Influence of the energy of charge transfer on non-covalent interactions between fullerenes and a designed bisporphyrin

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Debabrata PalSumanta Bhattacharya

Abstract

The present paper reports the spectroscopic and theoretical investigations on the formation of supramolecular complexes of a designed bisporphyrin (1) with C(60) and C(70) in toluene. Absorption spectrophotometric studies establish appreciable amount of ground state electronic interaction between fullerenes and 1. The interaction is facilitated through charge transfer (CT) transition as evidenced from well defined CT absorption bands in the visible region of the electronic spectra. In our present case, the CT interaction may be claimed as one of the rare findings, especially on account of interaction between fullerenes and bisporphyrin in a non-polar solvent. Other than fullerenes C(60) and C(70), various other electron acceptors, viz., 2,3-dichloro-5,6-dicyano-p-benzoquinone, tetracyanoethylene, o-chloranil and p-chloranil form CT complexes with 1. Utilizing the CT transition energies for various electron donor-acceptor complexes of 1, vertical ionization potential (I(D)(v)) of 1 is determined to be 6.37 eV in solution. Estimation of degrees of CT, oscillator and transition dipole strengths evoke that the fullerene-1 non-covalent complexes are of neutral character in ground state. Higher magnitude of electronic coupling elemen...Continue Reading

References

Jul 12, 2001·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·S BhattacharyaA K Mukherjee
Jan 5, 2002·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·S BhattacharyaA K Mukherjee
Jan 26, 2002·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Sumanta BhattacharyaAsok K Mukherjee
Feb 27, 2007·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Sumanta BhattacharyaNaoki Komatsu
Mar 6, 2007·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Sumanta BhattacharyaManas Banerjee
Oct 16, 2010·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Debabrata PalSumanta Bhattacharya
Jun 7, 2011·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·A RayS Bhattacharya

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