Synthesis of porphyrin cored hyperbranched polymers

Supramolecular Chemistry

Volumn 18, Issue 4, 2006, Pages 357-360

  Twyman, Lance J ^a   Ge, Yi ^a   Gittins, Peter J ^a  

^a UNIVERSITY OF SHEFFIELD   (United Kingdom)

Author keywords

Core; Dendritic; Hyperbranched polymers; Porphyrin

Indexed keywords

EID: 33746792407     PISSN: 10610278     EISSN: 10290478     Source Type: Journal    
DOI: 10.1080/10610270600643548     Document Type: Article

References (14)

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11. Turner, S. R.; Voit, B. I.; Mourey, T. H. Macromolecules 1993, 26, 4617.
12. Twyman, L. J.; Beezer, A. E.; Mitchel, J. C. As GPC often underestimates the molecular weights of globular polymers it is not necessary for (or expected that) the molecular weights obtained from these two methods to be identical (i.e. core analysis and GPC)Chem. Soc. Perkin 1. 1994, 4, 407, and references therein.
13. Preparative GPC was carried out using a glass column packed with Bio-Beads S-X1 beads (Bio-Rad Laboratories). The beads were pre-swollen overnight with THF and the slurry packed into a column (20 mm diameter, 600 mm column height/300 mm packed height). The THF was exchanged for eluent by passing 10 column lengths of CH2Cl2 through the column, 500 mg of crude polymer was then added to the column bed and the column eluted under gravity.
14. Good mass spectra for the larger fractions were more difficult to obtain and the ESMS spectra recorded were similar to the original bulk polymer. That is, a series of peaks of decreasing intensity each separated by a single monomer unit (178 Da). However, because the fractionation and UV experiments had previously shown that the core was evenly distributed across all fractions, a good mass spectrum from just one fraction, is all that's required to determine the overall level of incorporation