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Solid state photodimerization in an organic salt of 1,2-bis(4-pyridyl)ethylene and trifluoromethane sulphonic acid via pedal-like motion

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Abstract

A novel organic salt, [bpeH].TFMS (1), of trans-1,2-bis(4-pyridyl)ethylene (bpe) was synthesized using trifluoromethane sulphonic acid (\(\hbox {CF}_{3}\hbox {SO}_{3}\hbox {H}\), TFMS) by self-assembly and its crystal structure was determined by X-ray crystallography. Compound 1 forms hydrogen-bonded assembly of [bpeH]\(^{+}\) cations and \(\hbox {CF}_{3}\hbox {SO}_{3}^{-}\) anions which are held together by N–H\({\cdots }\)N, C–H\({\cdots }\)O and C–H\({\cdots }\)F hydrogen-bonding interactions. An attempt has been made to orient the olefinic C=C bonds of bpe in the organic salt via weak hydrogen-bonding interaction for photodimerization reaction in the solid state. The \([\hbox {bpeH}]^{+}\) cations are in parallel orientation in the infinite one dimensional (1D) chain through N–H\({\cdots }\)N hydrogen bonding. The olefinic C=C bonds of bpe are aligned in criss-cross orientation with a center-to-center distance of 4.97 Å. Even though the distance and the orientation of olefinic C=C bonds do not conform with the Schmidt topochemical criteria, compound 1 undergoes photodimerization reaction in solid state to produce stereo-specific rctt-tetrakis(4-pyridyl)cyclobutane (rctt-tpcb) (2) in 100% yield. The photoreactivity is expected to take place through cooperative movement of 1D chains and pedal-like motion of the pyridyl rings over the double bonds. The photodimerized product 2 undergoes acid-catalyzed isomerization to produce other cyclobutane isomers such as rcct-tpcb and rtct-tpcb. This strategy for synthesizing organic salts is a facile step for the synthesis of cyclobutane derivatives.

Graphical Abstract

SYNOPSIS A novel organic salt of trans-1,2-bis(4-pyridyl)ethylene and trifluoromethane sulphonic acid was characerized by X-ray crystallography. The salt shows unusual photoreactivity via pedal-like motion of C=C double bonds which change from criss-cross to parallel orientation. The photodimerized product undergoes acid-catalyzed isomerization in solution and produces all the isomers of tetrakis(4-pyridyl)cyclobutane.

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Acknowledgements

The author would like to acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum and Minerals (KFUPM) for funding this work through Project No. IN131005. The author is grateful to Prof. J. J. Vittal (National University of Singapore), Dr. M. B. Fettouhi and Dr. T. F. Garrison (King Fahd University of Petroleum and Minerals) for helpful discussions.

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Correspondence to Abdul Malik P Peedikakkal.

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Peedikakkal, A.M.P. Solid state photodimerization in an organic salt of 1,2-bis(4-pyridyl)ethylene and trifluoromethane sulphonic acid via pedal-like motion. J Chem Sci 129, 733–739 (2017). https://doi.org/10.1007/s12039-017-1300-8

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