Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces
KAUST DepartmentKAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
Chemical Science Program
MetadataShow full item record
AbstractWe report on the ultrafast interfacial electron transfer ( ET) between zinc( II) porphyrin ( ZnTMPyP) and negatively charged graphene carboxylate ( GC) using state- of- the- art femtosecond laser spectroscopy with broadband capabilities. The steady- state interaction between GC and ZnTMPyP results in a red- shifted absorption spectrum, providing a clear indication for the binding affinity between ZnTMPyP and GC via electrostatic and p- p stacking interactions. Ultrafast transient absorption ( TA) spectra in the absence and presence of three different GC concentrations reveal ( i) the ultrafast formation of singlet excited ZnTMPyP*, which partially relaxes into a long- lived triplet state, and ( ii) ET from the singlet excited ZnTMPyP* to GC, forming ZnTMPyP + and GC , as indicated by a spectral feature at 650- 750 nm, which is attributed to a ZnTMPyP radical cation resulting from the ET process.
PublisherRoyal Society of Chemistry (RSC)
JournalPhys. Chem. Chem. Phys.
- Z-form DNA specific binding geometry of Zn(II) meso-tetrakis(N-methylpyridinium-4-yl)porphyrin probed by linear dichroism spectroscopy.
- Authors: Gong L, Jang YJ, Kim J, Kim SK
- Issue date: 2012 Aug 16
- Ultrafast electron injection at the cationic porphyrin-graphene interface assisted by molecular flattening.
- Authors: Aly SM, Parida MR, Alarousu E, Mohammed OF
- Issue date: 2014 Sep 18
- Femtosecond time- and wavelength-resolved fluorescence and absorption spectroscopic study of the excited states of adenosine and an adenine oligomer.
- Authors: Kwok WM, Ma C, Phillips DL
- Issue date: 2006 Sep 13
- Ultrafast fluorescence detection in tris(2,2'-bipyridine)ruthenium(II) complex in solution: relaxation dynamics involving higher excited states.
- Authors: Bhasikuttan AC, Suzuki M, Nakashima S, Okada T
- Issue date: 2002 Jul 17