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Synthesis, structures and luminescent properties of amine-bis(N-heterocyclic carbene) copper(I) and silver(I) complexes

Abstract

A series of Ag(I) and Cu(I) complexes [Ag3(L1)2][PF6]3 (8), [Ag3(L2)2][PF6]3 (9), [Cu(L1)][PF6] (10) and [Cu(L2)][PF6] (11) have been synthesized by reactions of the tridentate amine-bis(N-heterocyclic carbene) ligand precursors [H2L1][PF6]2 (6) and [H2L2][PF6]2 (7) with Ag2O and Cu2O, respectively. Complexes 10 and 11 can also be obtained by transmetalation of 8 and 9, respectively, with 3.0 equiv of CuCl. A heterometallic Cu/Ag-NHC complex [Cu2Ag(L1)2(CH3CN)2][PF6]3 (12) is formed by the reaction of 8 with 2.0 equiv of CuCl. All complexes have been characterized by NMR, electrospray ionization mass spectrometry (ESI-MS), and single-crystal X-ray diffraction studies. The luminescent properties of 10-12 in solution and the solid state have been studied. At room temperature, 10-12 exhibit evident luminescence in solution and the solid state. The emission wavelengths are found to be identical at 483 nm in CH3CN, but they are 484, 480 and 592 nm in the solid state for 10-12, respectively. These results suggest that 12 dissociates into two molecules of 10 and Ag(I) ion in solution. Complex 12 is the first luminescent heterometallic Cu/Ag-NHC complex.

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Publication details

The article was received on 13 Feb 2018, accepted on 14 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00599K
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Synthesis, structures and luminescent properties of amine-bis(N-heterocyclic carbene) copper(I) and silver(I) complexes

    T. Lu, J. Wang, L. Shi, Z. Chen, X. Chen and Z. B. Xue, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00599K

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