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Effect of zinc substitution on molecular dynamics of protoporphyrin-IX

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Abstract

We report the effects of zinc metal substitution on the molecular dynamics of protoporphyrin-IX in dichloromethane solvent by spectrally resolving the femtosecond photon echo spectrum. We have found that the coherence and population dynamics change due to the presence of Zn metal in the protoporphyrin-IX system. Zinc metal reduces the conformational disorder in the molecular structure of protoporphyrin-IX and in turn increases the planarity of the molecule resulting in better delocalization of π-electrons in the system. This effect decreases the inhomogeneous broadening of the photon echo spectra of Zn-substituted protoporphyrin-IX.

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Acknowledgments

D.G. thanks the support from the Department of Science and Technology (DST) Swarnajayanti Fellowship, Indian Space Research Organization (ISRO) Space Technology Cell funds, and Ministry of Human Resource Development (Govt. of India) for funding this research. A.K. acknowledges Council of Scientific and Industrial Research (CSIR), India, for graduate fellowship.

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  1. Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    A. Kumar & D. Goswami

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  1. A. Kumar
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  2. D. Goswami
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Correspondence to D. Goswami.

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Kumar, A., Goswami, D. Effect of zinc substitution on molecular dynamics of protoporphyrin-IX. Indian J Phys 89, 1183–1192 (2015). https://doi.org/10.1007/s12648-015-0689-5

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