Excited-State Proton Transfer of Weak Photoacids Adsorbed on Biomaterials: 8-Hydroxy-1,3,6-pyrenetrisulfonate on Chitin and Cellulose

Ron Simkovitch, Dan Huppert

Research output: Contribution to journalArticlepeer-review

Abstract

Time-resolved and steady-state florescence measurements were used to study the photoprotolytic process of an adsorbed photoacid on cellulose and chitin. For that purpose we used the 8-hydroxy-1,3,6-pyrenetrisulfonate (HPTS) photoacid which transfers a proton to water with a time constant of 100 ps, but is incapable of doing so in methanol or ethanol. We found that both biopolymers accept a proton from the electronically excited acidic ROH form of HPTS. The excited-state proton-transfer (ESPT) rate of HPTS adsorbed on chitin is greater than that on cellulose by a factor of 5. The ESPT on chitin also occurs in the presence of methanol or ethanol, but at a slower rate. The transferred protons can recombine efficiently with the conjugate excited base, the RO- form of HPTS.

Original languageEnglish
Pages (from-to)1973-1982
Number of pages10
JournalJournal of Physical Chemistry A
Volume119
Issue number10
DOIs
StatePublished - 12 Mar 2015

Fingerprint

Dive into the research topics of 'Excited-State Proton Transfer of Weak Photoacids Adsorbed on Biomaterials: 8-Hydroxy-1,3,6-pyrenetrisulfonate on Chitin and Cellulose'. Together they form a unique fingerprint.

Cite this