Mono‐ and tetranuclear copper(I) complexes with N‐heterocyclic chelating and triphenylphosphine ligands: Crystal structures, luminescent and heterogeneous catalytic properties

Abstract

N‐heterocyclic chelating and triphenylphosphine ligands react with cuprous halide to form a variety of copper(I) complexes, namely, mononuclear [Cu(PBO)(PPh3)Br].CH2Cl2 (1) and [Cu(PBM)(PPh3)I] (2) (PBO = 2‐(2′‐Pyridyl)benzoxazole, PBM = 2‐(2′‐Pyridyl)benzimidazole, PPh3 = triphenylphosphine) and tetranuclear [Cu4(μ2‐I)2(μ3‐I)2(PPh3)4].2CH2Cl2 (3) have been synthesized and characterized. Complexes 1 and 2 are basically alike; both of them are mononuclear and four‐coordinated, possessing a slightly distorted trigonal pyramidal geometry. Complex 3 is tetranuclear and the coordination numbers of the two copper(I) atoms are three and four, Cu(1) forming an approximate trigonal planar coordination environment, while Cu(2) is a slightly distorted trigonal pyramidal geometry, resulting in a distorted chair‐like conformation. Complexes 1 and 2 are emissive in the solid state at ambient temperature, with the maxima at 552 and 602 nm, respectively, due to a MLCT excited state. Moreover, complex 3 manifests promising heterogeneous catalytic activities for the degradation of methylene blue (MB), with degradation efficiency of 99% under ambient light.

Conversion of Waste Expanded Polystyrene into Blue-Emitting Polymer Film for Light-Emitting Diode Applications

“…The concentration of the PS-PBI solution in DMF is 1 × 10 −5 mol/L. As illustrated as in Figure 5 a, PS-PBI exhibits a broad excitation band centered at 360 nm in the range of 280 to 400 nm, which is attributed to the π→π* electronic transitions of the conjugated aromatic rings of PS-PBI, especially the benzimidazole groups [ 41 , 42 ]. Under 360 nm excitation, PS-PBI emits intense luminescence in the range of 400 to 450 nm ( Figure 5 b).…”

“…Under 360 nm excitation, PS-PBI emits intense luminescence in the range of 400 to 450 nm ( Figure 5 b). The strongest peak is located at 433 nm, corresponding to blue light owing to the blue-emitting benzimidazole groups bonded to PS [ 41 , 43 ]. The CIE coordinate calculated according to the emission spectrum ( Figure 5 b) is (0.153, 0.071), which falls in the blue region in the CIE chromaticity diagram ( Figure 5 c).…”

Design of luminescent complexes with different Cu4I4 cores based on pyridyl phenoxarsines

“…N^N-, [21][22][23] P^P-, 24 P^N-bidentate [25][26][27][28] ) and N^N^N-tridentate ligands, [29][30][31][32][33] while examples based on monodentate ligands are less common. 8,[34][35][36] The octahedral Cu 4 I 4 complexes are commonly supported by bidentate ligands, such as N^N-, 37 P^P, [38][39][40] and P^N-donors, [41][42][43][44][45][46][47][48] where both donor centers are located close to each other.…”