Copper(I) Coordination Polymers with Extended π•••π Interactions: Syntheses, Structures, Characterization and Luminescent Properties

Two copper(I) coordination polymers, {[Cu-2(4-bpo)(2)(CH3CN)(2)(PPh3)(2)](BF4)(2)}(n) (1), {[Cu(4-bpo)(CH3CN) (dppe)05]BF4}(n) (2) (PPh3=triphenylphosphine, dppe=1,2-bis(diphenyl phosphino)ethane, 4-bpo=2,5-bis(4-pyridyl)1,3,4-oxadiazole), have been synthesized and characterized by IR, H-1 NMR, F-19 NMR, B-11 NMR, elemental analysis and X-ray crystal structure analysis. The structural analysis shows that complexes 1 and 2 consist of diverse and interesting 2D supramolecular structures formed by inter-chain interactions. For 1, pi-stacking interactions result in the construction of 1D bilayer chain and 2D supramolecular network. Compound 2 exhibits a 1D ladder-like chain and a 1D+1D -> 2D/3D supramolecular structure formed by pi-stacking interactions. Solid-state emission spectra of complexes 1 and 2 have been studied, displaying the existence of ILCT/MLCT excited states. CCDC: 1043971, 1; 1043972, 2.