Journal
DALTON TRANSACTIONS
Volume 47, Issue 21, Pages 7290-7299Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt01232f
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Funding
- Foundation for Science and Technology (FCT), Portugal [UID/QUI/00100/2013]
- NCN program, Poland [2012/07/B/ST/00885]
- CATSUS doctoral program of FCT [SFRH/BD/106006/2014]
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New hydrosoluble and air-stable Cu(i) halide compounds, viz. [CuX(DAPTA)(3)] (1) and (2), and [Cu(-X)(DAPTA)(2)](2) (3) and (4) (X = Br or I, in this order), have been prepared by reacting Cu(i) halide (i.e., bromide or iodide) with 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane (DAPTA) under mild conditions. They represent the first examples of Cu(i) halide complexes bearing the DAPTA ligand, which have been fully characterized by elemental analysis, IR, H-1, C-13{H-1} and P-31{H-1} NMR spectroscopies, ESI-MS+ and, for 4, also by single-crystal X-ray diffraction (SCXRD) analyses. Complexes 1-4 are efficient catalysts for the one-pot microwave assisted three-component (terminal alkyne, organic halide and NaN3) Huisgen cycloaddition reaction in aqueous media to afford the corresponding disubstituted triazoles. The catalysis proceeds with a broad alkyne substrate scope and according to click rules. Photophysical studies of compound 4 showed an unusual reversible thermochromic behaviour exhibiting a blue emission at 298 K due to the halide-to-ligand charge transfer ((XLCT)-X-3) and a red emission at 77 K because of the {Cu2I2} unit.
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