Construction of Novel Cyclic Tetrads by Axial Coordination of Thiaporphyrins to Tin(IV) Porphyrin

A. Alka, Yogita Pareek, Vijayendra S. Shetti, M. Rajeswara Rao, Gregory G. Theophall, Way Zen Lee, K. V. Lakshmi, M. Ravikanth

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report the formation of new cyclic porphyrin tetrads 1 and 2, which were obtained from the reaction between dihydroxytin(IV) porphyrin and cis-dihydroxy-21-thiaporphyrin/21,23-dithiaporphyrin. The unique oxophilicity of tin(IV) porphyrin was the driving force for the formation of these tetrads. Moreover, these novel tetrads represent the first examples of cyclic porphyrins containing tin(IV) that are constructed exclusively on the basis of the "Sn-O" interaction without any other complementary, noncompetitive mode of interactions. The molecular structures of the cyclic tetrads have been investigated by matrix-assisted laser desorption ionization time-of-flight mass spectrometry, NMR spectroscopy, quantum-mechanical calculations, and, in one case, single-crystal X-ray crystallography. The X-ray structure revealed that the two cis-dihydroxy-N2S2 porphyrins were coordinated at the axial positions of two tin(IV) porphyrins, leading to the symmetric cyclic tetrad structure. The optical properties of tetrads were studied, and these compounds were stable under redox conditions. Preliminary photophysical studies carried out on the tetrads indicated efficient energy transfer from tin(IV) porphyrin to the thiaporphyrin unit, which highlights their potential applications in energy and electron transfer in the future.

Original languageEnglish
Pages (from-to)13913-13929
Number of pages17
JournalInorganic Chemistry
Volume56
Issue number22
DOIs
Publication statusPublished - 2017 Nov 20

    Fingerprint

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Alka, A., Pareek, Y., Shetti, V. S., Rajeswara Rao, M., Theophall, G. G., Lee, W. Z., Lakshmi, K. V., & Ravikanth, M. (2017). Construction of Novel Cyclic Tetrads by Axial Coordination of Thiaporphyrins to Tin(IV) Porphyrin. Inorganic Chemistry, 56(22), 13913-13929. https://doi.org/10.1021/acs.inorgchem.7b01966