Cellulose

, Volume 12, Issue 1, pp 85–96

Synthesis and SAM formation of water soluble functional carboxymethylcelluloses: thiosulfates and thioethers

  • Gerhard Wenz
  • Petra Liepold
  • Nico Bordeanu
Article
  • 115 Downloads

Abstract

Functional thiomethyl and thiosulfate derivatives of carboxymethylcellulose (CMC, DS = 0.9) were synthesized by nucleophilic displacement reactions. Alkylation of CMC by allyl glycidyl ether took mainly place at the primary positions of the cellulose backbone and yielded a 6-O-(3′-allyloxy-2′-hydroxypropyl)-CMC 1 with a partial DS of 3′-allyloxy-2′-hydroxypropyl substituents DSallyl of up to 0.43. Addition of tetrathionate to the allyl groups gave rise to 6-O-(2′′,3′′-bis(thiosulfato)propoxy-2′-hydroxypropyl)-CMC 2. As the addition of tetrathionate was sluggish and incomplete, alternatively bromine was added and the resulting dibromide was substituted by thiosulfate. A 40% conversion of the allyl groups was achieved by this two-step procedure. On the other hand, the addition of bromine to 1 in aqueous solution almost quantitatively yielded the bromohydrin derivative which was converted by displacement reaction with thiosulfate to 6-O-(2′′-hydroxy-3′′-thiosulfatopropoxy-2′-hydroxypropyl)-CMC 4. 6-Thiomethyl-6-deoxy-CMC 6 was synthesized by displacement reaction of 6-O-tosylcellulose with sodium methylsulfide and subsequent carboxymethylation of the cellulose backbone. A partial DS of thiomethyl substituents DSThM=0.65 exclusively at the primary positions was obtained. All functional CMC derivatives, 2, 4, and 6 were readily available in gram quantities, rather stable and highly water soluble for pH > 3. On gold surfaces they form self-assembled monolayers (SAMs) with thicknesses of 1.2 to 2.4 nm as determined by surface plasmon resonance (SPR).

Carboxymethylcellulose (CMC) CMC allylhydroxypropylether CMC thiosulfate Self-assembled monolayer (SAM) Thiomethyl CMC 

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Copyright information

© Kluwer Academic Publishers 2005

Authors and Affiliations

  • Gerhard Wenz
    • 1
  • Petra Liepold
    • 2
  • Nico Bordeanu
    • 1
  1. 1.Organische Makromolekulare ChemieUniversität des SaarlandesSaarbrückenGermany
  2. 2.FRIZ BiochemMünchenGermany

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