Front Cover: Synthesis and Binding Studies of a Tetra-α Aryl-Extended Photoresponsive Calix[4]pyrrole Receptor Bearing meso-Alkyl Substituents (Eur. J. Org. Chem. /2018)

Luis Escobar, Frank A. Arroyave, Pablo Ballester

Index: 10.1002/ejoc.201800173

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Abstract

The Front Cover shows two isomeric tetraazobenzene calix[4]pyrroles with a bound guest. The all-trans complex (lower left) is exclusively obtained after thermal equilibration. The biphenyl unit of the bound guest is fully included in the aromatic cavity of the all-trans receptor. Light irradiation produced a mixture of cis-enriched counterparts. At the photostationary state, the all-cis complex (upper right) accounts for more than 80 % of the mixture. In this complex, the terminal phenyl substituent of the included guest is totally exposed to the bulk solution. More information can be found in the Full Paper by P. Ballester et al.