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A novel 1D hybrid salt (MQ)[CuBr2]∞ (MQ = N-methylquinoxalinium) is reported. Structural, spectroscopic and magnetic investigations reveal a minimal Cu(II) doping of less than 0.1%. However it is not possible to distinguish Cu(I) and Cu(II). The unusually close packing of the organic moieties and the dark brown colour of the crystals suggest a defect electronic structure.

Approaching the limit of CuII/CuI mixed valency in a CuIBr2–N-methylquinoxalinium hybrid compound

Approaching the limit of Cu^II/Cu^I mixed valency in a Cu^IBr₂–N-methylquinoxalinium hybrid compound