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Polarized Total-Reflection X-ray Absorption Fine Structure of Zinc(II) Porphyrin at the Heptane−Water Interface
- Source :
- The Journal of Physical Chemistry C. 114:18583-18587
- Publication Year :
- 2010
- Publisher :
- American Chemical Society (ACS), 2010.
-
Abstract
- The polarized total-reflection X-ray absorption fine structure (TR-XAFS) method was applied in situ to the liquid−liquid interface. The TR-XAFS spectrum at the Zn K-edge for 5,10,15,20-tetrakis(4-carboxypheny)porphyrinato zinc(II) (ZnTPPC4−) adsorbed at the heptane−water interface exhibited a spectral difference depending on the linear polarization of the incident X-ray. The 1s−4pz transition response for a square planar zinc(II) complex was observed in the pre-edge region (9662 eV) only with a vertically polarized X-ray. The appearance of the transition response indicates that the axial coordination sites of the zinc center tend to be partially dehydrated at the heptane−water interface. The polarization dependence of the TR-XAFS spectrum demonstrated that the porphyrin macrocycle orients almost in the interfacial plane similar to ZnTPPC at the air−water interface. Polarized TR-XAFS measurement was also carried out in the presence of a cationic surfactant, hexyltrimethylammonium bromide (C6TAB), in the aq...
- Subjects :
- Heptane
Total internal reflection
Linear polarization
Analytical chemistry
chemistry.chemical_element
Zinc
Porphyrin
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
X-ray absorption fine structure
Crystallography
chemistry.chemical_compound
General Energy
chemistry
Physical and Theoretical Chemistry
Absorption (chemistry)
Polarization (electrochemistry)
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 114
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi.dedup.....7bd60deacc4774c2285337d98c129365