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The infra-red spectra of a number of halide, acetate and thiocyanate quinoline and quinolinium complexes of copper have been recorded for the first time. The significance of the frequency shifts of the quinoline bands in the complexes and the influence of the electronegativity of the halide ion on the frequency shifts in the monoquinoline cuprous halide complexes are discussed. Evidence is presented that the Cu (NCS)  2 .2 Q complex is probably binuclear.

The Infra-Red Absorption Spectra of the Addition Complexes of Quinoline with Copper Salts