10.1002/ejic.202100295
European Journal of Inorganic Chemistry
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C, 62.12; H, 4.82. Found: C, 61.72; H, 5.22. ESI-MS (DCM,
1
+, m/z): 859 ([Cu(dppe)2]+). H NMR (CDCl3, 500 MHz, δ):
2.39 (d, 8H, CH2), 7.04-7.76 (m, 40H, Ph). 31P NMR (CD3CN,
500 MHz, δ): -144.63 (m, PF6-), 6.35 (br, dppe).
8.
[Cu(bpy)2]PF6 (3). bpy (62.4 mg, 0.4 mmol) was used as the
ligand. Reddish-brown solid was obtained following the
general procedure outlined above. Yield: 89.1 mg, 86% (based
on [Cu(MeCN)4]PF6). mp 239 °C. Anal. Calcd for
C20H16N4PF6Cu: C, 46.11; H, 3.10; N, 10.76. Found: C, 45.58;
H, 2.88; N, 11.30. ESI-MS (DCM, +, m/z): 375 ([Cu(bpy)2]+).
1H NMR (CDCl3, 500 MHz, δ): 7.56 (s, 4H), 8.10 (br, 4H),
8.44 (br, 8H).
9.
10.
11.
12.
[Cu(bpy)(dppe)]PF6 (4). dppe (79.6 mg, 0.2 mmol) and bpy
(31.2 mg, 0.2 mmol) were used as the ligands. Yellow solid
was obtained following the general procedure outlined above.
Yield: 140.8 mg, 93% (based on [Cu(MeCN)4]PF6). mp
235 °C. Anal. Calcd for C36H32N2P3F6Cu: C, 56.65; H, 4.24;
N, 3.67. Found: C, 57.08; H, 4.24; N, 3.43. ESI-MS (DCM, +,
m/z): 617 ([Cu(bpy)(dppe)]+). 1H NMR (CDCl3, 500 MHz, δ):
2.64 (dd, 4H, CH2), 7.14-7.44 (m, 20H, Ph), 7.49 (dd, 2H,
bpy), 8.17 (dd, 2H, bpy), 8.32 (d, 2H, bpy), 8.56 (d, 2H, bpy).
31P NMR (CD3CN, 500 MHz, δ): -144.63 (m, PF6-), -5.20 (br,
dppe).
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ASSOCIATED CONTENT
Supporting Information. This material is available free of
22.
23.
H. I. Karunadasa, C. J. Chang, J. R. Long,
Nature 2010, 464, 1329-33.
H. I. Karunadasa, E. Montalvo, Y. Sun, M. Majda,
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M. Drosou, F. Kamatsos, G. Ioannidis, A.
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AUTHOR INFORMATION
Corresponding Author
*E-mail for W.Y.F.: chmfanwy@nus.edu.sg.
24.
ACKNOWLEDGMENT
25.
26.
27.
J. Min, Q. Zhang, W. Sun, Y. Cheng, L. Wang,
Dalton Trans. 2011, 40, 686-93.
F. Fenwick, J. Am. Chem. Soc 1926, 48, 860-
870.
E. Solari, M. Latronico, P. Blech, C. Floriani, A.
Chiesi-Villa, C. Rizzoli, Inorg. Chem. 1996, 35,
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We acknowledge the National University of Singapore for
participating through a research grant 143-000-B49-114.
Keywords: Proton reduction • copper • electrochemistry •
mechanism • green chemistry
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Monkman, G. Iacobellis, P. Coppo, Dalton Trans.
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