896463-03-9Relevant academic research and scientific papers
A structural probe for organogold(I) rings and [2]catenanes
Habermehl, Nicolle C.,Eisler, Dana J.,Kirby, Christopher W.,Yue, Nancy L.-S.,Puddephatt, Richard J.
, p. 2921 - 2928 (2006)
The digold(I) diacetylides [4-RC6H9(4-C 6H4OCH2C≡CAu)2], which contain a cyclohexylidene hinge group 4-RC6H9 with R = H or t-Bu, react with diphosphine ligands Ph2PZPPh2 to give the corresponding macrocycles or [2]catenanes [{4-RC6H 9(4-C6H4OCH2C≡CAu) 2(μ-Ph2PZPPh2)}y] [Z = C≡C, (CH2)2, (CH2)3, or (CH 2)4; y = 1, 2, or 4]. When R = t-Bu, the bulky tert-butyl group locks the cyclohexane ring conformation and so provides a good NMR spectroscopic probe of the structure. The organogold(I) [2]catenane complexes are chiral when R = t-Bu, and the complex with Z = (CH2)4 gives an equilibrium in solution between ring, double-ring, and [2]catenane. When R = H and Z = (CH2)3, the variable-temperature NMR spectra give new insight into the fluxionality in the [2]catenane complex, and when R = H and Z = (CH2)4, it is shown that the complex exists in solution as the ring structure, although it crystallizes as a doubly braided [2]catenane.
