Spectroscopic properties and the catalytic activity of new organo-lead supramolecular coordination polymer containing quinoxaline

• The SCP 3∞[Cu2(CN)3(Me3Pb)(qox)], 1, consists of parallel [Cu2(CN)3] chains connected by quinoxaline.
• 2D-layers are arranged in (AB⋯AB)n fashion forming 3D-network. Spectral properties are investigated.
• The SCP 1 exhibits good catalytic and photo-catalytic activities for MB degradation.
• The reaction is first order and the UV-irradiation enhanced the rate of MB mineralization.

The 3D-supramolecular coordination polymer (SCP) 3∞[ Cu2(CN)3(Me3Pb)(qox)], 1, as the first example of the CuCN SCP containing the (Me3Pb) fragment, was explored to investigate its catalytic and photo-catalytic activities. The structure of 1 contains two chemically identical but crystallographically different [Cu2(CN)3⋅Me3Pb⋅qox]2 units with four Cu(I) sites assuming distorted TP-3 geometry. Two non-linear chains of equal abundance are formed producing corrugated parallel chains which are connected laterally by quinoxaline creating 2D-layers which are arranged parallel in an (AB⋯AB⋯AB)n fashion forming 3D-network. IR, mass, electronic absorption and fluorescence spectra are also investigated. The SCP 1 is diamagnetic and exhibits good catalytic and photo-catalytic activities for the degradation of methylene blue (MB). The reaction is first order with respect to MB dye. The irradiation of the reaction with UV-light enhanced the rate of MB mineralization. The efficiency of recycled the 1 and the mechanism of degradation of MB dye were investigated.

Visualization of the 3D-network structure of the SCP 1 down the projection of a-axis showing the methyl groups located in the space between the layers.Figure optionsDownload as PowerPoint slide