Home
Resources
Publications
Spectroscopic Characterization of Tetracationic Porphyrins and Their Noncovalent Functionalization With Graphene

Spectroscopic Characterization of Tetracationic Porphyrins and Their Noncovalent Functionalization With Graphene

Ting-xiu Ye, Shu-lan Ye, Dong-mei Chen, Qing-ai Chen, Bin Qiu, Xi Chen

Spectrochim Acta A Mol Biomol Spectrosc. 2012 Feb;86:467-71.

PMID: 22119123

Abstract:

In this study, the noncovalent functionalization of graphene with cationic porphyrins in an aqueous medium was investigated using UV-vis and fluorescence approaches. To characterize the interaction between graphene and cationic porphyrins, 5,10,15,20-tetra (4-pyridyl)-21H,23H-porphine, 5,10,15,20-tetrakis (1-methyl-4-pyridinio) porphyrin tetra (p-toluenesulfonate) and 5,10,15,20-tetrakis (4-trimethylammoniophenyl) porphyrin tetra (p-toluenesulfonate) porphyrin were chosen as reagents. The intermolecular interactions were found to occur immediately after mixing the cationic porphyrins with graphene. The absorption spectra of the cationic porphyrins after mixing with graphene showed distinct red shifts of the Soret and Q-bands compared to free cationic porphyrins indicating that interactions occur between the cationic porphyrins and graphene. A strong fluorescence quenching of the cationic porphyrins in the presence of graphene indicated that efficient electron or energy transfer occurred from the excited state of the cationic porphyrins to graphene. Cationic porphyrins were immobilized on the surface of graphene through electrostatic and π-π stacking interactions, and the chemical shape of graphene played an important role in the intermolecular interactions and the red shift extent of cationic porphyrins is mostly dependent on the functional groups and charges of the graphene surface. The results show that less functional groups on the graphene's surface and edge would lead to stronger π-π stacking interactions between graphene and cationic porphyrins.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP16834132	5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphine		16834-13-2	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: