ASSOCIATION BEHAVIOR OF PORPHYRIN PENDANTS IN pH-SENSITIVE WATER-SOLUBLE POLYMER

Ke-wei Ding; Fei Wang; Fei-peng Wu

doi:10.1007/s10118-012-1104-8

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ASSOCIATION BEHAVIOR OF PORPHYRIN PENDANTS IN pH-SENSITIVE WATER-SOLUBLE POLYMER

Paper | Updated：2023-01-03

- ASSOCIATION BEHAVIOR OF PORPHYRIN PENDANTS IN pH-SENSITIVE WATER-SOLUBLE POLYMER
- Chinese Journal of Polymer Science Vol. 30, Issue 1, Pages: 63-71(2012)
- Affiliations：
  
  a.Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China,
  b.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  *Fei-peng Wu (吴飞鹏), E-mail: fpwu@mail.ipc.ac.cn
- Funds：
- DOI：10.1007/s10118-012-1104-8
  CLC：
- Received：26 January 2011，
  
  Revised：2011-03-16，
  
  Accepted：17 March 2011，
  
  Published：2012-01
- Accepted：
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Ke-wei Ding, Fei Wang, Fei-peng Wu. ASSOCIATION BEHAVIOR OF PORPHYRIN PENDANTS IN pH-SENSITIVE WATER-SOLUBLE POLYMER[J]. Chinese Journal of Polymer Science, 2012, 30(1): 63-71.
DOI：

Ke-wei Ding, Fei Wang, Fei-peng Wu. ASSOCIATION BEHAVIOR OF PORPHYRIN PENDANTS IN pH-SENSITIVE WATER-SOLUBLE POLYMER[J]. Chinese Journal of Polymer Science, 2012, 30(1): 63-71. DOI： 10.1007/s10118-012-1104-8.

摘要

Abstract

A novel tripyridylporphyrin monomer

5-[4-[2-(acryloyloxy)ethoxy]phenyl]-l0

20-tris(4-pyridyl)porphyrin (TrPyP)

was synthesized and polymerized with acrylamide (AM) to prepare the hydrophobically associating water-soluble polymer PAM-TrPyP. The aggregation behavior of porphyrin pendants was investigated by UV-Visible and fluorescence spectra. The polymer displays a strong tendency of hydrophobic association even in dilute solutions. With increasing the concentration

the maximum absorption wavelength of Soret band changes from 416 nm to 407 nm

and the fluorescence corrected for the inner filter effect exhibits moderate concentration quenching. All the results indicate that π-π interaction of porphyrin pendants plays a key role in association of PAM-TrPyP

and H-aggregates of porphyrins are mainly formed in the concentrated solution. On the other hand

dynamic light scattering (DLS) and transmission electron microscopy (TEM) were used to follow the changes in size and structure of the macromolecular assemblies with the concentration increase. The polymer aggregation conformation changes from loose "vesicle-like" morphology to solid globule accordingly. When pH value of solution decreases to 4.3

pyridine moieties on porphyrin pendants could be protonated and the H-aggregates formed in macromolecular matrix are destroyed by electrostatic repulsion interactions.

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