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A new core expanded calix[4]pyrrole is reported, in which the opposite bridging sp3-carbons are replaced by ethylene moieties. This macrocycle forms a unique helical pattern and binds to two water molecules, forming an infinite 1D chain synergistically stabilized through hydrogen bonding with the two outwardly projected pyrrolic NHs of the calixpyrrole.
![Graphical abstract: 1D water chain stabilized by meso-expanded calix[4]pyrrole](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C4CE01502A&imageInfo.ImageIdentifier.Year=2014)
B. Sathish Kumar and P. K. Panda, CrystEngComm, 2014, 16, 8669 DOI: 10.1039/C4CE01502A
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