Alternating Right- and Left-Handed Helical Loops in a Self-Assembled Polymer: Direct Observation of Ring-Opening Polymerization of a Macrocyclic Gold Complex
✍ Scribed by Zengquan Qin; Michael C. Jennings; Richard J. Puddephatt
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 108 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0947-6539
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✦ Synopsis
Reaction of the ligand NN'-bis(pyridin-3-yl)-1,3-benzenedicarboxamide (1) with the diphosphanedigold(I) complex [(mu-PP)(AuO2CCF3)2] occurred by displacement of the trifluoroacetate ligands by the pyridyl groups of 1, and crystallization gave the macrocyclic complex Au2(mu-PP)(mu-1)2 (2b), when PP = trans-[Ph2PCH=CHPPh2] but the polymer [(Au2(mu-PP)(mu-1)]x](CF3CO2)2x (3), when PP= Ph2PCH2CH2PPh2. The polymer 3 contains a series of helical turns connected by linear chain sections. and the helices have alternating right- and left-handed conformations. The polymer 3 dissolves to give an equilibrium mixture of the macrocyclic ring complex Au2(mu-PP)(mu-1)2 (2a), and ring-opened oligomers, thus giving insight into the mechanism of the ring-opening polymerization reaction.