δ = 115.4, 122.9, 125.5, 126.1, 127.7, 129.5, 130.7, 131.6, 137.7, 145.5, 152.6, 154.6, 155.3, 159.0, 159.6, 160.5. FTMS + P ESI: m/z calcd for C42H27O4N8 [M + H]+: 707.2150; found: 707.2153. IR: νmax = 3206, 1608, 1590, 1483, 1442 cm–1.