Synthesis, crystal structure and photophysical study of luminescent three-coordinate cuprous bromide complexes based on pyrazole derivatives. Issue 6 (18th March 2016)

• Record Type: Journal Article
• Authors: Wu, Fengshou; Tong, Hongbo; Wang, Kai; Zhang, Xiulan; Zhang, Jie; Wong, Wai-Kwok; Zhu, Xunjin
• Is Part Of: Journal of coordination chemistry. Volume 69:Issue 6(2016)
• Page Start: 926
• Page End: 933
• Publication Date: 2016-03-18
• Subjects: Cuprous bromide -- luminescence -- crystal structures -- three coordinate; Coordination compounds -- Periodicals; 541.2242
• DOI: 10.1080/00958972.2016.1139102
• Languages: English
• ISSNs: 0095-8972

Abstract

Abstract: The 1 : 2 M-ratio reaction between cuprous bromide and pyrazole derivatives in toluene results in mononuclear Cu(I) complexes [CuBr(pyrazole)2 ]. The complexes have been characterized by 1 H NMR spectroscopy and elemental analysis. The molecular structure, established by single-crystal X-ray diffraction, features a trigonal planar geometry around copper, with monodentate pyrazole derivatives. All the Cu(I) complexes are luminescent in the solid state at ambient temperature. Intense blue or blue-green emission in the solid state is observed for these complexes, with the maxima ranging from 431 to 493 nm. The observed photoluminescence could be ascribed to the metal-to-ligand charge-transfer excited states, probably mixed with some halide-to-ligand character. The microsecond lifetime scale of the complexes implies that these transitions arise from the triplet excited states. Abstract :