Abstract
Taking turns: Reaction of an anionic bis-phosphine with Cu+ produces a monomeric complex that crystallizes as a dimeric helicate (see picture). The helicate dissolves again in non-coordinating solvents, but disassembles upon addition of a donor solvent. The observed behavior implies that the helicate is metastable in solution, and persists only because its disassembly is impeded by a high kinetic barrier.
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