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Abstract
A series of Cu+ complexes, [Cu2(L)(dppe)2](BF4)2 (1), [Cu2(L)(dppp)2](BF4)2·2CH3CN (2), and [Cu2(L)(dppe)2](ClO4)2 (3) (L = N,N′-bis(dipyridin-2-ylmethylene)benzene-1,4-diamine, dppe = 1,2-bis(diphenylphosphino)ethane, and dppp = 1,3-bis(diphenyl phosphino)propane), have been synthesized and characterized by IR, 1H NMR, 31P NMR, UV–vis spectrum, and X-ray crystal structure analysis. The structural analysis reveals each Cu+ is four-coordinate N2P2 and adopts a distorted-tetrahedral geometry. Crystal structures of 1–3 contain 1-D supramolecular arrays constructed by intermolecular π⋯π interactions, with variations in π-stacking patterns. The ordered-layer-lattice or CH3CN is located between 1-D arrays. The absorption peaks of 1 and 2 in acetonitrile at room temperature display ILCT and MLCT absorptions. Emission experiments show solid-state emissions of 1 and 2 are not similar to those of solution samples. The conversion efficiency of 1 and 2 in dye-sensitized solar cells is extremely poor (<0.1%).
