The dark-blue crystal color of {(C4H12N2)2[CuII4](I2)}n, its mixture of I−, I3− and linear I42− or linear I5− polyiodide species in a linear channel arrangement, its channel diameter of ∼5.5 Å and the helical arrangement of the hydrogen bonded {(C4H12N2)2[CuII4]}+ supramolecular host around the channels agree with the description of the classical, yet structurally elusive, starch–iodine compound.
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