Surface-Enhanced Resonance Raman Spectra Study of α,β,γ,δ-Tetra-(4-Trimethyl Ammonium Phenyl) Porphyrin

1993 ◽  
Vol 47 (3) ◽  
pp. 292-295 ◽  
Author(s):  
Jian Chen ◽  
Ji-Ming Hu ◽  
Zhi-San Xu ◽  
Rong-Sheng Sheng

In the present study, surface-enhanced resonance Raman scattering (SERRS) spectra of α,β,γ,δ-tetra-(4-trimethyl ammonium phenyl) porphyrin [T(4-TAP)P] were obtained. With increasing pH, the relative intensities of the bands at 890 and 1244 cm−1 decreased. These bands were attributed to γ(C-H) and δ(Cm-phenyl), respectively. The bands at 420 and 576 cm−1, which were assigned to γ(phenyl-ring), were enhanced. The molecular symmetry of T(4-TAP)P is discussed in terms of group theory. The bands at 1554 and 1496 cm−1 could be attributed to the vibrational modes of the porphyrin macrocycle; the bands at 1460, 1362, and 1330 cm−1 were assigned to ν(C-C) + δ(C-H), ν(C-N) + δ(C-H), and ν(C-N), respectively. All these bands change in band intensities, positions and widths, with the potential changing from +0.2 V to −0.2 V. It was concluded that the adsorbed porphyrins underwent partial incorporation with Ag from the electrode, and the adsorbate assumed a flat orientation on the silver electrode as well as the Ag colloid surface.

The Analyst ◽  
2015 ◽  
Vol 140 (17) ◽  
pp. 6145-6146 ◽  
Author(s):  
A. Feis ◽  
G. Smulevich

We contrast recently reported surface-enhanced resonance Raman spectra (SERRS) of myoglobin on silver nanoparticles with established knowledge about this complex.


1999 ◽  
Vol 19 (1-4) ◽  
pp. 311-316 ◽  
Author(s):  
Susan M. Tavender ◽  
Steven A. Johnson ◽  
Daniel Balsom ◽  
Anthony W. Parker ◽  
Roger H. Bisby

The carbonate radical (Co3−·) is of biological significance acting as an intermediate in free radical-mediated damage and is capable of oxidising amino acids and proteins. In order to distinguish between the four possible structures of Co3−·, nanosecond timeresolved resonance Raman (TR3) experiments were undertaken. Photolysis of persulphate at 250 nm generated the So4−· radical which then oxidised sodium carbonate. Resonance Raman spectra of the resulting Co3−· radical were obtained using a probe wavelength of 620 nm. Point group theory calculations and interpretation of the TR3 spectra suggest that the radical has C2v molecular symmetry.


2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
N. N. Syrbu ◽  
A. V. Tiron ◽  
V. V. Zalamai ◽  
N. P. Bejan

The resonance Raman scattering for geometries Y(YX)Z and Y(ZX)Z at temperature 10 K and infrared reflection spectra in E∥a and E∥b polarizations at 300 K were investigated. The number of Aa (Ba) and Au (Bu) symmetry vibrational modes observed experimentally and calculated theoretically agree better in this case than when TlGa2Se4 crystals belong to D2h symmetry group. The emission of resonance Raman scattering and excitonic levels luminescence spectra overlap. The lines in resonance Raman spectra were identified as a combination of optical phonons in Brillouin zone center.


2001 ◽  
Vol 105 (15) ◽  
pp. 3673-3679 ◽  
Author(s):  
C. Eggeling ◽  
J. Schaffer ◽  
C. A. M. Seidel ◽  
J. Korte ◽  
G. Brehm ◽  
...  

2006 ◽  
Vol 789 (1-3) ◽  
pp. 59-70 ◽  
Author(s):  
Prokopis C. Andrikopoulos ◽  
Karen M. McCarney ◽  
David R. Armstrong ◽  
Rachael E. Littleford ◽  
Duncan Graham ◽  
...  

ChemInform ◽  
2010 ◽  
Vol 29 (40) ◽  
pp. no-no
Author(s):  
D. GRAHAM ◽  
C. MCLAUGHLIN ◽  
G. MCANALLY ◽  
J. C. JONES ◽  
P. C. WHITE ◽  
...  

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