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. Author manuscript; available in PMC: 2018 Apr 26.
Published in final edited form as: Catal Sci Technol. 2017 Apr 26;7(12):2474–2485. doi: 10.1039/C7CY00587C

Fig. 2.

Fig. 2

Structural formulas of Cu(I) ligands (1–21). The ligands are classified according to 1) donor types: [Tr,Tr,Tr] for 1–5, [Tr,Tr,Py] for 8, [Tr,Py,Py] for 9, [Py,Py,Py] for 10 and 11, [Py,Py,Ph] for 12–16, and [Tr,Tr,Ph] for 6 and 17–21, where Tr = triazoyl, Py = pyridyl, and Ph = phenyl; 2) chelate arm lengths: [6,6,6] for 2, 8–10, 12–14, 17 and 18, [5,5,5] for 1, 6, 11 and 21, [5,5,6] for 4 and 20, [5,6,6] for 5, 15, 16 and 19, and [7,7,7] for 3; and 3) methylation as in 13–16 and 18–21 to enhance the steric hindrance and electron donating property.